From 4342a97c9e221ed5c7373ef746f600cc25b18ab4 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Thu, 22 Dec 2022 14:30:39 +0100
Subject: [PATCH 01/85] Start with writing a test

---
 .../test/Hydra/Chain/Direct/Contract/Close.hs   | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index 0fc12730cb8..494c9fcb48a 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -10,7 +10,7 @@ import Hydra.Prelude hiding (label)
 import Cardano.Api.UTxO as UTxO
 import Cardano.Binary (serialize')
 import Data.Maybe (fromJust)
-import Hydra.Chain.Direct.Contract.Mutation (Mutation (..), SomeMutation (..), addParticipationTokens, changeHeadOutputDatum, genHash)
+import Hydra.Chain.Direct.Contract.Mutation (Mutation (..), SomeMutation (..), addParticipationTokens, changeHeadOutputDatum, genHash, headTxIn)
 import Hydra.Chain.Direct.Fixture (genForParty, testNetworkId, testPolicyId)
 import Hydra.Chain.Direct.Tx (ClosingSnapshot (..), OpenThreadOutput (..), UTxOHash (UTxOHash), closeTx, mkHeadOutput)
 import Hydra.ContestationPeriod (fromChain)
@@ -143,10 +143,11 @@ data CloseMutation
   | MutateValidityInterval
   | MutateCloseContestationDeadline
   | MutateCloseContestationDeadlineWithZero
+  | MutateInputs
   deriving (Generic, Show, Enum, Bounded)
 
 genCloseMutation :: (Tx, UTxO) -> Gen SomeMutation
-genCloseMutation (tx, _utxo) =
+genCloseMutation (tx, utxo) =
   -- FIXME: using 'closeRedeemer' here is actually too high-level and reduces
   -- the power of the mutators, we should test at the level of the validator.
   -- That is, using the on-chain types. 'closeRedeemer' is also not used
@@ -191,6 +192,18 @@ genCloseMutation (tx, _utxo) =
         lb <- arbitrary
         ub <- (lb -) <$> choose (0, lb)
         pure (TxValidityLowerBound (SlotNo lb), TxValidityUpperBound (SlotNo ub))
+    , SomeMutation MutateInputs <$> do
+        let out = case txOuts $ txBodyContent $ txBody tx of
+              [] -> error "empty txOut"
+              (o : _) -> o
+        let (Tx body _) = tx
+        let ShelleyTxBody _ scripts _ _ _ = body
+        let _script =
+              case scripts of
+                [] -> Nothing
+                (s : _) -> Just s
+
+        pure $ Changes [ChangeInput (headTxIn utxo) (toUTxOContext out) Nothing]
     ]
  where
   headTxOut = fromJust $ txOuts' tx !!? 0

From 5b3e0ac0b4d541e5ac8254ab801e98f2c3c7080e Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Thu, 22 Dec 2022 14:51:57 +0100
Subject: [PATCH 02/85] Refactor mutation in the Abort

---
 .../test/Hydra/Chain/Direct/Contract/Abort.hs | 60 +++++++++++--------
 .../test/Hydra/Chain/Direct/Contract/Close.hs | 17 +-----
 2 files changed, 37 insertions(+), 40 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
index cd957d64ade..09a069f938f 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
@@ -168,32 +168,42 @@ genAbortMutation (tx, utxo) =
     , SomeMutation UseInputFromOtherHead <$> do
         (input, output, _) <- elements healthyInitials
         otherHeadId <- fmap headPolicyId (arbitrary `suchThat` (/= testSeedInput))
-
-        let value = txOutValue output
-            assetNames =
-              [ (policyId, pkh) | (AssetId policyId pkh, _) <- valueToList value, policyId == testPolicyId
-              ]
-            (originalPolicyId, assetName) =
-              case assetNames of
-                [assetId] -> assetId
-                _ -> error "expected one assetId"
-
-            newValue = headValue <> valueFromList [(AssetId otherHeadId assetName, 1)]
-
-            ptForAssetName = \case
-              (AssetId pid asset, _) ->
-                pid == originalPolicyId && asset == assetName
-              _ -> False
-
-            mintedValue' = case txMintValue $ txBodyContent $ txBody tx of
-              TxMintValueNone -> error "expected minted value"
-              TxMintValue v _ -> valueFromList $ filter (not . ptForAssetName) $ valueToList v
-
-            output' = output{txOutValue = newValue}
-
         pure $
           Changes
-            [ ChangeInput input output' (Just $ toScriptData Initial.ViaAbort)
-            , ChangeMintedValue mintedValue'
+            [ ChangeInput input (replacePolicyIdWith otherHeadId output) (Just $ toScriptData Initial.ViaAbort)
+            , ChangeMintedValue (removePTFromMintedValue output tx)
             ]
     ]
+
+removePTFromMintedValue :: TxOut CtxUTxO -> Tx -> Value
+removePTFromMintedValue output tx =
+  let value = txOutValue output
+      assetNames =
+        [ (policyId, pkh) | (AssetId policyId pkh, _) <- valueToList value, policyId == testPolicyId
+        ]
+      (originalPolicyId, assetName) =
+        case assetNames of
+          [assetId] -> assetId
+          _ -> error "expected one assetId"
+
+      ptForAssetName = \case
+        (AssetId pid asset, _) ->
+          pid == originalPolicyId && asset == assetName
+        _ -> False
+   in case txMintValue $ txBodyContent $ txBody tx of
+        TxMintValueNone -> error "expected minted value"
+        TxMintValue v _ -> valueFromList $ filter (not . ptForAssetName) $ valueToList v
+
+replacePolicyIdWith :: PolicyId -> TxOut CtxUTxO -> TxOut CtxUTxO
+replacePolicyIdWith otherHeadId output =
+  let value = txOutValue output
+      assetNames =
+        [ (policyId, pkh) | (AssetId policyId pkh, _) <- valueToList value, policyId == testPolicyId
+        ]
+      (_originalPolicyId, assetName) =
+        case assetNames of
+          [assetId] -> assetId
+          _ -> error "expected one assetId"
+
+      newValue = headValue <> valueFromList [(AssetId otherHeadId assetName, 1)]
+   in output{txOutValue = newValue}
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index 494c9fcb48a..0fc12730cb8 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -10,7 +10,7 @@ import Hydra.Prelude hiding (label)
 import Cardano.Api.UTxO as UTxO
 import Cardano.Binary (serialize')
 import Data.Maybe (fromJust)
-import Hydra.Chain.Direct.Contract.Mutation (Mutation (..), SomeMutation (..), addParticipationTokens, changeHeadOutputDatum, genHash, headTxIn)
+import Hydra.Chain.Direct.Contract.Mutation (Mutation (..), SomeMutation (..), addParticipationTokens, changeHeadOutputDatum, genHash)
 import Hydra.Chain.Direct.Fixture (genForParty, testNetworkId, testPolicyId)
 import Hydra.Chain.Direct.Tx (ClosingSnapshot (..), OpenThreadOutput (..), UTxOHash (UTxOHash), closeTx, mkHeadOutput)
 import Hydra.ContestationPeriod (fromChain)
@@ -143,11 +143,10 @@ data CloseMutation
   | MutateValidityInterval
   | MutateCloseContestationDeadline
   | MutateCloseContestationDeadlineWithZero
-  | MutateInputs
   deriving (Generic, Show, Enum, Bounded)
 
 genCloseMutation :: (Tx, UTxO) -> Gen SomeMutation
-genCloseMutation (tx, utxo) =
+genCloseMutation (tx, _utxo) =
   -- FIXME: using 'closeRedeemer' here is actually too high-level and reduces
   -- the power of the mutators, we should test at the level of the validator.
   -- That is, using the on-chain types. 'closeRedeemer' is also not used
@@ -192,18 +191,6 @@ genCloseMutation (tx, utxo) =
         lb <- arbitrary
         ub <- (lb -) <$> choose (0, lb)
         pure (TxValidityLowerBound (SlotNo lb), TxValidityUpperBound (SlotNo ub))
-    , SomeMutation MutateInputs <$> do
-        let out = case txOuts $ txBodyContent $ txBody tx of
-              [] -> error "empty txOut"
-              (o : _) -> o
-        let (Tx body _) = tx
-        let ShelleyTxBody _ scripts _ _ _ = body
-        let _script =
-              case scripts of
-                [] -> Nothing
-                (s : _) -> Just s
-
-        pure $ Changes [ChangeInput (headTxIn utxo) (toUTxOContext out) Nothing]
     ]
  where
   headTxOut = fromJust $ txOuts' tx !!? 0

From e27e8d4ae4a6f2844563d17df1a24f657eb74b7a Mon Sep 17 00:00:00 2001
From: Arnaud Bailly <arnaud.bailly@iohk.io>
Date: Thu, 22 Dec 2022 14:35:26 +0000
Subject: [PATCH 03/85] Mutate policy id of PT in commit transaction

---
 .../test/Hydra/Chain/Direct/Contract/Abort.hs | 16 +---------
 .../Hydra/Chain/Direct/Contract/Commit.hs     | 30 ++++++++++++++-----
 .../Hydra/Chain/Direct/Contract/Mutation.hs   | 11 +++++++
 3 files changed, 34 insertions(+), 23 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
index 09a069f938f..c9e937ab28e 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
@@ -19,6 +19,7 @@ import Hydra.Chain.Direct.Contract.Mutation (
   anyPayToPubKeyTxOut,
   changeMintedValueQuantityFrom,
   headTxIn,
+  replacePolicyIdWith,
  )
 import Hydra.Chain.Direct.Fixture (genForParty, testNetworkId, testPolicyId, testSeedInput)
 import Hydra.Chain.Direct.ScriptRegistry (genScriptRegistry, registryUTxO)
@@ -26,7 +27,6 @@ import Hydra.Chain.Direct.Tx (
   UTxOWithScript,
   abortTx,
   headPolicyId,
-  headValue,
   mkHeadOutputInitial,
   mkHeadTokenScript,
  )
@@ -193,17 +193,3 @@ removePTFromMintedValue output tx =
    in case txMintValue $ txBodyContent $ txBody tx of
         TxMintValueNone -> error "expected minted value"
         TxMintValue v _ -> valueFromList $ filter (not . ptForAssetName) $ valueToList v
-
-replacePolicyIdWith :: PolicyId -> TxOut CtxUTxO -> TxOut CtxUTxO
-replacePolicyIdWith otherHeadId output =
-  let value = txOutValue output
-      assetNames =
-        [ (policyId, pkh) | (AssetId policyId pkh, _) <- valueToList value, policyId == testPolicyId
-        ]
-      (_originalPolicyId, assetName) =
-        case assetNames of
-          [assetId] -> assetId
-          _ -> error "expected one assetId"
-
-      newValue = headValue <> valueFromList [(AssetId otherHeadId assetName, 1)]
-   in output{txOutValue = newValue}
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
index a31d24c1d56..d963e686e74 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
@@ -13,8 +13,10 @@ import Data.Maybe (fromJust)
 import Hydra.Chain.Direct.Contract.Mutation (
   Mutation (..),
   SomeMutation (..),
+  replacePolicyIdWith
  )
 import qualified Hydra.Chain.Direct.Fixture as Fixture
+import qualified Hydra.Contract.Initial  as Initial
 import Hydra.Chain.Direct.ScriptRegistry (genScriptRegistry, registryUTxO)
 import Hydra.Chain.Direct.Tx (commitTx, headPolicyId, mkInitialOutput)
 import Hydra.Ledger.Cardano (
@@ -48,19 +50,22 @@ healthyCommitTx =
 
   scriptRegistry = genScriptRegistry `generateWith` 42
 
-  initialInput = generateWith arbitrary 42
+  initialPubKeyHash = verificationKeyHash commitVerificationKey
 
-  initialOutput = mkInitialOutput Fixture.testNetworkId policyId commitVerificationKey
+  commitParty :: Party
+  commitParty = generateWith arbitrary 42
 
-  policyId = headPolicyId initialInput
+commitVerificationKey :: VerificationKey PaymentKey
+commitVerificationKey = generateWith arbitrary 42
 
-  initialPubKeyHash = verificationKeyHash commitVerificationKey
+initialInput :: TxIn
+initialInput = generateWith arbitrary 42
 
-  commitVerificationKey :: VerificationKey PaymentKey
-  commitVerificationKey = generateWith arbitrary 42
+initialOutput :: TxOut CtxTx
+initialOutput = mkInitialOutput Fixture.testNetworkId policyId commitVerificationKey
 
-  commitParty :: Party
-  commitParty = generateWith arbitrary 42
+policyId :: PolicyId
+policyId = headPolicyId initialInput
 
 -- NOTE: An 8₳ output which is currently addressed to some arbitrary key.
 healthyCommittedUTxO :: (TxIn, TxOut CtxUTxO)
@@ -74,6 +79,9 @@ data CommitMutation
   | MutateCommittedValue
   | MutateCommittedAddress
   | MutateRequiredSigner
+  | -- | Change the policy Id of the PT both in input and output
+    MutatePolicyId
+
   deriving (Generic, Show, Enum, Bounded)
 
 genCommitMutation :: (Tx, UTxO) -> Gen SomeMutation
@@ -94,6 +102,12 @@ genCommitMutation (tx, _utxo) =
     , SomeMutation MutateRequiredSigner <$> do
         newSigner <- verificationKeyHash <$> genVerificationKey
         pure $ ChangeRequiredSigners [newSigner]
+    , SomeMutation MutatePolicyId <$> do
+        otherHeadId <- fmap headPolicyId (arbitrary `suchThat` (/= Fixture.testSeedInput))
+        pure $ Changes [ ChangeOutput 0 (replacePolicyIdWith otherHeadId commitTxOut)
+                       , ChangeInput initialInput (toUTxOContext $ replacePolicyIdWith otherHeadId initialOutput) (Just $ toScriptData $ Initial.ViaCommit $ Just $ toPlutusTxOutRef (fst healthyCommittedUTxO))
+                       ]
+
     ]
  where
   TxOut{txOutValue = commitOutputValue} = commitTxOut
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
index 1e0c7fa3006..5e9ad279fd7 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
@@ -572,3 +572,14 @@ addPTWithQuantity tx quantity =
         pure mempty
  where
   mintedValue = txMintValue $ txBodyContent $ txBody tx
+
+replacePolicyIdWith :: PolicyId -> TxOut a -> TxOut a
+replacePolicyIdWith otherHeadId output =
+  let value = txOutValue output
+      newValue =
+        valueFromList $ map (swapPolicyId) $ valueToList value
+      swapPolicyId = \case
+        (AssetId policyId pkh, q)
+          | policyId == testPolicyId ->  (AssetId otherHeadId pkh, q)
+        v -> v
+   in output{txOutValue = newValue}

From b073d14e5b142b5c4401b1ee110321951ebb2605 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Thu, 22 Dec 2022 16:57:52 +0100
Subject: [PATCH 04/85] Introduce datum for the intial validator

---
 .../src/Hydra/Cardano/Api/Value.hs            |  8 ++++-
 hydra-node/src/Hydra/Chain/Direct/State.hs    |  5 ++--
 hydra-node/src/Hydra/Chain/Direct/Tx.hs       | 11 ++++---
 .../Hydra/Chain/Direct/Contract/Commit.hs     | 19 +++++++-----
 hydra-node/test/Hydra/Chain/Direct/TxSpec.hs  |  3 +-
 hydra-plutus/src/Hydra/Contract/Initial.hs    | 30 ++++++++++++-------
 6 files changed, 50 insertions(+), 26 deletions(-)

diff --git a/hydra-cardano-api/src/Hydra/Cardano/Api/Value.hs b/hydra-cardano-api/src/Hydra/Cardano/Api/Value.hs
index cc61e9f280c..56f5f278c06 100644
--- a/hydra-cardano-api/src/Hydra/Cardano/Api/Value.hs
+++ b/hydra-cardano-api/src/Hydra/Cardano/Api/Value.hs
@@ -9,7 +9,7 @@ import Hydra.Cardano.Api.CtxUTxO (ToUTxOContext (..))
 import Hydra.Cardano.Api.Hash (unsafeScriptHashFromBytes)
 import Hydra.Cardano.Api.MultiAssetSupportedInEra (multiAssetSupportedInEra)
 import Plutus.V1.Ledger.Value (flattenValue)
-import Plutus.V2.Ledger.Api (adaSymbol, adaToken, fromBuiltin, unCurrencySymbol, unTokenName)
+import Plutus.V2.Ledger.Api (CurrencySymbol, adaSymbol, adaToken, fromBuiltin, unCurrencySymbol, unTokenName)
 import qualified Plutus.V2.Ledger.Api as Plutus
 
 -- * Extras
@@ -96,3 +96,9 @@ fromPlutusValue plutusValue =
 toPlutusValue :: Value -> Plutus.Value
 toPlutusValue =
   Ledger.transValue . toLedgerValue
+
+toPlutusPolicyId :: PolicyId -> CurrencySymbol
+toPlutusPolicyId = Ledger.transPolicyID . toLedgerPolicyID
+
+toLedgerPolicyID :: PolicyId -> Ledger.PolicyID StandardCrypto
+toLedgerPolicyID (PolicyId sh) = Ledger.PolicyID (toShelleyScriptHash sh)
diff --git a/hydra-node/src/Hydra/Chain/Direct/State.hs b/hydra-node/src/Hydra/Chain/Direct/State.hs
index d37013a9bc1..599089d33b3 100644
--- a/hydra-node/src/Hydra/Chain/Direct/State.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/State.hs
@@ -295,9 +295,9 @@ commit ctx st utxo = do
       case UTxO.pairs utxo of
         [aUTxO] -> do
           rejectByronAddress aUTxO
-          Right $ commitTx scriptRegistry networkId ownParty (Just aUTxO) initial
+          Right $ commitTx scriptRegistry networkId initialHeadId ownParty (Just aUTxO) initial
         [] -> do
-          Right $ commitTx scriptRegistry networkId ownParty Nothing initial
+          Right $ commitTx scriptRegistry networkId initialHeadId ownParty Nothing initial
         _ ->
           Left (MoreThanOneUTxOCommitted @Tx)
  where
@@ -306,6 +306,7 @@ commit ctx st utxo = do
   InitialState
     { initialInitials
     , initialHeadTokenScript
+    , initialHeadId
     } = st
 
   ownInitial :: Maybe (TxIn, TxOut CtxUTxO, Hash PaymentKey)
diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index 5f104961111..603ebb220cf 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -16,6 +16,7 @@ import Hydra.Prelude
 import qualified Cardano.Api.UTxO as UTxO
 import qualified Data.Aeson as Aeson
 import qualified Data.ByteString.Base16 as Base16
+import qualified Data.List as List
 import qualified Data.Map as Map
 import Hydra.Chain (HeadId (..), HeadParameters (..))
 import Hydra.Chain.Direct.ScriptRegistry (ScriptRegistry (..))
@@ -48,7 +49,8 @@ import Hydra.Ledger.Cardano.Builder (
 import Hydra.Party (Party, partyFromChain, partyToChain)
 import Hydra.Snapshot (Snapshot (..), SnapshotNumber, fromChainSnapshot)
 import Plutus.Orphans ()
-import Plutus.V2.Ledger.Api (fromBuiltin, fromData, toBuiltin)
+import Plutus.V1.Ledger.Value (symbols)
+import Plutus.V2.Ledger.Api (CurrencySymbol (CurrencySymbol), fromBuiltin, fromData, toBuiltin)
 import qualified Plutus.V2.Ledger.Api as Plutus
 
 -- | Needed on-chain data to create Head transactions.
@@ -161,13 +163,14 @@ mkInitialOutput networkId tokenPolicyId (verificationKeyHash -> pkh) =
   initialScript =
     fromPlutusScript Initial.validatorScript
   initialDatum =
-    mkTxOutDatum $ Initial.datum ()
+    mkTxOutDatum $ Initial.InitialDatum (List.head $ symbols $ toPlutusValue $ valueFromList [(AssetId tokenPolicyId (AssetName "foo"), 1)])
 
 -- | Craft a commit transaction which includes the "committed" utxo as a datum.
 commitTx ::
   -- | Published Hydra scripts to reference.
   ScriptRegistry ->
   NetworkId ->
+  HeadId ->
   Party ->
   -- | A single UTxO to commit to the Head
   -- We currently limit committing one UTxO to the head because of size limitations.
@@ -176,7 +179,7 @@ commitTx ::
   -- locked by initial script
   (TxIn, TxOut CtxUTxO, Hash PaymentKey) ->
   Tx
-commitTx scriptRegistry networkId party utxo (initialInput, out, vkh) =
+commitTx scriptRegistry networkId (HeadId headId) party utxo (initialInput, out, vkh) =
   unsafeBuildTransaction $
     emptyTxBody
       & addInputs [(initialInput, initialWitness)]
@@ -194,7 +197,7 @@ commitTx scriptRegistry networkId party utxo (initialInput, out, vkh) =
   initialScriptRef =
     fst (initialReference scriptRegistry)
   initialDatum =
-    mkScriptDatum $ Initial.datum ()
+    mkScriptDatum $ Initial.InitialDatum (CurrencySymbol $ toBuiltin headId)
   initialRedeemer =
     toScriptData . Initial.redeemer $
       Initial.ViaCommit (toPlutusTxOutRef <$> mCommittedInput)
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
index d963e686e74..2dbe6b251d0 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
@@ -10,15 +10,16 @@ import Hydra.Chain.Direct.TxSpec ()
 
 import qualified Cardano.Api.UTxO as UTxO
 import Data.Maybe (fromJust)
+import Hydra.Chain (HeadId (HeadId))
 import Hydra.Chain.Direct.Contract.Mutation (
   Mutation (..),
   SomeMutation (..),
-  replacePolicyIdWith
+  replacePolicyIdWith,
  )
 import qualified Hydra.Chain.Direct.Fixture as Fixture
-import qualified Hydra.Contract.Initial  as Initial
 import Hydra.Chain.Direct.ScriptRegistry (genScriptRegistry, registryUTxO)
-import Hydra.Chain.Direct.Tx (commitTx, headPolicyId, mkInitialOutput)
+import Hydra.Chain.Direct.Tx (commitTx, headPolicyId, mkHeadId, mkInitialOutput)
+import qualified Hydra.Contract.Initial as Initial
 import Hydra.Ledger.Cardano (
   genAddressInEra,
   genOutput,
@@ -26,6 +27,7 @@ import Hydra.Ledger.Cardano (
   genVerificationKey,
  )
 import Hydra.Party (Party)
+import Plutus.V1.Ledger.Api (toBuiltin)
 import Test.QuickCheck (oneof, suchThat)
 
 --
@@ -44,6 +46,7 @@ healthyCommitTx =
     commitTx
       scriptRegistry
       Fixture.testNetworkId
+      (mkHeadId policyId)
       commitParty
       (Just healthyCommittedUTxO)
       (initialInput, toUTxOContext initialOutput, initialPubKeyHash)
@@ -81,7 +84,6 @@ data CommitMutation
   | MutateRequiredSigner
   | -- | Change the policy Id of the PT both in input and output
     MutatePolicyId
-
   deriving (Generic, Show, Enum, Bounded)
 
 genCommitMutation :: (Tx, UTxO) -> Gen SomeMutation
@@ -104,10 +106,11 @@ genCommitMutation (tx, _utxo) =
         pure $ ChangeRequiredSigners [newSigner]
     , SomeMutation MutatePolicyId <$> do
         otherHeadId <- fmap headPolicyId (arbitrary `suchThat` (/= Fixture.testSeedInput))
-        pure $ Changes [ ChangeOutput 0 (replacePolicyIdWith otherHeadId commitTxOut)
-                       , ChangeInput initialInput (toUTxOContext $ replacePolicyIdWith otherHeadId initialOutput) (Just $ toScriptData $ Initial.ViaCommit $ Just $ toPlutusTxOutRef (fst healthyCommittedUTxO))
-                       ]
-
+        pure $
+          Changes
+            [ ChangeOutput 0 (replacePolicyIdWith otherHeadId commitTxOut)
+            , ChangeInput initialInput (toUTxOContext $ replacePolicyIdWith otherHeadId initialOutput) (Just $ toScriptData $ Initial.ViaCommit $ Just $ toPlutusTxOutRef (fst healthyCommittedUTxO))
+            ]
     ]
  where
   TxOut{txOutValue = commitOutputValue} = commitTxOut
diff --git a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
index f6644ac3dda..63f8d2efefb 100644
--- a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
@@ -13,6 +13,7 @@ import Hydra.Prelude hiding (label)
 import Test.Hydra.Prelude
 
 import qualified Cardano.Api.UTxO as UTxO
+import Cardano.Ledger.Alonzo.TxInfo (transPolicyID)
 import Cardano.Ledger.Babbage.PParams (PParams)
 import Data.List (intersectBy)
 import qualified Data.Map as Map
@@ -331,7 +332,7 @@ genAbortableOutputs parties =
 
   initialScript = fromPlutusScript Initial.validatorScript
 
-  initialDatum = Initial.datum ()
+  initialDatum = Initial.InitialDatum $ toPlutusPolicyId testPolicyId
 
 fst3 :: (a, b, c) -> a
 fst3 (a, _, _) = a
diff --git a/hydra-plutus/src/Hydra/Contract/Initial.hs b/hydra-plutus/src/Hydra/Contract/Initial.hs
index c58a057f8c3..5e752a3b859 100644
--- a/hydra-plutus/src/Hydra/Contract/Initial.hs
+++ b/hydra-plutus/src/Hydra/Contract/Initial.hs
@@ -12,6 +12,7 @@ import qualified Hydra.Contract.Commit as Commit
 import Plutus.Extras (ValidatorType, scriptValidatorHash, wrapValidator)
 import Plutus.V1.Ledger.Value (assetClass, assetClassValueOf)
 import Plutus.V2.Ledger.Api (
+  CurrencySymbol,
   Datum (..),
   FromData (fromBuiltinData),
   OutputDatum (..),
@@ -38,6 +39,12 @@ import qualified PlutusTx
 import qualified PlutusTx.AssocMap as AssocMap
 import qualified PlutusTx.Builtins as Builtins
 
+newtype InitialDatum = InitialDatum
+  { headPolicyId :: CurrencySymbol
+  }
+
+PlutusTx.unstableMakeIsData ''InitialDatum
+
 data InitialRedeemer
   = ViaAbort
   | ViaCommit
@@ -47,7 +54,7 @@ data InitialRedeemer
 
 PlutusTx.unstableMakeIsData ''InitialRedeemer
 
-type DatumType = ()
+type DatumType = InitialDatum
 type RedeemerType = InitialRedeemer
 
 -- | The v_initial validator verifies that:
@@ -64,33 +71,36 @@ type RedeemerType = InitialRedeemer
 validator ::
   -- | Commit validator
   ValidatorHash ->
-  () ->
+  InitialDatum ->
   InitialRedeemer ->
   ScriptContext ->
   Bool
-validator commitValidator () red context =
+validator commitValidator InitialDatum{headPolicyId} red context =
   case red of
     ViaAbort -> True
     ViaCommit{committedRef} ->
       checkCommit commitValidator committedRef context
-        && checkAuthor context
+        && checkAuthor context headPolicyId
 
 -- | Verifies that the commit is only done by the author
 checkAuthor ::
   ScriptContext ->
+  CurrencySymbol ->
   Bool
-checkAuthor context@ScriptContext{scriptContextTxInfo = txInfo} =
-  traceIfFalse "Missing or invalid commit author" $
-    elem (unTokenName ourParticipationTokenName) (getPubKeyHash <$> txInfoSignatories txInfo)
+checkAuthor context@ScriptContext{scriptContextTxInfo = txInfo} headPolicyId =
+  traceIfFalse
+    "Missing or invalid commit author"
+    (unTokenName ourParticipationTokenName `elem` (getPubKeyHash <$> txInfoSignatories txInfo))
+    && traceIfFalse "Invalid policy id" (policyId == headPolicyId)
  where
   -- NOTE: We don't check the currency symbol, only the well-formedness of the value that
   -- allows us to extract a token name, because this would be validated in other parts of the
   -- protocol.
-  ourParticipationTokenName =
+  (policyId, ourParticipationTokenName) =
     case AssocMap.toList (getValue initialValue) of
-      [_someAdas, (_headCurrencyHopefully, tokenMap)] ->
+      [_someAdas, (headCurrencyHopefully, tokenMap)] ->
         case AssocMap.toList tokenMap of
-          [(tk, q)] | q == 1 -> tk
+          [(tk, q)] | q == 1 -> (headCurrencyHopefully, tk)
           _ -> traceError "multiple head tokens or more than 1 PTs found"
       _ -> traceError "missing head tokens"
 

From 2214dcf1d1c0ca48010398d7fe2ea134f66ef9dd Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Thu, 22 Dec 2022 17:07:16 +0100
Subject: [PATCH 05/85] Fix failing test

---
 hydra-node/src/Hydra/Chain/Direct/Tx.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index 603ebb220cf..44e40c0f8a5 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -163,7 +163,7 @@ mkInitialOutput networkId tokenPolicyId (verificationKeyHash -> pkh) =
   initialScript =
     fromPlutusScript Initial.validatorScript
   initialDatum =
-    mkTxOutDatum $ Initial.InitialDatum (List.head $ symbols $ toPlutusValue $ valueFromList [(AssetId tokenPolicyId (AssetName "foo"), 1)])
+    mkTxOutDatum $ Initial.InitialDatum $ toPlutusPolicyId tokenPolicyId
 
 -- | Craft a commit transaction which includes the "committed" utxo as a datum.
 commitTx ::

From 8d52d6501c48e1522c06d387ef84cf60c8ee73dc Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Thu, 22 Dec 2022 17:13:34 +0100
Subject: [PATCH 06/85] Remove redundant imports

---
 hydra-node/src/Hydra/Chain/Direct/Tx.hs | 2 --
 1 file changed, 2 deletions(-)

diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index 44e40c0f8a5..cbfca9c6453 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -16,7 +16,6 @@ import Hydra.Prelude
 import qualified Cardano.Api.UTxO as UTxO
 import qualified Data.Aeson as Aeson
 import qualified Data.ByteString.Base16 as Base16
-import qualified Data.List as List
 import qualified Data.Map as Map
 import Hydra.Chain (HeadId (..), HeadParameters (..))
 import Hydra.Chain.Direct.ScriptRegistry (ScriptRegistry (..))
@@ -49,7 +48,6 @@ import Hydra.Ledger.Cardano.Builder (
 import Hydra.Party (Party, partyFromChain, partyToChain)
 import Hydra.Snapshot (Snapshot (..), SnapshotNumber, fromChainSnapshot)
 import Plutus.Orphans ()
-import Plutus.V1.Ledger.Value (symbols)
 import Plutus.V2.Ledger.Api (CurrencySymbol (CurrencySymbol), fromBuiltin, fromData, toBuiltin)
 import qualified Plutus.V2.Ledger.Api as Plutus
 

From 6c41bfdf64dcde6e381731afeab10ef7a8614a07 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Thu, 22 Dec 2022 17:30:20 +0100
Subject: [PATCH 07/85] Rename checkAuthor

---
 hydra-plutus/src/Hydra/Contract/Initial.hs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Initial.hs b/hydra-plutus/src/Hydra/Contract/Initial.hs
index 5e752a3b859..93b7c3f8d8a 100644
--- a/hydra-plutus/src/Hydra/Contract/Initial.hs
+++ b/hydra-plutus/src/Hydra/Contract/Initial.hs
@@ -80,14 +80,14 @@ validator commitValidator InitialDatum{headPolicyId} red context =
     ViaAbort -> True
     ViaCommit{committedRef} ->
       checkCommit commitValidator committedRef context
-        && checkAuthor context headPolicyId
+        && checkAuthorAndHeadPolicy context headPolicyId
 
 -- | Verifies that the commit is only done by the author
-checkAuthor ::
+checkAuthorAndHeadPolicy ::
   ScriptContext ->
   CurrencySymbol ->
   Bool
-checkAuthor context@ScriptContext{scriptContextTxInfo = txInfo} headPolicyId =
+checkAuthorAndHeadPolicy context@ScriptContext{scriptContextTxInfo = txInfo} headPolicyId =
   traceIfFalse
     "Missing or invalid commit author"
     (unTokenName ourParticipationTokenName `elem` (getPubKeyHash <$> txInfoSignatories txInfo))

From 87f3d2cbbb71efcb3c066e69ae0ae002f07eddcb Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Thu, 22 Dec 2022 17:33:08 +0100
Subject: [PATCH 08/85] Remove a note about not checking currency symbol

---
 hydra-plutus/src/Hydra/Contract/Initial.hs | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Initial.hs b/hydra-plutus/src/Hydra/Contract/Initial.hs
index 93b7c3f8d8a..5800a3b1ecd 100644
--- a/hydra-plutus/src/Hydra/Contract/Initial.hs
+++ b/hydra-plutus/src/Hydra/Contract/Initial.hs
@@ -93,9 +93,6 @@ checkAuthorAndHeadPolicy context@ScriptContext{scriptContextTxInfo = txInfo} hea
     (unTokenName ourParticipationTokenName `elem` (getPubKeyHash <$> txInfoSignatories txInfo))
     && traceIfFalse "Invalid policy id" (policyId == headPolicyId)
  where
-  -- NOTE: We don't check the currency symbol, only the well-formedness of the value that
-  -- allows us to extract a token name, because this would be validated in other parts of the
-  -- protocol.
   (policyId, ourParticipationTokenName) =
     case AssocMap.toList (getValue initialValue) of
       [_someAdas, (headCurrencyHopefully, tokenMap)] ->

From a0bce6ba96815bffa4aed802496285e85adf2a4a Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Tue, 27 Dec 2022 09:17:08 +0100
Subject: [PATCH 09/85] Remove redundant import

---
 hydra-node/test/Hydra/Chain/Direct/TxSpec.hs | 1 -
 1 file changed, 1 deletion(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
index 63f8d2efefb..f9f811447b4 100644
--- a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
@@ -13,7 +13,6 @@ import Hydra.Prelude hiding (label)
 import Test.Hydra.Prelude
 
 import qualified Cardano.Api.UTxO as UTxO
-import Cardano.Ledger.Alonzo.TxInfo (transPolicyID)
 import Cardano.Ledger.Babbage.PParams (PParams)
 import Data.List (intersectBy)
 import qualified Data.Map as Map

From 5e482d185a23a78d097eb51d75a2300f4ad7a0c4 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Tue, 27 Dec 2022 11:42:38 +0100
Subject: [PATCH 10/85] Start to thread the head token for Close tx

---
 hydra-node/src/Hydra/Chain/Direct/State.hs    |  3 +-
 hydra-node/src/Hydra/Chain/Direct/Tx.hs       | 15 ++++--
 .../test/Hydra/Chain/Direct/Contract/Abort.hs |  2 +-
 .../test/Hydra/Chain/Direct/Contract/Close.hs | 54 +++++++++++++------
 .../Hydra/Chain/Direct/Contract/CollectCom.hs | 14 +++--
 .../Hydra/Chain/Direct/Contract/Commit.hs     |  7 +--
 .../Hydra/Chain/Direct/Contract/Mutation.hs   |  9 ++--
 hydra-node/test/Hydra/Chain/Direct/TxSpec.hs  |  4 +-
 hydra-plutus/src/Hydra/Contract/Head.hs       | 41 +++++++++-----
 hydra-plutus/src/Hydra/Contract/HeadState.hs  |  4 +-
 10 files changed, 102 insertions(+), 51 deletions(-)

diff --git a/hydra-node/src/Hydra/Chain/Direct/State.hs b/hydra-node/src/Hydra/Chain/Direct/State.hs
index 599089d33b3..afc750bc191 100644
--- a/hydra-node/src/Hydra/Chain/Direct/State.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/State.hs
@@ -371,13 +371,14 @@ collect ::
   Tx
 collect ctx st = do
   let commits = Map.fromList $ fmap tripleToPair initialCommits
-   in collectComTx networkId ownVerificationKey initialThreadOutput commits
+   in collectComTx networkId ownVerificationKey initialThreadOutput commits initialHeadId
  where
   ChainContext{networkId, ownVerificationKey} = ctx
 
   InitialState
     { initialThreadOutput
     , initialCommits
+    , initialHeadId
     } = st
 
   tripleToPair (a, b, c) = (a, (b, c))
diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index cbfca9c6453..b1ecee971bb 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -149,6 +149,7 @@ mkHeadOutputInitial networkId tokenPolicyId HeadParameters{contestationPeriod, p
       Head.Initial
         (toChain contestationPeriod)
         (map partyToChain parties)
+        (toPlutusPolicyId tokenPolicyId)
 
 mkInitialOutput :: NetworkId -> PolicyId -> VerificationKey PaymentKey -> TxOut CtxTx
 mkInitialOutput networkId tokenPolicyId (verificationKeyHash -> pkh) =
@@ -233,8 +234,10 @@ collectComTx ::
   -- | Data needed to spend the commit output produced by each party.
   -- Should contain the PT and is locked by @ν_commit@ script.
   Map TxIn (TxOut CtxUTxO, ScriptData) ->
+  -- | Head id
+  HeadId ->
   Tx
-collectComTx networkId vk initialThreadOutput commits =
+collectComTx networkId vk initialThreadOutput commits (HeadId headId) =
   unsafeBuildTransaction $
     emptyTxBody
       & addInputs ((headInput, headWitness) : (mkCommit <$> Map.toList commits))
@@ -261,7 +264,13 @@ collectComTx networkId vk initialThreadOutput commits =
       headDatumAfter
       ReferenceScriptNone
   headDatumAfter =
-    mkTxOutDatum Head.Open{Head.parties = initialParties, utxoHash, contestationPeriod = initialContestationPeriod}
+    mkTxOutDatum
+      Head.Open
+        { Head.parties = initialParties
+        , utxoHash
+        , contestationPeriod = initialContestationPeriod
+        , openHeadPolicyId = CurrencySymbol $ toBuiltin headId
+        }
 
   extractCommit d =
     case fromData $ toPlutusData d of
@@ -578,7 +587,7 @@ observeInitTx ::
 observeInitTx networkId cardanoKeys expectedCP party tx = do
   -- FIXME: This is affected by "same structure datum attacks", we should be
   -- using the Head script address instead.
-  (ix, headOut, headData, Head.Initial cp ps) <- findFirst headOutput indexedOutputs
+  (ix, headOut, headData, Head.Initial cp ps _headPolicyId) <- findFirst headOutput indexedOutputs
   parties <- mapM partyFromChain ps
   let contestationPeriod = fromChain cp
   guard $ expectedCP == contestationPeriod
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
index c9e937ab28e..c9797b6ec71 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
@@ -148,7 +148,7 @@ genAbortMutation (tx, utxo) =
     [ SomeMutation MutateParties . ChangeHeadDatum <$> do
         moreParties <- (: healthyParties) <$> arbitrary
         c <- arbitrary
-        pure $ Head.Initial c (partyToChain <$> moreParties)
+        pure $ Head.Initial c (partyToChain <$> moreParties) (toPlutusPolicyId $ headPolicyId testSeedInput)
     , SomeMutation DropOneCommitOutput
         . RemoveOutput
         <$> choose (0, fromIntegral (length (txOuts' tx) - 1))
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index 0fc12730cb8..7866c1d383c 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -10,9 +10,10 @@ import Hydra.Prelude hiding (label)
 import Cardano.Api.UTxO as UTxO
 import Cardano.Binary (serialize')
 import Data.Maybe (fromJust)
-import Hydra.Chain.Direct.Contract.Mutation (Mutation (..), SomeMutation (..), addParticipationTokens, changeHeadOutputDatum, genHash)
-import Hydra.Chain.Direct.Fixture (genForParty, testNetworkId, testPolicyId)
-import Hydra.Chain.Direct.Tx (ClosingSnapshot (..), OpenThreadOutput (..), UTxOHash (UTxOHash), closeTx, mkHeadOutput)
+import Hydra.Chain.Direct.Contract.Mutation (Mutation (..), SomeMutation (..), addParticipationTokens, changeHeadOutputDatum, genHash, replacePolicyIdWith)
+import Hydra.Chain.Direct.Fixture (genForParty, testNetworkId)
+import qualified Hydra.Chain.Direct.Fixture as Fixture
+import Hydra.Chain.Direct.Tx (ClosingSnapshot (..), OpenThreadOutput (..), UTxOHash (UTxOHash), closeTx, headPolicyId, mkHeadOutput)
 import Hydra.ContestationPeriod (fromChain)
 import qualified Hydra.Contract.HeadState as Head
 import Hydra.Crypto (HydraKey, MultiSignature, aggregate, sign, toPlutusSignatures)
@@ -46,30 +47,35 @@ healthyCloseTx =
       pointInTime
       openThreadOutput
 
-  headInput = generateWith arbitrary 42
-
   -- here we need to pass in contestation period when generating start/end tx validity slots/time
   -- since if tx validity bound difference is bigger than contestation period our close validator
   -- will fail
   (startSlot, pointInTime) =
     genValidityBoundsFromContestationPeriod (fromChain healthyContestationPeriod) `generateWith` 42
 
-  headResolvedInput =
-    mkHeadOutput testNetworkId testPolicyId headTxOutDatum
-      & addParticipationTokens healthyParties
+  lookupUTxO = UTxO.singleton (headInput, headResolvedInput)
 
-  headTxOutDatum = toUTxOContext (mkTxOutDatum healthyCloseDatum)
+headTxOutDatum :: TxOutDatum CtxUTxO
+headTxOutDatum = toUTxOContext (mkTxOutDatum healthyCloseDatum)
 
-  headDatum = fromPlutusData $ toData healthyCloseDatum
+headResolvedInput :: TxOut CtxUTxO
+headResolvedInput =
+  mkHeadOutput testNetworkId policyId headTxOutDatum
+    & addParticipationTokens healthyParties
 
-  lookupUTxO = UTxO.singleton (headInput, headResolvedInput)
+headDatum :: ScriptData
+headDatum = fromPlutusData $ toData healthyCloseDatum
 
-  openThreadOutput =
-    OpenThreadOutput
-      { openThreadUTxO = (headInput, headResolvedInput, headDatum)
-      , openParties = healthyOnChainParties
-      , openContestationPeriod = healthyContestationPeriod
-      }
+openThreadOutput :: OpenThreadOutput
+openThreadOutput =
+  OpenThreadOutput
+    { openThreadUTxO = (headInput, headResolvedInput, headDatum)
+    , openParties = healthyOnChainParties
+    , openContestationPeriod = healthyContestationPeriod
+    }
+
+headInput :: TxIn
+headInput = generateWith arbitrary 42
 
 healthySlotNo :: SlotNo
 healthySlotNo = arbitrary `generateWith` 42
@@ -104,6 +110,7 @@ healthyCloseDatum =
     { parties = healthyOnChainParties
     , utxoHash = toBuiltin $ hashUTxO @Tx healthyUTxO
     , contestationPeriod = healthyContestationPeriod
+    , openHeadPolicyId = toPlutusPolicyId policyId
     }
 
 healthyContestationPeriod :: OnChain.ContestationPeriod
@@ -133,6 +140,9 @@ healthySignature number = aggregate [sign sk snapshot | sk <- healthySigningKeys
  where
   snapshot = healthySnapshot{number}
 
+policyId :: PolicyId
+policyId = headPolicyId headInput
+
 data CloseMutation
   = MutateSignatureButNotSnapshotNumber
   | MutateSnapshotNumberButNotSignature
@@ -143,6 +153,7 @@ data CloseMutation
   | MutateValidityInterval
   | MutateCloseContestationDeadline
   | MutateCloseContestationDeadlineWithZero
+  | MutatePolicyId
   deriving (Generic, Show, Enum, Bounded)
 
 genCloseMutation :: (Tx, UTxO) -> Gen SomeMutation
@@ -174,6 +185,7 @@ genCloseMutation (tx, _utxo) =
             { parties = mutatedParties
             , utxoHash = ""
             , contestationPeriod = healthyContestationPeriod
+            , openHeadPolicyId = toPlutusPolicyId $ headPolicyId Fixture.testSeedInput
             }
     , SomeMutation MutateRequiredSigner <$> do
         newSigner <- verificationKeyHash <$> genVerificationKey
@@ -191,6 +203,14 @@ genCloseMutation (tx, _utxo) =
         lb <- arbitrary
         ub <- (lb -) <$> choose (0, lb)
         pure (TxValidityLowerBound (SlotNo lb), TxValidityUpperBound (SlotNo ub))
+    , SomeMutation MutatePolicyId <$> do
+        otherHeadId <- headPolicyId <$> arbitrary `suchThat` (/= Fixture.testSeedInput)
+        let closeTxOut = fromJust $ txOuts' tx !!? 0
+        pure $
+          Changes
+            [ ChangeOutput 0 (replacePolicyIdWith otherHeadId closeTxOut)
+            , ChangeInput headInput (toUTxOContext $ replacePolicyIdWith otherHeadId (toTxContext headResolvedInput)) (Just $ toScriptData healthyCloseDatum)
+            ]
     ]
  where
   headTxOut = fromJust $ txOuts' tx !!? 0
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
index 073b212fcea..2bac6af661a 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
@@ -31,6 +31,7 @@ import Hydra.Chain.Direct.Tx (
   headPolicyId,
   headValue,
   mkCommitDatum,
+  mkHeadId,
   mkHeadOutput,
  )
 import qualified Hydra.Contract.Commit as Commit
@@ -63,6 +64,7 @@ healthyCollectComTx =
       somePartyCardanoVerificationKey
       initialThreadOutput
       commits
+      (mkHeadId testPolicyId)
 
   somePartyCardanoVerificationKey = flip generateWith 42 $ do
     genForParty genVerificationKey <$> elements healthyParties
@@ -105,6 +107,7 @@ healthyCollectComInitialDatum =
   Head.Initial
     { contestationPeriod = healthyContestationPeriod
     , parties = healthyOnChainParties
+    , initialHeadPolicyId = toPlutusPolicyId testPolicyId
     }
 
 healthyOnChainParties :: [OnChain.Party]
@@ -171,7 +174,7 @@ genCollectComMutation (tx, utxo) =
         <$> (ChangeInput (headTxIn utxo) <$> anyPayToPubKeyTxOut <*> pure Nothing)
     , SomeMutation MutateHeadTransition <$> do
         changeRedeemer <- ChangeHeadRedeemer <$> (Head.Close 0 . toBuiltin <$> genHash <*> arbitrary)
-        changeDatum <- ChangeHeadDatum <$> (Head.Open <$> arbitrary <*> arbitrary <*> (toBuiltin <$> genHash))
+        changeDatum <- ChangeHeadDatum <$> (Head.Open <$> arbitrary <*> arbitrary <*> (toBuiltin <$> genHash) <*> arbitrary)
         pure $ Changes [changeRedeemer, changeDatum]
     , SomeMutation MutateNumberOfParties <$> do
         -- NOTE: This also mutates the contestation period becuase we could not
@@ -180,7 +183,7 @@ genCollectComMutation (tx, utxo) =
         moreParties <- (: healthyOnChainParties) <$> arbitrary
         pure $
           Changes
-            [ ChangeHeadDatum $ Head.Initial c moreParties
+            [ ChangeHeadDatum $ Head.Initial c moreParties (toPlutusPolicyId testPolicyId)
             , ChangeOutput 0 $ mutatedPartiesHeadTxOut moreParties headTxOut
             ]
     , SomeMutation MutateHeadId <$> do
@@ -199,7 +202,8 @@ genCollectComMutation (tx, utxo) =
 
   mutatedPartiesHeadTxOut parties =
     changeHeadOutputDatum $ \case
-      Head.Open{utxoHash, contestationPeriod} -> Head.Open{Head.parties = parties, contestationPeriod, utxoHash}
+      Head.Open{utxoHash, contestationPeriod, openHeadPolicyId} ->
+        Head.Open{Head.parties = parties, contestationPeriod, utxoHash, openHeadPolicyId}
       st -> error $ "Unexpected state " <> show st
 
   mutateUTxOHash = do
@@ -207,6 +211,6 @@ genCollectComMutation (tx, utxo) =
     pure $ changeHeadOutputDatum (mutateState mutatedUTxOHash) headTxOut
 
   mutateState mutatedUTxOHash = \case
-    Head.Open{parties, contestationPeriod} ->
-      Head.Open{parties, contestationPeriod, Head.utxoHash = toBuiltin mutatedUTxOHash}
+    Head.Open{parties, contestationPeriod, openHeadPolicyId} ->
+      Head.Open{parties, contestationPeriod, Head.utxoHash = toBuiltin mutatedUTxOHash, openHeadPolicyId}
     st -> st
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
index 2dbe6b251d0..dca48376a31 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
@@ -10,7 +10,6 @@ import Hydra.Chain.Direct.TxSpec ()
 
 import qualified Cardano.Api.UTxO as UTxO
 import Data.Maybe (fromJust)
-import Hydra.Chain (HeadId (HeadId))
 import Hydra.Chain.Direct.Contract.Mutation (
   Mutation (..),
   SomeMutation (..),
@@ -27,7 +26,6 @@ import Hydra.Ledger.Cardano (
   genVerificationKey,
  )
 import Hydra.Party (Party)
-import Plutus.V1.Ledger.Api (toBuiltin)
 import Test.QuickCheck (oneof, suchThat)
 
 --
@@ -109,7 +107,10 @@ genCommitMutation (tx, _utxo) =
         pure $
           Changes
             [ ChangeOutput 0 (replacePolicyIdWith otherHeadId commitTxOut)
-            , ChangeInput initialInput (toUTxOContext $ replacePolicyIdWith otherHeadId initialOutput) (Just $ toScriptData $ Initial.ViaCommit $ Just $ toPlutusTxOutRef (fst healthyCommittedUTxO))
+            , ChangeInput
+                initialInput
+                (toUTxOContext $ replacePolicyIdWith otherHeadId initialOutput)
+                (Just $ toScriptData $ Initial.ViaCommit $ Just $ toPlutusTxOutRef (fst healthyCommittedUTxO))
             ]
     ]
  where
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
index 5e9ad279fd7..b2f562c25a8 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
@@ -560,8 +560,7 @@ addPTWithQuantity tx quantity =
     case mintedValue of
       TxMintValue v _ -> do
         -- NOTE: We do not expect Ada or any other assets to be minted, so
-        -- we can take the policy id from the headtake the policy id from
-        -- the head.
+        -- we can take the policy id from the head
         case Prelude.head $ valueToList v of
           (AdaAssetId, _) -> error "unexpected mint of Ada"
           (AssetId pid _an, _) -> do
@@ -576,10 +575,8 @@ addPTWithQuantity tx quantity =
 replacePolicyIdWith :: PolicyId -> TxOut a -> TxOut a
 replacePolicyIdWith otherHeadId output =
   let value = txOutValue output
-      newValue =
-        valueFromList $ map (swapPolicyId) $ valueToList value
+      newValue = valueFromList $ swapPolicyId <$> valueToList value
       swapPolicyId = \case
-        (AssetId policyId pkh, q)
-          | policyId == testPolicyId ->  (AssetId otherHeadId pkh, q)
+        (AssetId policyId pkh, q) | policyId == testPolicyId -> (AssetId otherHeadId pkh, q)
         v -> v
    in output{txOutValue = newValue}
diff --git a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
index f9f811447b4..749078218ac 100644
--- a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
@@ -78,7 +78,7 @@ spec =
                     consumedOutputs = fmap drop3rd commitsUTxO
                     headOutput = mkHeadOutput testNetworkId testPolicyId $ toUTxOContext $ mkTxOutDatum headDatum
                     onChainParties = partyToChain <$> parties
-                    headDatum = Head.Initial cperiod onChainParties
+                    headDatum = Head.Initial cperiod onChainParties (toPlutusPolicyId testPolicyId)
                     initialThreadOutput =
                       InitialThreadOutput
                         { initialThreadUTxO =
@@ -96,6 +96,7 @@ spec =
                         signer
                         initialThreadOutput
                         consumedOutputs
+                        (mkHeadId testPolicyId)
                  in case evaluateTx tx onChainUTxO of
                       Left basicFailure ->
                         property False & counterexample ("Basic failure: " <> show basicFailure)
@@ -119,6 +120,7 @@ spec =
                       Head.Initial
                         (contestationPeriodFromDiffTime contestationPeriod)
                         (map partyToChain parties)
+                        (toPlutusPolicyId testPolicyId)
                     initials = Map.fromList (drop2nd <$> resolvedInitials)
                     initialsUTxO = drop3rd <$> resolvedInitials
                     commits = Map.fromList (drop2nd <$> resolvedCommits)
diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index 5a86740dd51..bb0fed60e13 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -64,20 +64,22 @@ headValidator ::
   Bool
 headValidator oldState input context =
   case (oldState, input) of
-    (Initial{contestationPeriod, parties}, CollectCom) ->
-      checkCollectCom context headContext (contestationPeriod, parties)
+    (initialState@Initial{}, CollectCom) ->
+      let headContext = mkHeadContext context
+       in checkCollectCom context headContext initialState
     (Initial{parties}, Abort) ->
-      checkAbort context headContext parties
-    (Open{parties, utxoHash = initialUtxoHash, contestationPeriod}, Close{snapshotNumber, utxoHash = closedUtxoHash, signature}) ->
-      checkClose context headContext parties initialUtxoHash snapshotNumber closedUtxoHash signature contestationPeriod
+      let headContext = mkHeadContext context
+       in checkAbort context headContext parties
+    (Open{parties, utxoHash = initialUtxoHash, contestationPeriod, openHeadPolicyId}, Close{snapshotNumber, utxoHash = closedUtxoHash, signature}) ->
+      let headContext = mkHeadContext context
+       in checkClose context headContext parties initialUtxoHash snapshotNumber closedUtxoHash signature contestationPeriod openHeadPolicyId
     (Closed{parties, snapshotNumber = closedSnapshotNumber, contestationDeadline}, Contest{snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, signature}) ->
-      checkContest context headContext contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash signature
+      let headContext = mkHeadContext context
+       in checkContest context headContext contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash signature
     (Closed{utxoHash, contestationDeadline}, Fanout{numberOfFanoutOutputs}) ->
       checkFanout utxoHash contestationDeadline numberOfFanoutOutputs context
     _ ->
       traceError "invalid head state transition"
- where
-  headContext = mkHeadContext context
 
 data CheckCollectComError
   = NoContinuingOutput
@@ -185,9 +187,9 @@ checkCollectCom ::
   -- | Static information about the head (i.e. address, value, currency...)
   HeadContext ->
   -- | Initial state
-  (ContestationPeriod, [Party]) ->
+  State ->
   Bool
-checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headContext (contestationPeriod, parties) =
+checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headContext Initial{contestationPeriod, parties, initialHeadPolicyId} =
   mustContinueHeadWith context headAddress expectedChangeValue expectedOutputDatum
     && everyoneHasCommitted
     && mustBeSignedByParticipant context headContext
@@ -209,7 +211,7 @@ checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headContext
   expectedOutputDatum :: Datum
   expectedOutputDatum =
     let utxoHash = hashPreSerializedCommits collectedCommits
-     in Datum $ toBuiltinData Open{parties, utxoHash, contestationPeriod}
+     in Datum $ toBuiltinData Open{parties, utxoHash, contestationPeriod, openHeadPolicyId = initialHeadPolicyId}
 
   -- Collect fuel and commits from resolved inputs. Any output containing a PT
   -- is treated as a commit, "our" output is the head output and all remaining
@@ -251,6 +253,7 @@ checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headContext
         mCommit
       Nothing ->
         traceError "commitDatum failed fromBuiltinData"
+checkCollectCom _context _headContext _ = traceError "Expected Initial state in checkCollectCom"
 {-# INLINEABLE checkCollectCom #-}
 
 -- | The close validator must verify that:
@@ -272,14 +275,26 @@ checkClose ::
   BuiltinByteString ->
   [Signature] ->
   ContestationPeriod ->
+  CurrencySymbol ->
   Bool
-checkClose ctx headContext parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod =
+checkClose ctx _headContext parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod headPolicyId =
   hasBoundedValidity
     && checkSnapshot
-    && mustBeSignedByParticipant ctx headContext
+    -- && mustBeSignedByParticipant ctx headContext
+    && traceIfFalse "Wrong head policy id" (policyId == headPolicyId)
  where
   hasBoundedValidity = traceIfFalse "hasBoundedValidity check failed" $ tMax - tMin <= cp
 
+  closeValue =
+    maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
+
+  (policyId, _ourParticipationTokenName) =
+    case Map.toList (getValue closeValue) of
+      [_someAdas, (headCurrencyHopefully, tokenMap)] ->
+        case Map.toList tokenMap of
+          [(tk, q)] | q == 1 -> (headCurrencyHopefully, tk)
+          _ -> traceError "multiple head tokens or more than 1 PTs found in checkClose"
+      _ -> traceError "missing head token"
   checkSnapshot
     | snapshotNumber == 0 =
       let expectedOutputDatum =
diff --git a/hydra-plutus/src/Hydra/Contract/HeadState.hs b/hydra-plutus/src/Hydra/Contract/HeadState.hs
index fbd03ef6173..95791c81e6e 100644
--- a/hydra-plutus/src/Hydra/Contract/HeadState.hs
+++ b/hydra-plutus/src/Hydra/Contract/HeadState.hs
@@ -10,7 +10,7 @@ import PlutusTx.Prelude
 import GHC.Generics (Generic)
 import Hydra.Data.ContestationPeriod (ContestationPeriod)
 import Hydra.Data.Party (Party)
-import Plutus.V1.Ledger.Api (POSIXTime)
+import Plutus.V1.Ledger.Api (CurrencySymbol, POSIXTime)
 import qualified PlutusTx
 import Text.Show (Show)
 
@@ -24,11 +24,13 @@ data State
   = Initial
       { contestationPeriod :: ContestationPeriod
       , parties :: [Party]
+      , initialHeadPolicyId :: CurrencySymbol
       }
   | Open
       { contestationPeriod :: ContestationPeriod
       , parties :: [Party]
       , utxoHash :: Hash
+      , openHeadPolicyId :: CurrencySymbol
       }
   | Closed
       { parties :: [Party]

From 046c543767f108e78857a4ea6154450eab8dae60 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Tue, 27 Dec 2022 16:06:35 +0100
Subject: [PATCH 11/85] Use testPolicyId in Close mutation

---
 hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index 7866c1d383c..6d6c91e05db 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -60,7 +60,7 @@ headTxOutDatum = toUTxOContext (mkTxOutDatum healthyCloseDatum)
 
 headResolvedInput :: TxOut CtxUTxO
 headResolvedInput =
-  mkHeadOutput testNetworkId policyId headTxOutDatum
+  mkHeadOutput testNetworkId Fixture.testPolicyId headTxOutDatum
     & addParticipationTokens healthyParties
 
 headDatum :: ScriptData
@@ -110,7 +110,7 @@ healthyCloseDatum =
     { parties = healthyOnChainParties
     , utxoHash = toBuiltin $ hashUTxO @Tx healthyUTxO
     , contestationPeriod = healthyContestationPeriod
-    , openHeadPolicyId = toPlutusPolicyId policyId
+    , openHeadPolicyId = toPlutusPolicyId Fixture.testPolicyId
     }
 
 healthyContestationPeriod :: OnChain.ContestationPeriod
@@ -140,9 +140,6 @@ healthySignature number = aggregate [sign sk snapshot | sk <- healthySigningKeys
  where
   snapshot = healthySnapshot{number}
 
-policyId :: PolicyId
-policyId = headPolicyId headInput
-
 data CloseMutation
   = MutateSignatureButNotSnapshotNumber
   | MutateSnapshotNumberButNotSignature
@@ -185,7 +182,7 @@ genCloseMutation (tx, _utxo) =
             { parties = mutatedParties
             , utxoHash = ""
             , contestationPeriod = healthyContestationPeriod
-            , openHeadPolicyId = toPlutusPolicyId $ headPolicyId Fixture.testSeedInput
+            , openHeadPolicyId = toPlutusPolicyId Fixture.testPolicyId
             }
     , SomeMutation MutateRequiredSigner <$> do
         newSigner <- verificationKeyHash <$> genVerificationKey

From 565b6dea84543709410461a20a2394c96f7cef6f Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Tue, 27 Dec 2022 16:07:09 +0100
Subject: [PATCH 12/85] Replace all outputs with different policy id

---
 .../test/Hydra/Chain/Direct/Contract/Close.hs | 20 ++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index 6d6c91e05db..e5ff7c65f78 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -202,14 +202,24 @@ genCloseMutation (tx, _utxo) =
         pure (TxValidityLowerBound (SlotNo lb), TxValidityUpperBound (SlotNo ub))
     , SomeMutation MutatePolicyId <$> do
         otherHeadId <- headPolicyId <$> arbitrary `suchThat` (/= Fixture.testSeedInput)
-        let closeTxOut = fromJust $ txOuts' tx !!? 0
+        let closeTxOuts = txOuts' tx
         pure $
-          Changes
-            [ ChangeOutput 0 (replacePolicyIdWith otherHeadId closeTxOut)
-            , ChangeInput headInput (toUTxOContext $ replacePolicyIdWith otherHeadId (toTxContext headResolvedInput)) (Just $ toScriptData healthyCloseDatum)
-            ]
+          Changes $
+            changeAllOutputs 0 closeTxOuts otherHeadId
+              <> [ ChangeInput
+                    headInput
+                    (toUTxOContext $ replacePolicyIdWith otherHeadId (toTxContext headResolvedInput))
+                    (Just $ toScriptData healthyCloseDatum)
+                 ]
     ]
  where
+  changeAllOutputs :: Word -> [TxOut CtxTx] -> PolicyId -> [Mutation]
+  changeAllOutputs i outputs otherHead = go i outputs []
+   where
+    go _ [] r = r
+    go n (output : outputs') r =
+      let result = r <> [ChangeOutput i (replacePolicyIdWith otherHead output)]
+       in go (n + 1) outputs' result
   headTxOut = fromJust $ txOuts' tx !!? 0
 
   closeRedeemer snapshotNumber sig =

From d3bc0fb5002d591b582be281863c1ad723ae0c46 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Tue, 27 Dec 2022 16:07:56 +0100
Subject: [PATCH 13/85] Replace only single tokens

---
 hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
index b2f562c25a8..f69b3c7d92a 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
@@ -572,11 +572,12 @@ addPTWithQuantity tx quantity =
  where
   mintedValue = txMintValue $ txBodyContent $ txBody tx
 
+-- | Replace policy id with the arbitrary one
 replacePolicyIdWith :: PolicyId -> TxOut a -> TxOut a
 replacePolicyIdWith otherHeadId output =
   let value = txOutValue output
       newValue = valueFromList $ swapPolicyId <$> valueToList value
       swapPolicyId = \case
-        (AssetId policyId pkh, q) | policyId == testPolicyId -> (AssetId otherHeadId pkh, q)
+        (AssetId policyId pkh, q) | policyId == testPolicyId, q == 1 -> (AssetId otherHeadId pkh, q)
         v -> v
    in output{txOutValue = newValue}

From 1f78c2bb1f85b9f00a85c85cfdd6af0ba4893107 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Tue, 27 Dec 2022 16:08:19 +0100
Subject: [PATCH 14/85] Don't use HeadContext for checkClose - pass the policy
 in the datum

---
 .../Hydra/Chain/Direct/Contract/Commit.hs     |  2 +-
 hydra-plutus/src/Hydra/Contract/Head.hs       | 38 +++++++++----------
 2 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
index dca48376a31..69f1c2dd0c8 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
@@ -110,7 +110,7 @@ genCommitMutation (tx, _utxo) =
             , ChangeInput
                 initialInput
                 (toUTxOContext $ replacePolicyIdWith otherHeadId initialOutput)
-                (Just $ toScriptData $ Initial.ViaCommit $ Just $ toPlutusTxOutRef (fst healthyCommittedUTxO))
+                (Just $ toScriptData $ Initial.ViaCommit $ Just $ toPlutusTxOutRef committedTxIn)
             ]
     ]
  where
diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index bb0fed60e13..3cc651d8a01 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -71,8 +71,7 @@ headValidator oldState input context =
       let headContext = mkHeadContext context
        in checkAbort context headContext parties
     (Open{parties, utxoHash = initialUtxoHash, contestationPeriod, openHeadPolicyId}, Close{snapshotNumber, utxoHash = closedUtxoHash, signature}) ->
-      let headContext = mkHeadContext context
-       in checkClose context headContext parties initialUtxoHash snapshotNumber closedUtxoHash signature contestationPeriod openHeadPolicyId
+      checkClose context parties initialUtxoHash snapshotNumber closedUtxoHash signature contestationPeriod openHeadPolicyId
     (Closed{parties, snapshotNumber = closedSnapshotNumber, contestationDeadline}, Contest{snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, signature}) ->
       let headContext = mkHeadContext context
        in checkContest context headContext contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash signature
@@ -149,7 +148,7 @@ checkAbort ::
   Bool
 checkAbort context@ScriptContext{scriptContextTxInfo = txInfo} headContext parties =
   mustBurnAllHeadTokens
-    && mustBeSignedByParticipant context headContext
+    && mustBeSignedByParticipant context headCurrencySymbol
  where
   HeadContext{headCurrencySymbol} = headContext
 
@@ -192,7 +191,7 @@ checkCollectCom ::
 checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headContext Initial{contestationPeriod, parties, initialHeadPolicyId} =
   mustContinueHeadWith context headAddress expectedChangeValue expectedOutputDatum
     && everyoneHasCommitted
-    && mustBeSignedByParticipant context headContext
+    && mustBeSignedByParticipant context headCurrencySymbol
  where
   everyoneHasCommitted =
     traceIfFalse "not everyone committed" $
@@ -268,7 +267,6 @@ checkCollectCom _context _headContext _ = traceError "Expected Initial state in
 --   * The transaction is performed (i.e. signed) by one of the head participants
 checkClose ::
   ScriptContext ->
-  HeadContext ->
   [Party] ->
   BuiltinByteString ->
   SnapshotNumber ->
@@ -277,24 +275,26 @@ checkClose ::
   ContestationPeriod ->
   CurrencySymbol ->
   Bool
-checkClose ctx _headContext parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod headPolicyId =
+checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod headPolicyId =
   hasBoundedValidity
     && checkSnapshot
-    -- && mustBeSignedByParticipant ctx headContext
-    && traceIfFalse "Wrong head policy id" (policyId == headPolicyId)
+    && mustBeSignedByParticipant ctx headPolicyId
+    && traceIfFalse "Head policy id not present in checkClose" hasSTToken
  where
   hasBoundedValidity = traceIfFalse "hasBoundedValidity check failed" $ tMax - tMin <= cp
 
   closeValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
 
-  (policyId, _ourParticipationTokenName) =
-    case Map.toList (getValue closeValue) of
-      [_someAdas, (headCurrencyHopefully, tokenMap)] ->
-        case Map.toList tokenMap of
-          [(tk, q)] | q == 1 -> (headCurrencyHopefully, tk)
-          _ -> traceError "multiple head tokens or more than 1 PTs found in checkClose"
-      _ -> traceError "missing head token"
+  hasHydraToken tm =
+    isJust $ find (\(tn, q) -> q == 1 && TokenName hydraHeadV1 == tn) (Map.toList tm)
+
+  hasSTToken =
+    isJust $
+      find
+        (\(cs, tokenMap) -> cs == headPolicyId && hasHydraToken tokenMap)
+        (Map.toList $ getValue closeValue)
+
   checkSnapshot
     | snapshotNumber == 0 =
       let expectedOutputDatum =
@@ -359,11 +359,11 @@ checkContest ::
   BuiltinByteString ->
   [Signature] ->
   Bool
-checkContest ctx@ScriptContext{scriptContextTxInfo} headContext contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash sig =
+checkContest ctx@ScriptContext{scriptContextTxInfo} HeadContext{headCurrencySymbol} contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash sig =
   mustBeNewer
     && mustBeMultiSigned
     && checkHeadOutputDatum ctx (Closed{parties, snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, contestationDeadline})
-    && mustBeSignedByParticipant ctx headContext
+    && mustBeSignedByParticipant ctx headCurrencySymbol
     && mustBeWithinContestationPeriod
  where
   mustBeNewer =
@@ -437,9 +437,9 @@ checkFanout utxoHash contestationDeadline numberOfFanoutOutputs ScriptContext{sc
 
 mustBeSignedByParticipant ::
   ScriptContext ->
-  HeadContext ->
+  CurrencySymbol ->
   Bool
-mustBeSignedByParticipant ScriptContext{scriptContextTxInfo = txInfo} HeadContext{headCurrencySymbol} =
+mustBeSignedByParticipant ScriptContext{scriptContextTxInfo = txInfo} headCurrencySymbol =
   case getPubKeyHash <$> txInfoSignatories txInfo of
     [signer] ->
       traceIfFalse "mustBeSignedByParticipant: did not find expected signer" $

From 5cf26e04f7450c6fcdf9ea0891b12fc6d1be2c1c Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Tue, 27 Dec 2022 16:48:10 +0100
Subject: [PATCH 15/85] Use only necessary data from HeadContext

---
 hydra-plutus/src/Hydra/Contract/Head.hs | 35 ++++++++++---------------
 1 file changed, 14 insertions(+), 21 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index 3cc651d8a01..a1b9e5e984a 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -65,20 +65,20 @@ headValidator ::
 headValidator oldState input context =
   case (oldState, input) of
     (initialState@Initial{}, CollectCom) ->
-      let headContext = mkHeadContext context
-       in checkCollectCom context headContext initialState
-    (Initial{parties}, Abort) ->
-      let headContext = mkHeadContext context
-       in checkAbort context headContext parties
+      let HeadContext{headAddress} = headContext
+       in checkCollectCom context headAddress initialState
+    (Initial{parties, initialHeadPolicyId}, Abort) ->
+      checkAbort context initialHeadPolicyId parties
     (Open{parties, utxoHash = initialUtxoHash, contestationPeriod, openHeadPolicyId}, Close{snapshotNumber, utxoHash = closedUtxoHash, signature}) ->
       checkClose context parties initialUtxoHash snapshotNumber closedUtxoHash signature contestationPeriod openHeadPolicyId
     (Closed{parties, snapshotNumber = closedSnapshotNumber, contestationDeadline}, Contest{snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, signature}) ->
-      let headContext = mkHeadContext context
-       in checkContest context headContext contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash signature
+      checkContest context headContext contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash signature
     (Closed{utxoHash, contestationDeadline}, Fanout{numberOfFanoutOutputs}) ->
       checkFanout utxoHash contestationDeadline numberOfFanoutOutputs context
     _ ->
       traceError "invalid head state transition"
+ where
+  headContext = mkHeadContext context
 
 data CheckCollectComError
   = NoContinuingOutput
@@ -143,15 +143,13 @@ mkHeadContext context =
 --     which follows from burning all the PTs.
 checkAbort ::
   ScriptContext ->
-  HeadContext ->
+  CurrencySymbol ->
   [Party] ->
   Bool
-checkAbort context@ScriptContext{scriptContextTxInfo = txInfo} headContext parties =
+checkAbort context@ScriptContext{scriptContextTxInfo = txInfo} headCurrencySymbol parties =
   mustBurnAllHeadTokens
     && mustBeSignedByParticipant context headCurrencySymbol
  where
-  HeadContext{headCurrencySymbol} = headContext
-
   mustBurnAllHeadTokens =
     traceIfFalse "number of inputs do not match number of parties" $
       burntTokens == length parties + 1
@@ -183,25 +181,20 @@ checkAbort context@ScriptContext{scriptContextTxInfo = txInfo} headContext parti
 checkCollectCom ::
   -- | Script execution context
   ScriptContext ->
-  -- | Static information about the head (i.e. address, value, currency...)
-  HeadContext ->
+  -- | Head address
+  Address ->
   -- | Initial state
   State ->
   Bool
-checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headContext Initial{contestationPeriod, parties, initialHeadPolicyId} =
+checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headAddress Initial{contestationPeriod, parties, initialHeadPolicyId} =
   mustContinueHeadWith context headAddress expectedChangeValue expectedOutputDatum
     && everyoneHasCommitted
-    && mustBeSignedByParticipant context headCurrencySymbol
+    && mustBeSignedByParticipant context initialHeadPolicyId
  where
   everyoneHasCommitted =
     traceIfFalse "not everyone committed" $
       nTotalCommits == length parties
 
-  HeadContext
-    { headAddress
-    , headCurrencySymbol
-    } = headContext
-
   (expectedChangeValue, collectedCommits, nTotalCommits) =
     traverseInputs
       (negate (txInfoAdaFee txInfo), [], 0)
@@ -241,7 +234,7 @@ checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headContext
   isHeadOutput txOut = txOutAddress txOut == headAddress
 
   hasPT txOut =
-    let pts = findParticipationTokens headCurrencySymbol (txOutValue txOut)
+    let pts = findParticipationTokens initialHeadPolicyId (txOutValue txOut)
      in length pts == 1
 
   commitDatum :: TxOut -> Maybe Commit

From 658246750e7cf105164b41e17b83c19eaddf08c5 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Wed, 28 Dec 2022 09:26:56 +0100
Subject: [PATCH 16/85] Add original policy to replace in replacePolicyIdWith

---
 .../test/Hydra/Chain/Direct/Contract/Abort.hs |  2 +-
 .../test/Hydra/Chain/Direct/Contract/Close.hs | 10 +++++-----
 .../Hydra/Chain/Direct/Contract/Commit.hs     | 20 +++++++------------
 .../Hydra/Chain/Direct/Contract/Mutation.hs   |  8 ++++----
 4 files changed, 17 insertions(+), 23 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
index c9797b6ec71..27c3ce5f911 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
@@ -170,7 +170,7 @@ genAbortMutation (tx, utxo) =
         otherHeadId <- fmap headPolicyId (arbitrary `suchThat` (/= testSeedInput))
         pure $
           Changes
-            [ ChangeInput input (replacePolicyIdWith otherHeadId output) (Just $ toScriptData Initial.ViaAbort)
+            [ ChangeInput input (replacePolicyIdWith testPolicyId otherHeadId output) (Just $ toScriptData Initial.ViaAbort)
             , ChangeMintedValue (removePTFromMintedValue output tx)
             ]
     ]
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index e5ff7c65f78..f0fe9c42d3f 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -205,20 +205,20 @@ genCloseMutation (tx, _utxo) =
         let closeTxOuts = txOuts' tx
         pure $
           Changes $
-            changeAllOutputs 0 closeTxOuts otherHeadId
+            changeAllOutputs 0 closeTxOuts Fixture.testPolicyId otherHeadId
               <> [ ChangeInput
                     headInput
-                    (toUTxOContext $ replacePolicyIdWith otherHeadId (toTxContext headResolvedInput))
+                    (toUTxOContext $ replacePolicyIdWith Fixture.testPolicyId otherHeadId (toTxContext headResolvedInput))
                     (Just $ toScriptData healthyCloseDatum)
                  ]
     ]
  where
-  changeAllOutputs :: Word -> [TxOut CtxTx] -> PolicyId -> [Mutation]
-  changeAllOutputs i outputs otherHead = go i outputs []
+  changeAllOutputs :: Word -> [TxOut CtxTx] -> PolicyId -> PolicyId -> [Mutation]
+  changeAllOutputs i outputs originalHead otherHead = go i outputs []
    where
     go _ [] r = r
     go n (output : outputs') r =
-      let result = r <> [ChangeOutput i (replacePolicyIdWith otherHead output)]
+      let result = r <> [ChangeOutput i (replacePolicyIdWith originalHead otherHead output)]
        in go (n + 1) outputs' result
   headTxOut = fromJust $ txOuts' tx !!? 0
 
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
index 69f1c2dd0c8..86ed48b639a 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
@@ -37,17 +37,17 @@ healthyCommitTx =
   (tx, lookupUTxO)
  where
   lookupUTxO =
-    UTxO.singleton (initialInput, toUTxOContext initialOutput)
+    UTxO.singleton (Fixture.testSeedInput, toUTxOContext initialOutput)
       <> UTxO.singleton healthyCommittedUTxO
       <> registryUTxO scriptRegistry
   tx =
     commitTx
       scriptRegistry
       Fixture.testNetworkId
-      (mkHeadId policyId)
+      (mkHeadId Fixture.testPolicyId)
       commitParty
       (Just healthyCommittedUTxO)
-      (initialInput, toUTxOContext initialOutput, initialPubKeyHash)
+      (Fixture.testSeedInput, toUTxOContext initialOutput, initialPubKeyHash)
 
   scriptRegistry = genScriptRegistry `generateWith` 42
 
@@ -59,14 +59,8 @@ healthyCommitTx =
 commitVerificationKey :: VerificationKey PaymentKey
 commitVerificationKey = generateWith arbitrary 42
 
-initialInput :: TxIn
-initialInput = generateWith arbitrary 42
-
 initialOutput :: TxOut CtxTx
-initialOutput = mkInitialOutput Fixture.testNetworkId policyId commitVerificationKey
-
-policyId :: PolicyId
-policyId = headPolicyId initialInput
+initialOutput = mkInitialOutput Fixture.testNetworkId Fixture.testPolicyId commitVerificationKey
 
 -- NOTE: An 8₳ output which is currently addressed to some arbitrary key.
 healthyCommittedUTxO :: (TxIn, TxOut CtxUTxO)
@@ -106,10 +100,10 @@ genCommitMutation (tx, _utxo) =
         otherHeadId <- fmap headPolicyId (arbitrary `suchThat` (/= Fixture.testSeedInput))
         pure $
           Changes
-            [ ChangeOutput 0 (replacePolicyIdWith otherHeadId commitTxOut)
+            [ ChangeOutput 0 (replacePolicyIdWith Fixture.testPolicyId otherHeadId commitTxOut)
             , ChangeInput
-                initialInput
-                (toUTxOContext $ replacePolicyIdWith otherHeadId initialOutput)
+                Fixture.testSeedInput
+                (toUTxOContext $ replacePolicyIdWith Fixture.testPolicyId otherHeadId initialOutput)
                 (Just $ toScriptData $ Initial.ViaCommit $ Just $ toPlutusTxOutRef committedTxIn)
             ]
     ]
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
index f69b3c7d92a..0acbfc5c3b9 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
@@ -572,12 +572,12 @@ addPTWithQuantity tx quantity =
  where
   mintedValue = txMintValue $ txBodyContent $ txBody tx
 
--- | Replace policy id with the arbitrary one
-replacePolicyIdWith :: PolicyId -> TxOut a -> TxOut a
-replacePolicyIdWith otherHeadId output =
+-- | Replace original policy id with the arbitrary one
+replacePolicyIdWith :: PolicyId -> PolicyId -> TxOut a -> TxOut a
+replacePolicyIdWith originalHeadId otherHeadId output =
   let value = txOutValue output
       newValue = valueFromList $ swapPolicyId <$> valueToList value
       swapPolicyId = \case
-        (AssetId policyId pkh, q) | policyId == testPolicyId, q == 1 -> (AssetId otherHeadId pkh, q)
+        (AssetId policyId t, q) | policyId == originalHeadId, q == 1 -> (AssetId otherHeadId t, q)
         v -> v
    in output{txOutValue = newValue}

From e9ed48de0560a0906446a516e8968b75437609b5 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Wed, 28 Dec 2022 10:07:40 +0100
Subject: [PATCH 17/85] Thread head policy id through Closed constructor

---
 hydra-node/src/Hydra/Chain/Direct/State.hs    |  6 +-
 hydra-node/src/Hydra/Chain/Direct/Tx.hs       |  8 ++-
 .../test/Hydra/Chain/Direct/Contract/Close.hs |  7 ++-
 .../Hydra/Chain/Direct/Contract/Contest.hs    |  6 +-
 .../Hydra/Chain/Direct/Contract/FanOut.hs     |  1 +
 hydra-plutus/src/Hydra/Contract/Head.hs       | 62 +++++--------------
 hydra-plutus/src/Hydra/Contract/HeadState.hs  |  1 +
 7 files changed, 38 insertions(+), 53 deletions(-)

diff --git a/hydra-node/src/Hydra/Chain/Direct/State.hs b/hydra-node/src/Hydra/Chain/Direct/State.hs
index afc750bc191..df4a775a27d 100644
--- a/hydra-node/src/Hydra/Chain/Direct/State.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/State.hs
@@ -399,7 +399,7 @@ close ::
   PointInTime ->
   Tx
 close ctx st confirmedSnapshot startSlotNo pointInTime =
-  closeTx ownVerificationKey closingSnapshot startSlotNo pointInTime openThreadOutput
+  closeTx ownVerificationKey closingSnapshot startSlotNo pointInTime openThreadOutput openHeadId
  where
   closingSnapshot = case confirmedSnapshot of
     -- XXX: Not needing anything of the 'InitialSnapshot' is another hint that
@@ -417,6 +417,7 @@ close ctx st confirmedSnapshot startSlotNo pointInTime =
   OpenState
     { openThreadOutput
     , openUtxoHash
+    , openHeadId
     } = st
 
 -- | Construct a contest transaction based on the 'ClosedState' and a confirmed
@@ -429,7 +430,7 @@ contest ::
   PointInTime ->
   Tx
 contest ctx st confirmedSnapshot pointInTime = do
-  contestTx ownVerificationKey sn sigs pointInTime closedThreadOutput
+  contestTx ownVerificationKey sn sigs pointInTime closedThreadOutput closedHeadId
  where
   (sn, sigs) =
     case confirmedSnapshot of
@@ -440,6 +441,7 @@ contest ctx st confirmedSnapshot pointInTime = do
 
   ClosedState
     { closedThreadOutput
+    , closedHeadId
     } = st
 
 -- | Construct a fanout transaction based on the 'ClosedState' and off-chain
diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index b1ecee971bb..d7784b889b0 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -321,8 +321,9 @@ closeTx ::
   PointInTime ->
   -- | Everything needed to spend the Head state-machine output.
   OpenThreadOutput ->
+  HeadId ->
   Tx
-closeTx vk closing startSlotNo (endSlotNo, utcTime) openThreadOutput =
+closeTx vk closing startSlotNo (endSlotNo, utcTime) openThreadOutput (HeadId headId) =
   unsafeBuildTransaction $
     emptyTxBody
       & addInputs [(headInput, headWitness)]
@@ -361,6 +362,7 @@ closeTx vk closing startSlotNo (endSlotNo, utcTime) openThreadOutput =
         , utxoHash = toBuiltin utxoHashBytes
         , parties = openParties
         , contestationDeadline
+        , closedHeadPolicyId = CurrencySymbol $ toBuiltin headId
         }
 
   snapshotNumber = toInteger $ case closing of
@@ -394,8 +396,9 @@ contestTx ::
   PointInTime ->
   -- | Everything needed to spend the Head state-machine output.
   ClosedThreadOutput ->
+  HeadId ->
   Tx
-contestTx vk Snapshot{number, utxo} sig (slotNo, _) ClosedThreadOutput{closedThreadUTxO = (headInput, headOutputBefore, ScriptDatumForTxIn -> headDatumBefore), closedParties, closedContestationDeadline} =
+contestTx vk Snapshot{number, utxo} sig (slotNo, _) ClosedThreadOutput{closedThreadUTxO = (headInput, headOutputBefore, ScriptDatumForTxIn -> headDatumBefore), closedParties, closedContestationDeadline} (HeadId headId) =
   unsafeBuildTransaction $
     emptyTxBody
       & addInputs [(headInput, headWitness)]
@@ -423,6 +426,7 @@ contestTx vk Snapshot{number, utxo} sig (slotNo, _) ClosedThreadOutput{closedThr
         , utxoHash
         , parties = closedParties
         , contestationDeadline = closedContestationDeadline
+        , closedHeadPolicyId = CurrencySymbol $ toBuiltin headId
         }
   utxoHash = toBuiltin $ hashUTxO @Tx utxo
 
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index f0fe9c42d3f..d49853d7468 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -13,7 +13,7 @@ import Data.Maybe (fromJust)
 import Hydra.Chain.Direct.Contract.Mutation (Mutation (..), SomeMutation (..), addParticipationTokens, changeHeadOutputDatum, genHash, replacePolicyIdWith)
 import Hydra.Chain.Direct.Fixture (genForParty, testNetworkId)
 import qualified Hydra.Chain.Direct.Fixture as Fixture
-import Hydra.Chain.Direct.Tx (ClosingSnapshot (..), OpenThreadOutput (..), UTxOHash (UTxOHash), closeTx, headPolicyId, mkHeadOutput)
+import Hydra.Chain.Direct.Tx (ClosingSnapshot (..), OpenThreadOutput (..), UTxOHash (UTxOHash), closeTx, headPolicyId, mkHeadId, mkHeadOutput)
 import Hydra.ContestationPeriod (fromChain)
 import qualified Hydra.Contract.HeadState as Head
 import Hydra.Crypto (HydraKey, MultiSignature, aggregate, sign, toPlutusSignatures)
@@ -46,6 +46,7 @@ healthyCloseTx =
       startSlot
       pointInTime
       openThreadOutput
+      (mkHeadId Fixture.testPolicyId)
 
   -- here we need to pass in contestation period when generating start/end tx validity slots/time
   -- since if tx validity bound difference is bigger than contestation period our close validator
@@ -235,12 +236,13 @@ genCloseMutation (tx, _utxo) =
     pure $ changeHeadOutputDatum (mutateHash mutatedUTxOHash) headTxOut
 
   mutateHash mutatedUTxOHash = \case
-    Head.Closed{snapshotNumber, parties, contestationDeadline} ->
+    Head.Closed{snapshotNumber, parties, contestationDeadline, closedHeadPolicyId} ->
       Head.Closed
         { snapshotNumber
         , utxoHash = toBuiltin mutatedUTxOHash
         , parties
         , contestationDeadline
+        , closedHeadPolicyId
         }
     st -> error $ "unexpected state " <> show st
   -- In case contestation period param is 'Nothing' we will generate arbitrary value
@@ -259,5 +261,6 @@ genCloseMutation (tx, _utxo) =
         , contestationDeadline =
             let closingTime = slotNoToUTCTime healthySlotNo
              in posixFromUTCTime $ addUTCTime (fromInteger contestationPeriod) closingTime
+        , closedHeadPolicyId = toPlutusPolicyId Fixture.testPolicyId
         }
     st -> error $ "unexpected state " <> show st
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
index 909db725f76..9e428198d8f 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
@@ -18,7 +18,7 @@ import Hydra.Chain.Direct.Contract.Mutation (
   genHash,
  )
 import Hydra.Chain.Direct.Fixture (genForParty, testNetworkId, testPolicyId)
-import Hydra.Chain.Direct.Tx (ClosedThreadOutput (..), contestTx, mkHeadOutput)
+import Hydra.Chain.Direct.Tx (ClosedThreadOutput (..), contestTx, mkHeadId, mkHeadOutput)
 import qualified Hydra.Contract.HeadState as Head
 import Hydra.Crypto (HydraKey, MultiSignature, aggregate, sign, toPlutusSignatures)
 import Hydra.Data.ContestationPeriod (posixFromUTCTime)
@@ -50,6 +50,7 @@ healthyContestTx =
       (healthySignature healthyContestSnapshotNumber)
       (healthySlotNo, slotNoToUTCTime healthySlotNo)
       closedThreadOutput
+      (mkHeadId testPolicyId)
 
   headInput = generateWith arbitrary 42
 
@@ -98,6 +99,7 @@ healthyClosedState =
     , utxoHash = healthyClosedUTxOHash
     , parties = healthyOnChainParties
     , contestationDeadline = posixFromUTCTime healthyContestationDeadline
+    , closedHeadPolicyId = toPlutusPolicyId testPolicyId
     }
 
 healthySlotNo :: SlotNo
@@ -196,6 +198,7 @@ genContestMutation
               , utxoHash = healthyClosedUTxOHash
               , snapshotNumber = fromIntegral healthyClosedSnapshotNumber
               , contestationDeadline = arbitrary `generateWith` 42
+              , closedHeadPolicyId = toPlutusPolicyId testPolicyId
               }
       , SomeMutation MutateValidityPastDeadline . ChangeValidityInterval <$> do
           lb <- arbitrary
@@ -216,6 +219,7 @@ genContestMutation
                 , utxoHash = toBuiltin mutatedUTxOHash
                 , parties = healthyOnChainParties
                 , contestationDeadline = arbitrary `generateWith` 42
+                , closedHeadPolicyId = toPlutusPolicyId testPolicyId
                 }
           )
           headTxOut
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
index 245ed840e80..575da24d1af 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
@@ -80,6 +80,7 @@ healthyFanoutDatum =
     , utxoHash = toBuiltin $ hashUTxO @Tx healthyFanoutUTxO
     , parties = partyToChain <$> arbitrary `generateWith` 42
     , contestationDeadline = posixFromUTCTime healthyContestationDeadline
+    , closedHeadPolicyId = toPlutusPolicyId testPolicyId
     }
 
 data FanoutMutation
diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index a1b9e5e984a..95447c721f5 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -65,20 +65,17 @@ headValidator ::
 headValidator oldState input context =
   case (oldState, input) of
     (initialState@Initial{}, CollectCom) ->
-      let HeadContext{headAddress} = headContext
-       in checkCollectCom context headAddress initialState
+      checkCollectCom context (mkHeadAddress context) initialState
     (Initial{parties, initialHeadPolicyId}, Abort) ->
       checkAbort context initialHeadPolicyId parties
     (Open{parties, utxoHash = initialUtxoHash, contestationPeriod, openHeadPolicyId}, Close{snapshotNumber, utxoHash = closedUtxoHash, signature}) ->
       checkClose context parties initialUtxoHash snapshotNumber closedUtxoHash signature contestationPeriod openHeadPolicyId
-    (Closed{parties, snapshotNumber = closedSnapshotNumber, contestationDeadline}, Contest{snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, signature}) ->
-      checkContest context headContext contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash signature
+    (Closed{parties, snapshotNumber = closedSnapshotNumber, contestationDeadline, closedHeadPolicyId}, Contest{snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, signature}) ->
+      checkContest context contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash signature closedHeadPolicyId
     (Closed{utxoHash, contestationDeadline}, Fanout{numberOfFanoutOutputs}) ->
       checkFanout utxoHash contestationDeadline numberOfFanoutOutputs context
     _ ->
       traceError "invalid head state transition"
- where
-  headContext = mkHeadContext context
 
 data CheckCollectComError
   = NoContinuingOutput
@@ -86,19 +83,9 @@ data CheckCollectComError
   | OutputValueNotPreserved
   | OutputHashNotMatching
 
-data HeadContext = HeadContext
-  { headAddress :: Address
-  , headInputValue :: Value
-  , headCurrencySymbol :: CurrencySymbol
-  }
-
-mkHeadContext :: ScriptContext -> HeadContext
-mkHeadContext context =
-  HeadContext
-    { headAddress
-    , headInputValue
-    , headCurrencySymbol
-    }
+mkHeadAddress :: ScriptContext -> Address
+mkHeadAddress context =
+  headAddress
  where
   headInput :: TxInInfo
   headInput =
@@ -106,32 +93,10 @@ mkHeadContext context =
       (traceError "script not spending a head input?")
       (findOwnInput context)
 
-  headInputValue :: Value
-  headInputValue =
-    txOutValue (txInInfoResolved headInput)
-
   headAddress :: Address
   headAddress =
     txOutAddress (txInInfoResolved headInput)
-
-  headCurrencySymbol :: CurrencySymbol
-  headCurrencySymbol =
-    headInputValue
-      & findCandidateSymbols
-      & \case
-        [s] -> s
-        _ -> traceError "malformed thread token, expected exactly one asset."
-
-  findCandidateSymbols :: Value -> [CurrencySymbol]
-  findCandidateSymbols (Value v) = loop (Map.toList v)
-   where
-    loop = \case
-      [] -> []
-      (symbol, assets) : rest ->
-        case filter ((TokenName hydraHeadV1, 1) ==) (Map.toList assets) of
-          [] -> loop rest
-          _ -> symbol : loop rest
-{-# INLINEABLE mkHeadContext #-}
+{-# INLINEABLE mkHeadAddress #-}
 
 -- | On-Chain verification for 'Abort' transition. It verifies that:
 --
@@ -296,6 +261,7 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
               , snapshotNumber = 0
               , utxoHash = initialUtxoHash
               , contestationDeadline = makeContestationDeadline cperiod ctx
+              , closedHeadPolicyId = headPolicyId
               }
        in checkHeadOutputDatum ctx expectedOutputDatum
     | snapshotNumber > 0 =
@@ -305,6 +271,7 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
               , snapshotNumber
               , utxoHash = closedUtxoHash
               , contestationDeadline = makeContestationDeadline cperiod ctx
+              , closedHeadPolicyId = headPolicyId
               }
        in verifySnapshotSignature parties snapshotNumber closedUtxoHash sig
             && checkHeadOutputDatum ctx expectedOutputDatum
@@ -341,7 +308,6 @@ makeContestationDeadline cperiod ScriptContext{scriptContextTxInfo} =
 --   * The transaction is performed (i.e. signed) by one of the head participants
 checkContest ::
   ScriptContext ->
-  HeadContext ->
   POSIXTime ->
   [Party] ->
   -- | Snapshot number of the closed state.
@@ -351,12 +317,16 @@ checkContest ::
   SnapshotNumber ->
   BuiltinByteString ->
   [Signature] ->
+  -- | Head id
+  CurrencySymbol ->
   Bool
-checkContest ctx@ScriptContext{scriptContextTxInfo} HeadContext{headCurrencySymbol} contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash sig =
+checkContest ctx@ScriptContext{scriptContextTxInfo} contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash sig headPolicyId =
   mustBeNewer
     && mustBeMultiSigned
-    && checkHeadOutputDatum ctx (Closed{parties, snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, contestationDeadline})
-    && mustBeSignedByParticipant ctx headCurrencySymbol
+    && checkHeadOutputDatum
+      ctx
+      (Closed{parties, snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, contestationDeadline, closedHeadPolicyId = headPolicyId})
+    && mustBeSignedByParticipant ctx headPolicyId
     && mustBeWithinContestationPeriod
  where
   mustBeNewer =
diff --git a/hydra-plutus/src/Hydra/Contract/HeadState.hs b/hydra-plutus/src/Hydra/Contract/HeadState.hs
index 95791c81e6e..033239fea42 100644
--- a/hydra-plutus/src/Hydra/Contract/HeadState.hs
+++ b/hydra-plutus/src/Hydra/Contract/HeadState.hs
@@ -37,6 +37,7 @@ data State
       , snapshotNumber :: SnapshotNumber
       , utxoHash :: Hash
       , contestationDeadline :: POSIXTime
+      , closedHeadPolicyId :: CurrencySymbol
       }
   | Final
   deriving stock (Generic, Show)

From fdcec4bec0c59508183c612d7473ca9a4ef1c561 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Wed, 28 Dec 2022 16:30:08 +0100
Subject: [PATCH 18/85] Fix collectCom validator and check head id for mutation
 to work

---
 hydra-plutus/src/Hydra/Contract/Head.hs | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index 95447c721f5..d93b6086086 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -155,7 +155,10 @@ checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headAddress
   mustContinueHeadWith context headAddress expectedChangeValue expectedOutputDatum
     && everyoneHasCommitted
     && mustBeSignedByParticipant context initialHeadPolicyId
+    && traceIfFalse "Head policy id not present in checkCollectCom" (hasSTToken initialHeadPolicyId collectValue)
  where
+  collectValue =
+    maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput context
   everyoneHasCommitted =
     traceIfFalse "not everyone committed" $
       nTotalCommits == length parties
@@ -237,22 +240,13 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
   hasBoundedValidity
     && checkSnapshot
     && mustBeSignedByParticipant ctx headPolicyId
-    && traceIfFalse "Head policy id not present in checkClose" hasSTToken
+    && traceIfFalse "Head policy id not present in checkClose" (hasSTToken headPolicyId closeValue)
  where
   hasBoundedValidity = traceIfFalse "hasBoundedValidity check failed" $ tMax - tMin <= cp
 
   closeValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
 
-  hasHydraToken tm =
-    isJust $ find (\(tn, q) -> q == 1 && TokenName hydraHeadV1 == tn) (Map.toList tm)
-
-  hasSTToken =
-    isJust $
-      find
-        (\(cs, tokenMap) -> cs == headPolicyId && hasHydraToken tokenMap)
-        (Map.toList $ getValue closeValue)
-
   checkSnapshot
     | snapshotNumber == 0 =
       let expectedOutputDatum =
@@ -290,6 +284,17 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
   ScriptContext{scriptContextTxInfo = txInfo} = ctx
 {-# INLINEABLE checkClose #-}
 
+hasSTToken :: CurrencySymbol -> Value -> Bool
+hasSTToken headPolicyId v =
+  isJust $
+    find
+      (\(cs, tokenMap) -> cs == headPolicyId && hasHydraToken tokenMap)
+      (Map.toList $ getValue v)
+ where
+  hasHydraToken tm =
+    isJust $ find (\(tn, q) -> q == 1 && TokenName hydraHeadV1 == tn) (Map.toList tm)
+{-# INLINEABLE hasSTToken #-}
+
 makeContestationDeadline :: ContestationPeriod -> ScriptContext -> POSIXTime
 makeContestationDeadline cperiod ScriptContext{scriptContextTxInfo} =
   case ivTo (txInfoValidRange scriptContextTxInfo) of

From 2f3abd3355da2a961a781cfa5f7302bfef5d83f5 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Wed, 28 Dec 2022 16:37:21 +0100
Subject: [PATCH 19/85] Change the number of outputs for the fanout tx to fix
 the tests

---
 hydra-node/test/Hydra/Chain/Direct/StateSpec.hs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
index 35f8a96c7c6..f5aec935e9c 100644
--- a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
@@ -388,7 +388,8 @@ forAllFanout action =
        in action utxo tx
             & label ("Fanout size: " <> prettyLength (countAssets $ txOuts' tx))
  where
-  maxSupported = 70
+  -- TODO: Can we go back to 70 outputs here?
+  maxSupported = 60
 
   countAssets = getSum . foldMap (Sum . valueSize . txOutValue)
 

From d1f0e4c74f4fb79508a7c49a1cc83c241df860bb Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Wed, 28 Dec 2022 17:57:53 +0100
Subject: [PATCH 20/85] Check for head id in contest validator

---
 hydra-plutus/src/Hydra/Contract/Head.hs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index d93b6086086..553912e8c70 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -333,7 +333,10 @@ checkContest ctx@ScriptContext{scriptContextTxInfo} contestationDeadline parties
       (Closed{parties, snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, contestationDeadline, closedHeadPolicyId = headPolicyId})
     && mustBeSignedByParticipant ctx headPolicyId
     && mustBeWithinContestationPeriod
+    && traceIfFalse "Head policy id not present in checkContest" (hasSTToken headPolicyId contestValue)
  where
+  contestValue =
+    maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
   mustBeNewer =
     traceIfFalse "too old snapshot" $
       contestSnapshotNumber > closedSnapshotNumber

From 17e713301f80d6c26874bc96977698be7bcc7eb9 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Wed, 28 Dec 2022 18:15:10 +0100
Subject: [PATCH 21/85] Reduce outputs further

---
 hydra-node/test/Hydra/Chain/Direct/StateSpec.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
index f5aec935e9c..e5f7891cbf8 100644
--- a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
@@ -389,7 +389,7 @@ forAllFanout action =
             & label ("Fanout size: " <> prettyLength (countAssets $ txOuts' tx))
  where
   -- TODO: Can we go back to 70 outputs here?
-  maxSupported = 60
+  maxSupported = 50
 
   countAssets = getSum . foldMap (Sum . valueSize . txOutValue)
 

From 9c42dbb7541176c01391a9a80ce5d55526300efe Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Wed, 28 Dec 2022 19:24:27 +0100
Subject: [PATCH 22/85] Remove traces in head validator and bring back the old
 outputs number for fanout tx

---
 .../test/Hydra/Chain/Direct/StateSpec.hs      |  2 +-
 hydra-plutus/src/Hydra/Contract/Head.hs       | 45 ++++++++-----------
 2 files changed, 20 insertions(+), 27 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
index e5f7891cbf8..2595f0a4bcd 100644
--- a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
@@ -389,7 +389,7 @@ forAllFanout action =
             & label ("Fanout size: " <> prettyLength (countAssets $ txOuts' tx))
  where
   -- TODO: Can we go back to 70 outputs here?
-  maxSupported = 50
+  maxSupported = 70
 
   countAssets = getSum . foldMap (Sum . valueSize . txOutValue)
 
diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index 553912e8c70..7b6ce2dc6ad 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -116,8 +116,7 @@ checkAbort context@ScriptContext{scriptContextTxInfo = txInfo} headCurrencySymbo
     && mustBeSignedByParticipant context headCurrencySymbol
  where
   mustBurnAllHeadTokens =
-    traceIfFalse "number of inputs do not match number of parties" $
-      burntTokens == length parties + 1
+    burntTokens == length parties + 1
 
   minted = getValue $ txInfoMint txInfo
 
@@ -155,13 +154,12 @@ checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headAddress
   mustContinueHeadWith context headAddress expectedChangeValue expectedOutputDatum
     && everyoneHasCommitted
     && mustBeSignedByParticipant context initialHeadPolicyId
-    && traceIfFalse "Head policy id not present in checkCollectCom" (hasSTToken initialHeadPolicyId collectValue)
+    && hasSTToken initialHeadPolicyId collectValue
  where
   collectValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput context
   everyoneHasCommitted =
-    traceIfFalse "not everyone committed" $
-      nTotalCommits == length parties
+    nTotalCommits == length parties
 
   (expectedChangeValue, collectedCommits, nTotalCommits) =
     traverseInputs
@@ -240,9 +238,9 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
   hasBoundedValidity
     && checkSnapshot
     && mustBeSignedByParticipant ctx headPolicyId
-    && traceIfFalse "Head policy id not present in checkClose" (hasSTToken headPolicyId closeValue)
+    && hasSTToken headPolicyId closeValue
  where
-  hasBoundedValidity = traceIfFalse "hasBoundedValidity check failed" $ tMax - tMin <= cp
+  hasBoundedValidity = tMax - tMin <= cp
 
   closeValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
@@ -333,20 +331,19 @@ checkContest ctx@ScriptContext{scriptContextTxInfo} contestationDeadline parties
       (Closed{parties, snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, contestationDeadline, closedHeadPolicyId = headPolicyId})
     && mustBeSignedByParticipant ctx headPolicyId
     && mustBeWithinContestationPeriod
-    && traceIfFalse "Head policy id not present in checkContest" (hasSTToken headPolicyId contestValue)
+    && hasSTToken headPolicyId contestValue
  where
   contestValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
   mustBeNewer =
-    traceIfFalse "too old snapshot" $
-      contestSnapshotNumber > closedSnapshotNumber
+    contestSnapshotNumber > closedSnapshotNumber
 
   mustBeMultiSigned =
     verifySnapshotSignature parties contestSnapshotNumber contestUtxoHash sig
 
   mustBeWithinContestationPeriod =
     case ivTo (txInfoValidRange scriptContextTxInfo) of
-      UpperBound (Finite time) _ -> traceIfFalse "upper bound validity beyond contestation deadline" $ time <= contestationDeadline
+      UpperBound (Finite time) _ -> time <= contestationDeadline
       _ -> traceError "no upper bound validity interval defined for contest"
 {-# INLINEABLE checkContest #-}
 
@@ -358,10 +355,9 @@ checkHeadOutputDatum ctx d =
     NoOutputDatum ->
       traceError "missing datum"
     OutputDatumHash actualHash ->
-      traceIfFalse "output datum hash mismatch" $
-        Just actualHash == expectedHash
+      Just actualHash == expectedHash
     OutputDatum actual ->
-      traceIfFalse "output datum mismatch" $ getDatum actual == expectedData
+      getDatum actual == expectedData
  where
   expectedData = toBuiltinData d
 
@@ -392,13 +388,13 @@ checkFanout ::
 checkFanout utxoHash contestationDeadline numberOfFanoutOutputs ScriptContext{scriptContextTxInfo = txInfo} =
   hasSameUTxOHash && afterContestationDeadline
  where
-  hasSameUTxOHash = traceIfFalse "fannedOutUtxoHash /= closedUtxoHash" $ fannedOutUtxoHash == utxoHash
+  hasSameUTxOHash = fannedOutUtxoHash == utxoHash
   fannedOutUtxoHash = hashTxOuts $ take numberOfFanoutOutputs txInfoOutputs
   TxInfo{txInfoOutputs} = txInfo
 
   afterContestationDeadline =
     case ivFrom (txInfoValidRange txInfo) of
-      LowerBound (Finite time) _ -> traceIfFalse "lower bound validity before contestation deadline" $ time > contestationDeadline
+      LowerBound (Finite time) _ -> time > contestationDeadline
       _ -> traceError "no lower bound validity interval defined for fanout"
 {-# INLINEABLE checkFanout #-}
 
@@ -413,8 +409,7 @@ mustBeSignedByParticipant ::
 mustBeSignedByParticipant ScriptContext{scriptContextTxInfo = txInfo} headCurrencySymbol =
   case getPubKeyHash <$> txInfoSignatories txInfo of
     [signer] ->
-      traceIfFalse "mustBeSignedByParticipant: did not find expected signer" $
-        signer `elem` (unTokenName <$> participationTokens)
+      signer `elem` (unTokenName <$> participationTokens)
     [] ->
       traceError "mustBeSignedByParticipant: no signers"
     _ ->
@@ -445,8 +440,8 @@ mustContinueHeadWith ScriptContext{scriptContextTxInfo = txInfo} headAddress cha
       traceError "no continuing head output"
     (o : rest)
       | txOutAddress o == headAddress ->
-        traceIfFalse "wrong output head datum" (findTxOutDatum txInfo o == datum)
-          && traceIfFalse "wrong output value" (checkOutputValue (xs <> rest))
+        findTxOutDatum txInfo o == datum
+          && checkOutputValue (xs <> rest)
     (o : rest) ->
       checkOutputDatum (o : xs) rest
 
@@ -488,15 +483,13 @@ hashTxOuts =
 
 verifySnapshotSignature :: [Party] -> SnapshotNumber -> BuiltinByteString -> [Signature] -> Bool
 verifySnapshotSignature parties snapshotNumber utxoHash sigs =
-  traceIfFalse "signature verification failed" $
-    length parties == length sigs
-      && all (uncurry $ verifyPartySignature snapshotNumber utxoHash) (zip parties sigs)
+  length parties == length sigs
+    && all (uncurry $ verifyPartySignature snapshotNumber utxoHash) (zip parties sigs)
 {-# INLINEABLE verifySnapshotSignature #-}
 
 verifyPartySignature :: SnapshotNumber -> BuiltinByteString -> Party -> Signature -> Bool
-verifyPartySignature snapshotNumber utxoHash party signed =
-  traceIfFalse "party signature verification failed" $
-    verifyEd25519Signature (vkey party) message signed
+verifyPartySignature snapshotNumber utxoHash party =
+  verifyEd25519Signature (vkey party) message
  where
   message =
     -- TODO: document CDDL format, either here or in 'Hydra.Snapshot.getSignableRepresentation'

From 2f2ad762f28f897deba14b52e82838fe45dbd8ff Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <Sasha.Bogicevic@iohk.io>
Date: Thu, 29 Dec 2022 09:03:26 +0100
Subject: [PATCH 23/85] Remove traces from initial and commit validators

---
 hydra-plutus/src/Hydra/Contract/Commit.hs  |  3 +-
 hydra-plutus/src/Hydra/Contract/Initial.hs | 41 +++-------------------
 2 files changed, 6 insertions(+), 38 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Commit.hs b/hydra-plutus/src/Hydra/Contract/Commit.hs
index f4addd78862..101218d2fd4 100644
--- a/hydra-plutus/src/Hydra/Contract/Commit.hs
+++ b/hydra-plutus/src/Hydra/Contract/Commit.hs
@@ -121,8 +121,7 @@ validator (_party, headScriptHash, commit) consumer ScriptContext{scriptContextT
                         Nothing -> True
                         Just Commit{preSerializedOutput} ->
                           -- There should be an output in the transaction corresponding to this preSerializedOutput
-                          traceIfFalse "cannot find committed output" $
-                            preSerializedOutput `elem` (Builtins.serialiseData . toBuiltinData <$> txInfoOutputs txInfo)
+                          preSerializedOutput `elem` (Builtins.serialiseData . toBuiltinData <$> txInfoOutputs txInfo)
                     -- NOTE: In the Collectcom case the inclusion of the committed output 'commit' is
                     -- delegated to the 'CollectCom' script who has more information to do it.
                     ViaCollectCom -> True
diff --git a/hydra-plutus/src/Hydra/Contract/Initial.hs b/hydra-plutus/src/Hydra/Contract/Initial.hs
index 5800a3b1ecd..2e708480a68 100644
--- a/hydra-plutus/src/Hydra/Contract/Initial.hs
+++ b/hydra-plutus/src/Hydra/Contract/Initial.hs
@@ -10,7 +10,6 @@ import PlutusTx.Prelude
 import Hydra.Contract.Commit (Commit (..))
 import qualified Hydra.Contract.Commit as Commit
 import Plutus.Extras (ValidatorType, scriptValidatorHash, wrapValidator)
-import Plutus.V1.Ledger.Value (assetClass, assetClassValueOf)
 import Plutus.V2.Ledger.Api (
   CurrencySymbol,
   Datum (..),
@@ -29,8 +28,6 @@ import Plutus.V2.Ledger.Api (
   Validator (getValidator),
   ValidatorHash,
   Value (getValue),
-  adaSymbol,
-  adaToken,
   mkValidatorScript,
  )
 import Plutus.V2.Ledger.Contexts (findDatum, findOwnInput, findTxInByTxOutRef, scriptOutputsAt, valueLockedBy)
@@ -88,10 +85,8 @@ checkAuthorAndHeadPolicy ::
   CurrencySymbol ->
   Bool
 checkAuthorAndHeadPolicy context@ScriptContext{scriptContextTxInfo = txInfo} headPolicyId =
-  traceIfFalse
-    "Missing or invalid commit author"
-    (unTokenName ourParticipationTokenName `elem` (getPubKeyHash <$> txInfoSignatories txInfo))
-    && traceIfFalse "Invalid policy id" (policyId == headPolicyId)
+  unTokenName ourParticipationTokenName `elem` (getPubKeyHash <$> txInfoSignatories txInfo)
+    && policyId == headPolicyId
  where
   (policyId, ourParticipationTokenName) =
     case AssocMap.toList (getValue initialValue) of
@@ -115,11 +110,7 @@ checkCommit commitValidator committedRef context@ScriptContext{scriptContextTxIn
   checkCommittedValue && checkLockedCommit
  where
   checkCommittedValue =
-    traceIfFalse "lockedValue does not match" $
-      traceIfFalse ("lockedValue: " `appendString` debugValue lockedValue) $
-        traceIfFalse ("initialValue: " `appendString` debugValue initialValue) $
-          traceIfFalse ("comittedValue: " `appendString` debugValue committedValue) $
-            lockedValue == initialValue + committedValue
+    lockedValue == initialValue + committedValue
 
   checkLockedCommit =
     case (committedTxOut, lockedCommit) of
@@ -130,9 +121,8 @@ checkCommit commitValidator committedRef context@ScriptContext{scriptContextTxIn
       (Just{}, Nothing) ->
         traceError "committed TxOut, but nothing in output datum"
       (Just (ref, txOut), Just Commit{input, preSerializedOutput}) ->
-        traceIfFalse "mismatch committed TxOut in datum" $
-          Builtins.serialiseData (toBuiltinData txOut) == preSerializedOutput
-            && ref == input
+        Builtins.serialiseData (toBuiltinData txOut) == preSerializedOutput
+          && ref == input
 
   initialValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput context
@@ -162,27 +152,6 @@ checkCommit commitValidator committedRef context@ScriptContext{scriptContextTxIn
                     mCommit
       _ -> traceError "expected single commit output"
 
-  debugValue v =
-    debugInteger . assetClassValueOf v $ assetClass adaSymbol adaToken
-
--- | Show an 'Integer' as decimal number. This is very inefficient and only
--- should be used for debugging.
-debugInteger :: Integer -> BuiltinString
-debugInteger i
-  | i == 0 = "0"
-  | i == 1 = "1"
-  | i == 2 = "2"
-  | i == 3 = "3"
-  | i == 4 = "4"
-  | i == 5 = "5"
-  | i == 6 = "6"
-  | i == 7 = "7"
-  | i == 8 = "8"
-  | i == 9 = "9"
-  | i >= 10 = debugInteger (i `quotient` 10) `appendString` "0"
-  | otherwise = "-" `appendString` debugInteger (negate i)
-{-# INLINEABLE debugInteger #-}
-
 compiledValidator :: CompiledCode ValidatorType
 compiledValidator =
   $$(PlutusTx.compile [||wrap . validator||])

From 44f2e5e5eed546cebc265fdcdf55a5af9f538f33 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 29 Dec 2022 10:35:55 +0100
Subject: [PATCH 24/85] Remove a TODO

---
 hydra-node/test/Hydra/Chain/Direct/StateSpec.hs | 1 -
 1 file changed, 1 deletion(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
index 2595f0a4bcd..35f8a96c7c6 100644
--- a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
@@ -388,7 +388,6 @@ forAllFanout action =
        in action utxo tx
             & label ("Fanout size: " <> prettyLength (countAssets $ txOuts' tx))
  where
-  -- TODO: Can we go back to 70 outputs here?
   maxSupported = 70
 
   countAssets = getSum . foldMap (Sum . valueSize . txOutValue)

From b3777abf7c89d5dced7bad466f49f6f9b9d4af6f Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 29 Dec 2022 10:39:06 +0100
Subject: [PATCH 25/85] Rename MutatePolicyId to MutateHeadId

---
 hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs  | 4 ++--
 hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index d49853d7468..7ff76267d6f 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -151,7 +151,7 @@ data CloseMutation
   | MutateValidityInterval
   | MutateCloseContestationDeadline
   | MutateCloseContestationDeadlineWithZero
-  | MutatePolicyId
+  | MutateHeadId
   deriving (Generic, Show, Enum, Bounded)
 
 genCloseMutation :: (Tx, UTxO) -> Gen SomeMutation
@@ -201,7 +201,7 @@ genCloseMutation (tx, _utxo) =
         lb <- arbitrary
         ub <- (lb -) <$> choose (0, lb)
         pure (TxValidityLowerBound (SlotNo lb), TxValidityUpperBound (SlotNo ub))
-    , SomeMutation MutatePolicyId <$> do
+    , SomeMutation MutateHeadId <$> do
         otherHeadId <- headPolicyId <$> arbitrary `suchThat` (/= Fixture.testSeedInput)
         let closeTxOuts = txOuts' tx
         pure $
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
index 86ed48b639a..f5708028c4c 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
@@ -75,7 +75,7 @@ data CommitMutation
   | MutateCommittedAddress
   | MutateRequiredSigner
   | -- | Change the policy Id of the PT both in input and output
-    MutatePolicyId
+    MutateHeadId
   deriving (Generic, Show, Enum, Bounded)
 
 genCommitMutation :: (Tx, UTxO) -> Gen SomeMutation
@@ -96,7 +96,7 @@ genCommitMutation (tx, _utxo) =
     , SomeMutation MutateRequiredSigner <$> do
         newSigner <- verificationKeyHash <$> genVerificationKey
         pure $ ChangeRequiredSigners [newSigner]
-    , SomeMutation MutatePolicyId <$> do
+    , SomeMutation MutateHeadId <$> do
         otherHeadId <- fmap headPolicyId (arbitrary `suchThat` (/= Fixture.testSeedInput))
         pure $
           Changes

From d958debe0283441576689115dcc9325484179264 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 29 Dec 2022 11:04:40 +0100
Subject: [PATCH 26/85] Add Mutation test for contest txs

---
 .../Hydra/Chain/Direct/Contract/Contest.hs    | 37 +++++++++++++------
 1 file changed, 25 insertions(+), 12 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
index 9e428198d8f..dbc861931e2 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
@@ -16,9 +16,10 @@ import Hydra.Chain.Direct.Contract.Mutation (
   addParticipationTokens,
   changeHeadOutputDatum,
   genHash,
+  replacePolicyIdWith,
  )
-import Hydra.Chain.Direct.Fixture (genForParty, testNetworkId, testPolicyId)
-import Hydra.Chain.Direct.Tx (ClosedThreadOutput (..), contestTx, mkHeadId, mkHeadOutput)
+import Hydra.Chain.Direct.Fixture (genForParty, testNetworkId, testPolicyId, testSeedInput)
+import Hydra.Chain.Direct.Tx (ClosedThreadOutput (..), contestTx, headPolicyId, mkHeadId, mkHeadOutput)
 import qualified Hydra.Contract.HeadState as Head
 import Hydra.Crypto (HydraKey, MultiSignature, aggregate, sign, toPlutusSignatures)
 import Hydra.Data.ContestationPeriod (posixFromUTCTime)
@@ -52,26 +53,26 @@ healthyContestTx =
       closedThreadOutput
       (mkHeadId testPolicyId)
 
-  headInput = generateWith arbitrary 42
-
-  headResolvedInput =
-    mkHeadOutput testNetworkId testPolicyId headTxOutDatum
-      & addParticipationTokens healthyParties
-
-  headTxOutDatum = toUTxOContext (mkTxOutDatum healthyClosedState)
-
   headDatum = fromPlutusData $ toData healthyClosedState
 
-  lookupUTxO = UTxO.singleton (headInput, headResolvedInput)
+  lookupUTxO = UTxO.singleton (testSeedInput, headResolvedInput)
 
   closedThreadOutput =
     ClosedThreadOutput
-      { closedThreadUTxO = (headInput, headResolvedInput, headDatum)
+      { closedThreadUTxO = (testSeedInput, headResolvedInput, headDatum)
       , closedParties =
           healthyOnChainParties
       , closedContestationDeadline = posixFromUTCTime healthyContestationDeadline
       }
 
+headTxOutDatum :: TxOutDatum CtxUTxO
+headTxOutDatum = toUTxOContext (mkTxOutDatum healthyClosedState)
+
+headResolvedInput :: TxOut CtxUTxO
+headResolvedInput =
+  mkHeadOutput testNetworkId testPolicyId headTxOutDatum
+    & addParticipationTokens healthyParties
+
 healthyContestSnapshot :: Snapshot Tx
 healthyContestSnapshot =
   Snapshot
@@ -159,6 +160,8 @@ data ContestMutation
   | -- | Change the validity interval of the transaction to a value greater
     -- than the contestation deadline
     MutateValidityPastDeadline
+  | -- | Change the head policy id to test the head validators
+    MutateHeadId
   deriving (Generic, Show, Enum, Bounded)
 
 genContestMutation :: (Tx, UTxO) -> Gen SomeMutation
@@ -204,6 +207,16 @@ genContestMutation
           lb <- arbitrary
           ub <- TxValidityUpperBound <$> arbitrary `suchThat` slotOverContestationDeadline
           pure (lb, ub)
+      , SomeMutation MutateHeadId <$> do
+          otherHeadId <- fmap headPolicyId (arbitrary `suchThat` (/= testSeedInput))
+          pure $
+            Changes
+              [ ChangeOutput 0 (replacePolicyIdWith testPolicyId otherHeadId headTxOut)
+              , ChangeInput
+                  testSeedInput
+                  (replacePolicyIdWith testPolicyId otherHeadId headResolvedInput)
+                  Nothing
+              ]
       ]
    where
     headTxOut = fromJust $ txOuts' tx !!? 0

From 34c5d45815589da86703f632a41a2bb3da5be323 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 29 Dec 2022 11:10:29 +0100
Subject: [PATCH 27/85] Fix the mutation test for contest txs

---
 hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
index dbc861931e2..4768f47294e 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
@@ -215,7 +215,7 @@ genContestMutation
               , ChangeInput
                   testSeedInput
                   (replacePolicyIdWith testPolicyId otherHeadId headResolvedInput)
-                  Nothing
+                  (Just $ toScriptData healthyClosedState)
               ]
       ]
    where

From c5d7dd3376115694b4f61d7f109c499a829e7a6e Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 29 Dec 2022 11:12:34 +0100
Subject: [PATCH 28/85] Rename head state head id fields

---
 hydra-node/src/Hydra/Chain/Direct/Tx.hs       |  6 ++--
 .../test/Hydra/Chain/Direct/Contract/Close.hs | 10 +++----
 .../Hydra/Chain/Direct/Contract/CollectCom.hs | 10 +++----
 .../Hydra/Chain/Direct/Contract/Contest.hs    |  6 ++--
 .../Hydra/Chain/Direct/Contract/FanOut.hs     |  2 +-
 hydra-plutus/src/Hydra/Contract/Head.hs       | 28 +++++++++----------
 hydra-plutus/src/Hydra/Contract/HeadState.hs  |  6 ++--
 7 files changed, 34 insertions(+), 34 deletions(-)

diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index d7784b889b0..5586d333924 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -269,7 +269,7 @@ collectComTx networkId vk initialThreadOutput commits (HeadId headId) =
         { Head.parties = initialParties
         , utxoHash
         , contestationPeriod = initialContestationPeriod
-        , openHeadPolicyId = CurrencySymbol $ toBuiltin headId
+        , openHeadId = CurrencySymbol $ toBuiltin headId
         }
 
   extractCommit d =
@@ -362,7 +362,7 @@ closeTx vk closing startSlotNo (endSlotNo, utcTime) openThreadOutput (HeadId hea
         , utxoHash = toBuiltin utxoHashBytes
         , parties = openParties
         , contestationDeadline
-        , closedHeadPolicyId = CurrencySymbol $ toBuiltin headId
+        , closedHeadId = CurrencySymbol $ toBuiltin headId
         }
 
   snapshotNumber = toInteger $ case closing of
@@ -426,7 +426,7 @@ contestTx vk Snapshot{number, utxo} sig (slotNo, _) ClosedThreadOutput{closedThr
         , utxoHash
         , parties = closedParties
         , contestationDeadline = closedContestationDeadline
-        , closedHeadPolicyId = CurrencySymbol $ toBuiltin headId
+        , closedHeadId = CurrencySymbol $ toBuiltin headId
         }
   utxoHash = toBuiltin $ hashUTxO @Tx utxo
 
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index 7ff76267d6f..219778da5c5 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -111,7 +111,7 @@ healthyCloseDatum =
     { parties = healthyOnChainParties
     , utxoHash = toBuiltin $ hashUTxO @Tx healthyUTxO
     , contestationPeriod = healthyContestationPeriod
-    , openHeadPolicyId = toPlutusPolicyId Fixture.testPolicyId
+    , openHeadId = toPlutusPolicyId Fixture.testPolicyId
     }
 
 healthyContestationPeriod :: OnChain.ContestationPeriod
@@ -183,7 +183,7 @@ genCloseMutation (tx, _utxo) =
             { parties = mutatedParties
             , utxoHash = ""
             , contestationPeriod = healthyContestationPeriod
-            , openHeadPolicyId = toPlutusPolicyId Fixture.testPolicyId
+            , openHeadId = toPlutusPolicyId Fixture.testPolicyId
             }
     , SomeMutation MutateRequiredSigner <$> do
         newSigner <- verificationKeyHash <$> genVerificationKey
@@ -236,13 +236,13 @@ genCloseMutation (tx, _utxo) =
     pure $ changeHeadOutputDatum (mutateHash mutatedUTxOHash) headTxOut
 
   mutateHash mutatedUTxOHash = \case
-    Head.Closed{snapshotNumber, parties, contestationDeadline, closedHeadPolicyId} ->
+    Head.Closed{snapshotNumber, parties, contestationDeadline, closedHeadId} ->
       Head.Closed
         { snapshotNumber
         , utxoHash = toBuiltin mutatedUTxOHash
         , parties
         , contestationDeadline
-        , closedHeadPolicyId
+        , closedHeadId
         }
     st -> error $ "unexpected state " <> show st
   -- In case contestation period param is 'Nothing' we will generate arbitrary value
@@ -261,6 +261,6 @@ genCloseMutation (tx, _utxo) =
         , contestationDeadline =
             let closingTime = slotNoToUTCTime healthySlotNo
              in posixFromUTCTime $ addUTCTime (fromInteger contestationPeriod) closingTime
-        , closedHeadPolicyId = toPlutusPolicyId Fixture.testPolicyId
+        , closedHeadId = toPlutusPolicyId Fixture.testPolicyId
         }
     st -> error $ "unexpected state " <> show st
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
index 2bac6af661a..e6f2e02c1cf 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
@@ -107,7 +107,7 @@ healthyCollectComInitialDatum =
   Head.Initial
     { contestationPeriod = healthyContestationPeriod
     , parties = healthyOnChainParties
-    , initialHeadPolicyId = toPlutusPolicyId testPolicyId
+    , initialHeadId = toPlutusPolicyId testPolicyId
     }
 
 healthyOnChainParties :: [OnChain.Party]
@@ -202,8 +202,8 @@ genCollectComMutation (tx, utxo) =
 
   mutatedPartiesHeadTxOut parties =
     changeHeadOutputDatum $ \case
-      Head.Open{utxoHash, contestationPeriod, openHeadPolicyId} ->
-        Head.Open{Head.parties = parties, contestationPeriod, utxoHash, openHeadPolicyId}
+      Head.Open{utxoHash, contestationPeriod, openHeadId} ->
+        Head.Open{Head.parties = parties, contestationPeriod, utxoHash, openHeadId}
       st -> error $ "Unexpected state " <> show st
 
   mutateUTxOHash = do
@@ -211,6 +211,6 @@ genCollectComMutation (tx, utxo) =
     pure $ changeHeadOutputDatum (mutateState mutatedUTxOHash) headTxOut
 
   mutateState mutatedUTxOHash = \case
-    Head.Open{parties, contestationPeriod, openHeadPolicyId} ->
-      Head.Open{parties, contestationPeriod, Head.utxoHash = toBuiltin mutatedUTxOHash, openHeadPolicyId}
+    Head.Open{parties, contestationPeriod, openHeadId} ->
+      Head.Open{parties, contestationPeriod, Head.utxoHash = toBuiltin mutatedUTxOHash, openHeadId}
     st -> st
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
index 4768f47294e..cebe33d607e 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
@@ -100,7 +100,7 @@ healthyClosedState =
     , utxoHash = healthyClosedUTxOHash
     , parties = healthyOnChainParties
     , contestationDeadline = posixFromUTCTime healthyContestationDeadline
-    , closedHeadPolicyId = toPlutusPolicyId testPolicyId
+    , closedHeadId = toPlutusPolicyId testPolicyId
     }
 
 healthySlotNo :: SlotNo
@@ -201,7 +201,7 @@ genContestMutation
               , utxoHash = healthyClosedUTxOHash
               , snapshotNumber = fromIntegral healthyClosedSnapshotNumber
               , contestationDeadline = arbitrary `generateWith` 42
-              , closedHeadPolicyId = toPlutusPolicyId testPolicyId
+              , closedHeadId = toPlutusPolicyId testPolicyId
               }
       , SomeMutation MutateValidityPastDeadline . ChangeValidityInterval <$> do
           lb <- arbitrary
@@ -232,7 +232,7 @@ genContestMutation
                 , utxoHash = toBuiltin mutatedUTxOHash
                 , parties = healthyOnChainParties
                 , contestationDeadline = arbitrary `generateWith` 42
-                , closedHeadPolicyId = toPlutusPolicyId testPolicyId
+                , closedHeadId = toPlutusPolicyId testPolicyId
                 }
           )
           headTxOut
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
index 575da24d1af..0e9122b0c2d 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
@@ -80,7 +80,7 @@ healthyFanoutDatum =
     , utxoHash = toBuiltin $ hashUTxO @Tx healthyFanoutUTxO
     , parties = partyToChain <$> arbitrary `generateWith` 42
     , contestationDeadline = posixFromUTCTime healthyContestationDeadline
-    , closedHeadPolicyId = toPlutusPolicyId testPolicyId
+    , closedHeadId = toPlutusPolicyId testPolicyId
     }
 
 data FanoutMutation
diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index 7b6ce2dc6ad..773d2891cd9 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -66,12 +66,12 @@ headValidator oldState input context =
   case (oldState, input) of
     (initialState@Initial{}, CollectCom) ->
       checkCollectCom context (mkHeadAddress context) initialState
-    (Initial{parties, initialHeadPolicyId}, Abort) ->
-      checkAbort context initialHeadPolicyId parties
-    (Open{parties, utxoHash = initialUtxoHash, contestationPeriod, openHeadPolicyId}, Close{snapshotNumber, utxoHash = closedUtxoHash, signature}) ->
-      checkClose context parties initialUtxoHash snapshotNumber closedUtxoHash signature contestationPeriod openHeadPolicyId
-    (Closed{parties, snapshotNumber = closedSnapshotNumber, contestationDeadline, closedHeadPolicyId}, Contest{snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, signature}) ->
-      checkContest context contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash signature closedHeadPolicyId
+    (Initial{parties, initialHeadId}, Abort) ->
+      checkAbort context initialHeadId parties
+    (Open{parties, utxoHash = initialUtxoHash, contestationPeriod, openHeadId}, Close{snapshotNumber, utxoHash = closedUtxoHash, signature}) ->
+      checkClose context parties initialUtxoHash snapshotNumber closedUtxoHash signature contestationPeriod openHeadId
+    (Closed{parties, snapshotNumber = closedSnapshotNumber, contestationDeadline, closedHeadId}, Contest{snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, signature}) ->
+      checkContest context contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash signature closedHeadId
     (Closed{utxoHash, contestationDeadline}, Fanout{numberOfFanoutOutputs}) ->
       checkFanout utxoHash contestationDeadline numberOfFanoutOutputs context
     _ ->
@@ -150,11 +150,11 @@ checkCollectCom ::
   -- | Initial state
   State ->
   Bool
-checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headAddress Initial{contestationPeriod, parties, initialHeadPolicyId} =
+checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headAddress Initial{contestationPeriod, parties, initialHeadId} =
   mustContinueHeadWith context headAddress expectedChangeValue expectedOutputDatum
     && everyoneHasCommitted
-    && mustBeSignedByParticipant context initialHeadPolicyId
-    && hasSTToken initialHeadPolicyId collectValue
+    && mustBeSignedByParticipant context initialHeadId
+    && hasSTToken initialHeadId collectValue
  where
   collectValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput context
@@ -169,7 +169,7 @@ checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headAddress
   expectedOutputDatum :: Datum
   expectedOutputDatum =
     let utxoHash = hashPreSerializedCommits collectedCommits
-     in Datum $ toBuiltinData Open{parties, utxoHash, contestationPeriod, openHeadPolicyId = initialHeadPolicyId}
+     in Datum $ toBuiltinData Open{parties, utxoHash, contestationPeriod, openHeadId = initialHeadId}
 
   -- Collect fuel and commits from resolved inputs. Any output containing a PT
   -- is treated as a commit, "our" output is the head output and all remaining
@@ -200,7 +200,7 @@ checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headAddress
   isHeadOutput txOut = txOutAddress txOut == headAddress
 
   hasPT txOut =
-    let pts = findParticipationTokens initialHeadPolicyId (txOutValue txOut)
+    let pts = findParticipationTokens initialHeadId (txOutValue txOut)
      in length pts == 1
 
   commitDatum :: TxOut -> Maybe Commit
@@ -253,7 +253,7 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
               , snapshotNumber = 0
               , utxoHash = initialUtxoHash
               , contestationDeadline = makeContestationDeadline cperiod ctx
-              , closedHeadPolicyId = headPolicyId
+              , closedHeadId = headPolicyId
               }
        in checkHeadOutputDatum ctx expectedOutputDatum
     | snapshotNumber > 0 =
@@ -263,7 +263,7 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
               , snapshotNumber
               , utxoHash = closedUtxoHash
               , contestationDeadline = makeContestationDeadline cperiod ctx
-              , closedHeadPolicyId = headPolicyId
+              , closedHeadId = headPolicyId
               }
        in verifySnapshotSignature parties snapshotNumber closedUtxoHash sig
             && checkHeadOutputDatum ctx expectedOutputDatum
@@ -328,7 +328,7 @@ checkContest ctx@ScriptContext{scriptContextTxInfo} contestationDeadline parties
     && mustBeMultiSigned
     && checkHeadOutputDatum
       ctx
-      (Closed{parties, snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, contestationDeadline, closedHeadPolicyId = headPolicyId})
+      (Closed{parties, snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, contestationDeadline, closedHeadId = headPolicyId})
     && mustBeSignedByParticipant ctx headPolicyId
     && mustBeWithinContestationPeriod
     && hasSTToken headPolicyId contestValue
diff --git a/hydra-plutus/src/Hydra/Contract/HeadState.hs b/hydra-plutus/src/Hydra/Contract/HeadState.hs
index 033239fea42..906d6d9ccdb 100644
--- a/hydra-plutus/src/Hydra/Contract/HeadState.hs
+++ b/hydra-plutus/src/Hydra/Contract/HeadState.hs
@@ -24,20 +24,20 @@ data State
   = Initial
       { contestationPeriod :: ContestationPeriod
       , parties :: [Party]
-      , initialHeadPolicyId :: CurrencySymbol
+      , initialHeadId :: CurrencySymbol
       }
   | Open
       { contestationPeriod :: ContestationPeriod
       , parties :: [Party]
       , utxoHash :: Hash
-      , openHeadPolicyId :: CurrencySymbol
+      , openHeadId :: CurrencySymbol
       }
   | Closed
       { parties :: [Party]
       , snapshotNumber :: SnapshotNumber
       , utxoHash :: Hash
       , contestationDeadline :: POSIXTime
-      , closedHeadPolicyId :: CurrencySymbol
+      , closedHeadId :: CurrencySymbol
       }
   | Final
   deriving stock (Generic, Show)

From 4f82a29d689189071b84930670f46807c8bc4e1f Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 29 Dec 2022 11:28:34 +0100
Subject: [PATCH 29/85] Cleanup

---
 hydra-plutus/src/Hydra/Contract/Head.hs | 129 ++++++++++++------------
 1 file changed, 64 insertions(+), 65 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index 773d2891cd9..e2b7f2bd5f9 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -56,6 +56,10 @@ type RedeemerType = Input
 hydraHeadV1 :: BuiltinByteString
 hydraHeadV1 = "HydraHeadV1"
 
+--------------------------------------------------------------------------------
+-- Validators
+--------------------------------------------------------------------------------
+
 {-# INLINEABLE headValidator #-}
 headValidator ::
   State ->
@@ -77,27 +81,6 @@ headValidator oldState input context =
     _ ->
       traceError "invalid head state transition"
 
-data CheckCollectComError
-  = NoContinuingOutput
-  | MoreThanOneContinuingOutput
-  | OutputValueNotPreserved
-  | OutputHashNotMatching
-
-mkHeadAddress :: ScriptContext -> Address
-mkHeadAddress context =
-  headAddress
- where
-  headInput :: TxInInfo
-  headInput =
-    fromMaybe
-      (traceError "script not spending a head input?")
-      (findOwnInput context)
-
-  headAddress :: Address
-  headAddress =
-    txOutAddress (txInInfoResolved headInput)
-{-# INLINEABLE mkHeadAddress #-}
-
 -- | On-Chain verification for 'Abort' transition. It verifies that:
 --
 --   * All PTs have been burnt: The right number of Head tokens, both PT for
@@ -154,9 +137,9 @@ checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headAddress
   mustContinueHeadWith context headAddress expectedChangeValue expectedOutputDatum
     && everyoneHasCommitted
     && mustBeSignedByParticipant context initialHeadId
-    && hasSTToken initialHeadId collectValue
+    && hasSTToken initialHeadId outValue
  where
-  collectValue =
+  outValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput context
   everyoneHasCommitted =
     nTotalCommits == length parties
@@ -238,11 +221,11 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
   hasBoundedValidity
     && checkSnapshot
     && mustBeSignedByParticipant ctx headPolicyId
-    && hasSTToken headPolicyId closeValue
+    && hasSTToken headPolicyId outValue
  where
   hasBoundedValidity = tMax - tMin <= cp
 
-  closeValue =
+  outValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
 
   checkSnapshot
@@ -282,24 +265,6 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
   ScriptContext{scriptContextTxInfo = txInfo} = ctx
 {-# INLINEABLE checkClose #-}
 
-hasSTToken :: CurrencySymbol -> Value -> Bool
-hasSTToken headPolicyId v =
-  isJust $
-    find
-      (\(cs, tokenMap) -> cs == headPolicyId && hasHydraToken tokenMap)
-      (Map.toList $ getValue v)
- where
-  hasHydraToken tm =
-    isJust $ find (\(tn, q) -> q == 1 && TokenName hydraHeadV1 == tn) (Map.toList tm)
-{-# INLINEABLE hasSTToken #-}
-
-makeContestationDeadline :: ContestationPeriod -> ScriptContext -> POSIXTime
-makeContestationDeadline cperiod ScriptContext{scriptContextTxInfo} =
-  case ivTo (txInfoValidRange scriptContextTxInfo) of
-    UpperBound (Finite time) _ -> addContestationPeriod time cperiod
-    _ -> traceError "no upper bound validaty interval defined for close"
-{-# INLINEABLE makeContestationDeadline #-}
-
 -- | The contest validator must verify that:
 --
 --   * The contest snapshot number is strictly greater than the closed snapshot number.
@@ -309,6 +274,7 @@ makeContestationDeadline cperiod ScriptContext{scriptContextTxInfo} =
 --   * The resulting closed state is consistent with the contested snapshot.
 --
 --   * The transaction is performed (i.e. signed) by one of the head participants
+--   * ST token is present in the output
 checkContest ::
   ScriptContext ->
   POSIXTime ->
@@ -331,9 +297,9 @@ checkContest ctx@ScriptContext{scriptContextTxInfo} contestationDeadline parties
       (Closed{parties, snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, contestationDeadline, closedHeadId = headPolicyId})
     && mustBeSignedByParticipant ctx headPolicyId
     && mustBeWithinContestationPeriod
-    && hasSTToken headPolicyId contestValue
+    && hasSTToken headPolicyId outValue
  where
-  contestValue =
+  outValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
   mustBeNewer =
     contestSnapshotNumber > closedSnapshotNumber
@@ -347,6 +313,33 @@ checkContest ctx@ScriptContext{scriptContextTxInfo} contestationDeadline parties
       _ -> traceError "no upper bound validity interval defined for contest"
 {-# INLINEABLE checkContest #-}
 
+checkFanout ::
+  BuiltinByteString ->
+  POSIXTime ->
+  Integer ->
+  ScriptContext ->
+  Bool
+checkFanout utxoHash contestationDeadline numberOfFanoutOutputs ScriptContext{scriptContextTxInfo = txInfo} =
+  hasSameUTxOHash && afterContestationDeadline
+ where
+  hasSameUTxOHash = fannedOutUtxoHash == utxoHash
+  fannedOutUtxoHash = hashTxOuts $ take numberOfFanoutOutputs txInfoOutputs
+  TxInfo{txInfoOutputs} = txInfo
+
+  afterContestationDeadline =
+    case ivFrom (txInfoValidRange txInfo) of
+      LowerBound (Finite time) _ -> time > contestationDeadline
+      _ -> traceError "no lower bound validity interval defined for fanout"
+{-# INLINEABLE checkFanout #-}
+
+--------------------------------------------------------------------------------
+-- Helpers
+--------------------------------------------------------------------------------
+
+(&) :: a -> (a -> b) -> b
+(&) = flip ($)
+{-# INLINEABLE (&) #-}
+
 -- | Check that the output datum of this script corresponds to an expected
 -- value. Takes care of resolving datum hashes and inline datums.
 checkHeadOutputDatum :: ToData a => ScriptContext -> a -> Bool
@@ -379,28 +372,34 @@ txInfoAdaFee :: TxInfo -> Integer
 txInfoAdaFee tx = valueOf (txInfoFee tx) adaSymbol adaToken
 {-# INLINEABLE txInfoAdaFee #-}
 
-checkFanout ::
-  BuiltinByteString ->
-  POSIXTime ->
-  Integer ->
-  ScriptContext ->
-  Bool
-checkFanout utxoHash contestationDeadline numberOfFanoutOutputs ScriptContext{scriptContextTxInfo = txInfo} =
-  hasSameUTxOHash && afterContestationDeadline
- where
-  hasSameUTxOHash = fannedOutUtxoHash == utxoHash
-  fannedOutUtxoHash = hashTxOuts $ take numberOfFanoutOutputs txInfoOutputs
-  TxInfo{txInfoOutputs} = txInfo
+makeContestationDeadline :: ContestationPeriod -> ScriptContext -> POSIXTime
+makeContestationDeadline cperiod ScriptContext{scriptContextTxInfo} =
+  case ivTo (txInfoValidRange scriptContextTxInfo) of
+    UpperBound (Finite time) _ -> addContestationPeriod time cperiod
+    _ -> traceError "no upper bound validaty interval defined for close"
+{-# INLINEABLE makeContestationDeadline #-}
 
-  afterContestationDeadline =
-    case ivFrom (txInfoValidRange txInfo) of
-      LowerBound (Finite time) _ -> time > contestationDeadline
-      _ -> traceError "no lower bound validity interval defined for fanout"
-{-# INLINEABLE checkFanout #-}
+-- | Checks that the output contains the ST token with the head 'CurrencySymbol'
+-- and 'TokenName' of 'hydraHeadV1'
+hasSTToken :: CurrencySymbol -> Value -> Bool
+hasSTToken headPolicyId v =
+  isJust $
+    find
+      (\(cs, tokenMap) -> cs == headPolicyId && hasHydraToken tokenMap)
+      (Map.toList $ getValue v)
+ where
+  hasHydraToken tm =
+    isJust $ find (\(tn, q) -> q == 1 && TokenName hydraHeadV1 == tn) (Map.toList tm)
+{-# INLINEABLE hasSTToken #-}
 
-(&) :: a -> (a -> b) -> b
-(&) = flip ($)
-{-# INLINEABLE (&) #-}
+mkHeadAddress :: ScriptContext -> Address
+mkHeadAddress context =
+  let headInput =
+        fromMaybe
+          (traceError "script not spending a head input?")
+          (findOwnInput context)
+   in txOutAddress (txInInfoResolved headInput)
+{-# INLINEABLE mkHeadAddress #-}
 
 mustBeSignedByParticipant ::
   ScriptContext ->

From 1a8282c1d666685dc9bb6f769abeea8c9467bab4 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 29 Dec 2022 11:51:50 +0100
Subject: [PATCH 30/85] Add ST check for abort validator too

---
 hydra-plutus/src/Hydra/Contract/Head.hs | 32 ++++++++++++++-----------
 1 file changed, 18 insertions(+), 14 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index e2b7f2bd5f9..6769547ef64 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -66,18 +66,18 @@ headValidator ::
   Input ->
   ScriptContext ->
   Bool
-headValidator oldState input context =
+headValidator oldState input ctx =
   case (oldState, input) of
     (initialState@Initial{}, CollectCom) ->
-      checkCollectCom context (mkHeadAddress context) initialState
+      checkCollectCom ctx (mkHeadAddress ctx) initialState
     (Initial{parties, initialHeadId}, Abort) ->
-      checkAbort context initialHeadId parties
+      checkAbort ctx initialHeadId parties
     (Open{parties, utxoHash = initialUtxoHash, contestationPeriod, openHeadId}, Close{snapshotNumber, utxoHash = closedUtxoHash, signature}) ->
-      checkClose context parties initialUtxoHash snapshotNumber closedUtxoHash signature contestationPeriod openHeadId
+      checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash signature contestationPeriod openHeadId
     (Closed{parties, snapshotNumber = closedSnapshotNumber, contestationDeadline, closedHeadId}, Contest{snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, signature}) ->
-      checkContest context contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash signature closedHeadId
+      checkContest ctx contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash signature closedHeadId
     (Closed{utxoHash, contestationDeadline}, Fanout{numberOfFanoutOutputs}) ->
-      checkFanout utxoHash contestationDeadline numberOfFanoutOutputs context
+      checkFanout utxoHash contestationDeadline numberOfFanoutOutputs ctx
     _ ->
       traceError "invalid head state transition"
 
@@ -94,10 +94,14 @@ checkAbort ::
   CurrencySymbol ->
   [Party] ->
   Bool
-checkAbort context@ScriptContext{scriptContextTxInfo = txInfo} headCurrencySymbol parties =
+checkAbort ctx@ScriptContext{scriptContextTxInfo = txInfo} headCurrencySymbol parties =
   mustBurnAllHeadTokens
-    && mustBeSignedByParticipant context headCurrencySymbol
+    && mustBeSignedByParticipant ctx headCurrencySymbol
+    && hasSTToken headCurrencySymbol outValue
  where
+  outValue =
+    maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
+
   mustBurnAllHeadTokens =
     burntTokens == length parties + 1
 
@@ -133,14 +137,14 @@ checkCollectCom ::
   -- | Initial state
   State ->
   Bool
-checkCollectCom context@ScriptContext{scriptContextTxInfo = txInfo} headAddress Initial{contestationPeriod, parties, initialHeadId} =
-  mustContinueHeadWith context headAddress expectedChangeValue expectedOutputDatum
+checkCollectCom ctx@ScriptContext{scriptContextTxInfo = txInfo} headAddress Initial{contestationPeriod, parties, initialHeadId} =
+  mustContinueHeadWith ctx headAddress expectedChangeValue expectedOutputDatum
     && everyoneHasCommitted
-    && mustBeSignedByParticipant context initialHeadId
+    && mustBeSignedByParticipant ctx initialHeadId
     && hasSTToken initialHeadId outValue
  where
   outValue =
-    maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput context
+    maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
   everyoneHasCommitted =
     nTotalCommits == length parties
 
@@ -393,11 +397,11 @@ hasSTToken headPolicyId v =
 {-# INLINEABLE hasSTToken #-}
 
 mkHeadAddress :: ScriptContext -> Address
-mkHeadAddress context =
+mkHeadAddress ctx =
   let headInput =
         fromMaybe
           (traceError "script not spending a head input?")
-          (findOwnInput context)
+          (findOwnInput ctx)
    in txOutAddress (txInInfoResolved headInput)
 {-# INLINEABLE mkHeadAddress #-}
 

From fe236ef244578362c2b397c8c5d0a48253d04d0d Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 29 Dec 2022 11:53:31 +0100
Subject: [PATCH 31/85] Remove abort check, ST is burned

---
 hydra-plutus/src/Hydra/Contract/Head.hs | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index 6769547ef64..d09dfaa5e21 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -97,11 +97,7 @@ checkAbort ::
 checkAbort ctx@ScriptContext{scriptContextTxInfo = txInfo} headCurrencySymbol parties =
   mustBurnAllHeadTokens
     && mustBeSignedByParticipant ctx headCurrencySymbol
-    && hasSTToken headCurrencySymbol outValue
  where
-  outValue =
-    maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
-
   mustBurnAllHeadTokens =
     burntTokens == length parties + 1
 

From 763c84a7fc056fe9ee0ad6c7308468db49ad1a39 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 29 Dec 2022 11:57:24 +0100
Subject: [PATCH 32/85] Add comments about ST token being present in output

---
 hydra-plutus/src/Hydra/Contract/Head.hs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index d09dfaa5e21..c421d63d34b 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -84,7 +84,7 @@ headValidator oldState input ctx =
 -- | On-Chain verification for 'Abort' transition. It verifies that:
 --
 --   * All PTs have been burnt: The right number of Head tokens, both PT for
---     parties and thread token, with the correct head id, are burnt,
+--     parties and thread token ST, with the correct head id, are burnt,
 --
 --   * All committed funds have been redistributed. This is done via v_commit
 --     and it only needs to ensure that we have spent all comitted outputs,
@@ -117,6 +117,8 @@ checkAbort ctx@ScriptContext{scriptContextTxInfo = txInfo} headCurrencySymbol pa
 --
 --   * The transaction is performed (i.e. signed) by one of the head participants
 --
+--   * ST token is present in the output
+--
 -- It must also initialize the on-chain state η* with a snapshot number and a
 -- hash of committed outputs.
 --
@@ -207,6 +209,8 @@ checkCollectCom _context _headContext _ = traceError "Expected Initial state in
 --     closing snapshot, depending on snapshot number
 --
 --   * The transaction is performed (i.e. signed) by one of the head participants
+--
+--   * ST token is present in the output
 checkClose ::
   ScriptContext ->
   [Party] ->
@@ -274,6 +278,7 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
 --   * The resulting closed state is consistent with the contested snapshot.
 --
 --   * The transaction is performed (i.e. signed) by one of the head participants
+--
 --   * ST token is present in the output
 checkContest ::
   ScriptContext ->

From 3244c979bd0464e8a0ed1029f8b2b449a13e6e01 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 29 Dec 2022 12:07:33 +0100
Subject: [PATCH 33/85] Small refactor

---
 hydra-node/src/Hydra/Chain/Direct/Tx.hs | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index 5586d333924..d1345ff6899 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -48,6 +48,7 @@ import Hydra.Ledger.Cardano.Builder (
 import Hydra.Party (Party, partyFromChain, partyToChain)
 import Hydra.Snapshot (Snapshot (..), SnapshotNumber, fromChainSnapshot)
 import Plutus.Orphans ()
+import Plutus.V1.Ledger.Api (CurrencySymbol)
 import Plutus.V2.Ledger.Api (CurrencySymbol (CurrencySymbol), fromBuiltin, fromData, toBuiltin)
 import qualified Plutus.V2.Ledger.Api as Plutus
 
@@ -178,7 +179,7 @@ commitTx ::
   -- locked by initial script
   (TxIn, TxOut CtxUTxO, Hash PaymentKey) ->
   Tx
-commitTx scriptRegistry networkId (HeadId headId) party utxo (initialInput, out, vkh) =
+commitTx scriptRegistry networkId headId party utxo (initialInput, out, vkh) =
   unsafeBuildTransaction $
     emptyTxBody
       & addInputs [(initialInput, initialWitness)]
@@ -196,7 +197,7 @@ commitTx scriptRegistry networkId (HeadId headId) party utxo (initialInput, out,
   initialScriptRef =
     fst (initialReference scriptRegistry)
   initialDatum =
-    mkScriptDatum $ Initial.InitialDatum (CurrencySymbol $ toBuiltin headId)
+    mkScriptDatum $ Initial.InitialDatum (headIdToCurrencySymbol headId)
   initialRedeemer =
     toScriptData . Initial.redeemer $
       Initial.ViaCommit (toPlutusTxOutRef <$> mCommittedInput)
@@ -237,7 +238,7 @@ collectComTx ::
   -- | Head id
   HeadId ->
   Tx
-collectComTx networkId vk initialThreadOutput commits (HeadId headId) =
+collectComTx networkId vk initialThreadOutput commits headId =
   unsafeBuildTransaction $
     emptyTxBody
       & addInputs ((headInput, headWitness) : (mkCommit <$> Map.toList commits))
@@ -269,7 +270,7 @@ collectComTx networkId vk initialThreadOutput commits (HeadId headId) =
         { Head.parties = initialParties
         , utxoHash
         , contestationPeriod = initialContestationPeriod
-        , openHeadId = CurrencySymbol $ toBuiltin headId
+        , openHeadId = headIdToCurrencySymbol headId
         }
 
   extractCommit d =
@@ -323,7 +324,7 @@ closeTx ::
   OpenThreadOutput ->
   HeadId ->
   Tx
-closeTx vk closing startSlotNo (endSlotNo, utcTime) openThreadOutput (HeadId headId) =
+closeTx vk closing startSlotNo (endSlotNo, utcTime) openThreadOutput headId =
   unsafeBuildTransaction $
     emptyTxBody
       & addInputs [(headInput, headWitness)]
@@ -362,7 +363,7 @@ closeTx vk closing startSlotNo (endSlotNo, utcTime) openThreadOutput (HeadId hea
         , utxoHash = toBuiltin utxoHashBytes
         , parties = openParties
         , contestationDeadline
-        , closedHeadId = CurrencySymbol $ toBuiltin headId
+        , closedHeadId = headIdToCurrencySymbol headId
         }
 
   snapshotNumber = toInteger $ case closing of
@@ -398,7 +399,7 @@ contestTx ::
   ClosedThreadOutput ->
   HeadId ->
   Tx
-contestTx vk Snapshot{number, utxo} sig (slotNo, _) ClosedThreadOutput{closedThreadUTxO = (headInput, headOutputBefore, ScriptDatumForTxIn -> headDatumBefore), closedParties, closedContestationDeadline} (HeadId headId) =
+contestTx vk Snapshot{number, utxo} sig (slotNo, _) ClosedThreadOutput{closedThreadUTxO = (headInput, headOutputBefore, ScriptDatumForTxIn -> headDatumBefore), closedParties, closedContestationDeadline} headId =
   unsafeBuildTransaction $
     emptyTxBody
       & addInputs [(headInput, headWitness)]
@@ -426,7 +427,7 @@ contestTx vk Snapshot{number, utxo} sig (slotNo, _) ClosedThreadOutput{closedThr
         , utxoHash
         , parties = closedParties
         , contestationDeadline = closedContestationDeadline
-        , closedHeadId = CurrencySymbol $ toBuiltin headId
+        , closedHeadId = headIdToCurrencySymbol headId
         }
   utxoHash = toBuiltin $ hashUTxO @Tx utxo
 
@@ -895,6 +896,9 @@ mkHeadId :: PolicyId -> HeadId
 mkHeadId =
   HeadId . serialiseToRawBytes
 
+headIdToCurrencySymbol :: HeadId -> CurrencySymbol
+headIdToCurrencySymbol (HeadId headId) = CurrencySymbol (toBuiltin headId)
+
 headTokensFromValue :: PlutusScript -> Value -> [(AssetName, Quantity)]
 headTokensFromValue headTokenScript v =
   [ (assetName, q)

From cd9a031e6515271f04f35be0a8c5f897378321be Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 29 Dec 2022 12:15:02 +0100
Subject: [PATCH 34/85] Revert some code in Close mutation tests

---
 .../test/Hydra/Chain/Direct/Contract/Close.hs | 22 ++++++-------------
 1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index 219778da5c5..292dcfd8fcd 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -203,24 +203,16 @@ genCloseMutation (tx, _utxo) =
         pure (TxValidityLowerBound (SlotNo lb), TxValidityUpperBound (SlotNo ub))
     , SomeMutation MutateHeadId <$> do
         otherHeadId <- headPolicyId <$> arbitrary `suchThat` (/= Fixture.testSeedInput)
-        let closeTxOuts = txOuts' tx
         pure $
-          Changes $
-            changeAllOutputs 0 closeTxOuts Fixture.testPolicyId otherHeadId
-              <> [ ChangeInput
-                    headInput
-                    (toUTxOContext $ replacePolicyIdWith Fixture.testPolicyId otherHeadId (toTxContext headResolvedInput))
-                    (Just $ toScriptData healthyCloseDatum)
-                 ]
+          Changes
+            [ ChangeOutput 0 (replacePolicyIdWith Fixture.testPolicyId otherHeadId headTxOut)
+            , ChangeInput
+                headInput
+                (toUTxOContext $ replacePolicyIdWith Fixture.testPolicyId otherHeadId (toTxContext headResolvedInput))
+                (Just $ toScriptData healthyCloseDatum)
+            ]
     ]
  where
-  changeAllOutputs :: Word -> [TxOut CtxTx] -> PolicyId -> PolicyId -> [Mutation]
-  changeAllOutputs i outputs originalHead otherHead = go i outputs []
-   where
-    go _ [] r = r
-    go n (output : outputs') r =
-      let result = r <> [ChangeOutput i (replacePolicyIdWith originalHead otherHead output)]
-       in go (n + 1) outputs' result
   headTxOut = fromJust $ txOuts' tx !!? 0
 
   closeRedeemer snapshotNumber sig =

From 169379cc94dd5a7e09a7517f14882d839060dbd1 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 29 Dec 2022 13:13:18 +0100
Subject: [PATCH 35/85] Increase the number of parties

---
 hydra-node/src/Hydra/Options.hs | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/hydra-node/src/Hydra/Options.hs b/hydra-node/src/Hydra/Options.hs
index 7e3af431b4e..2bfdcb44446 100644
--- a/hydra-node/src/Hydra/Options.hs
+++ b/hydra-node/src/Hydra/Options.hs
@@ -13,8 +13,8 @@ import qualified Data.ByteString.Char8 as BSC
 import Data.IP (IP (IPv4), toIPv4w)
 import Data.Text (unpack)
 import qualified Data.Text as T
-import Data.Version (showVersion)
 import Data.Time.Clock (nominalDiffTimeToSeconds)
+import Data.Version (showVersion)
 import Hydra.Cardano.Api (
   AsType (AsTxId),
   ChainPoint (..),
@@ -579,11 +579,12 @@ contestationPeriodParser =
  where
   parseNatural = UnsafeContestationPeriod <$> auto
 
-  parseNominalDiffTime = auto >>= \dt -> do
-    let s = nominalDiffTimeToSeconds dt
-    if s <= 0
-      then fail "negative contestation period"
-      else pure $ UnsafeContestationPeriod $ truncate s
+  parseNominalDiffTime =
+    auto >>= \dt -> do
+      let s = nominalDiffTimeToSeconds dt
+      if s <= 0
+        then fail "negative contestation period"
+        else pure $ UnsafeContestationPeriod $ truncate s
 
 data InvalidOptions
   = MaximumNumberOfPartiesExceeded
@@ -591,10 +592,10 @@ data InvalidOptions
   deriving (Eq, Show)
 
 -- | Hardcoded limit for maximum number of parties in a head protocol
--- The value 4 is obtained from calculating the costs of running the scripts
+-- The value 5 is obtained from calculating the costs of running the scripts
 -- and on-chan validators (see 'computeCollectComCost' 'computeAbortCost')
 maximumNumberOfParties :: Int
-maximumNumberOfParties = 4
+maximumNumberOfParties = 5
 
 explain :: InvalidOptions -> String
 explain = \case

From 550845eba159373deb96b611b39cebc4cd3b1e23 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 29 Dec 2022 13:49:53 +0100
Subject: [PATCH 36/85] Bump max parties to 8

---
 hydra-node/src/Hydra/Chain/Direct/State.hs                | 5 +++--
 hydra-node/src/Hydra/Options.hs                           | 4 ++--
 hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs | 5 ++++-
 hydra-node/test/Hydra/Chain/Direct/StateSpec.hs           | 5 +++--
 4 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/hydra-node/src/Hydra/Chain/Direct/State.hs b/hydra-node/src/Hydra/Chain/Direct/State.hs
index df4a775a27d..df8b76712a5 100644
--- a/hydra-node/src/Hydra/Chain/Direct/State.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/State.hs
@@ -93,6 +93,7 @@ import Hydra.Ledger (IsTx (hashUTxO))
 import Hydra.Ledger.Cardano (genOneUTxOFor, genTxIn, genUTxOAdaOnlyOfSize, genVerificationKey)
 import Hydra.Ledger.Cardano.Evaluate (genPointInTimeBefore, genValidityBoundsFromContestationPeriod, slotNoFromUTCTime)
 import Hydra.Ledger.Cardano.Json ()
+import Hydra.Options (maximumNumberOfParties)
 import Hydra.Party (Party, deriveParty)
 import Hydra.Snapshot (
   ConfirmedSnapshot (..),
@@ -842,7 +843,7 @@ genCommit =
 
 genCollectComTx :: Gen (ChainContext, [UTxO], InitialState, Tx)
 genCollectComTx = do
-  ctx <- genHydraContextFor 3
+  ctx <- genHydraContextFor maximumNumberOfParties
   txInit <- genInitTx ctx
   commits <- genCommits ctx txInit
   cctx <- pickChainContext ctx
@@ -861,7 +862,7 @@ genCloseTx numParties = do
 
 genContestTx :: Gen (HydraContext, PointInTime, ClosedState, Tx)
 genContestTx = do
-  ctx <- genHydraContextFor 3
+  ctx <- genHydraContextFor maximumNumberOfParties
   (u0, stOpen) <- genStOpen ctx
   confirmed <- genConfirmedSnapshot 0 u0 []
   cctx <- pickChainContext ctx
diff --git a/hydra-node/src/Hydra/Options.hs b/hydra-node/src/Hydra/Options.hs
index 2bfdcb44446..bb80a3f73b2 100644
--- a/hydra-node/src/Hydra/Options.hs
+++ b/hydra-node/src/Hydra/Options.hs
@@ -592,10 +592,10 @@ data InvalidOptions
   deriving (Eq, Show)
 
 -- | Hardcoded limit for maximum number of parties in a head protocol
--- The value 5 is obtained from calculating the costs of running the scripts
+-- The value is obtained from calculating the costs of running the scripts
 -- and on-chan validators (see 'computeCollectComCost' 'computeAbortCost')
 maximumNumberOfParties :: Int
-maximumNumberOfParties = 5
+maximumNumberOfParties = 8
 
 explain :: InvalidOptions -> String
 explain = \case
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
index e6f2e02c1cf..48cc102dc76 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
@@ -119,7 +119,10 @@ healthyParties = flip generateWith 42 $ do
   alice <- arbitrary
   bob <- arbitrary
   carol <- arbitrary
-  pure [alice, bob, carol]
+  peter <- arbitrary
+  judy <- arbitrary
+  john <- arbitrary
+  pure [alice, bob, carol, peter, judy, john]
 
 genCommittableTxOut :: Gen (TxIn, TxOut CtxUTxO)
 genCommittableTxOut =
diff --git a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
index 35f8a96c7c6..9b55c4ad830 100644
--- a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
@@ -74,6 +74,7 @@ import Hydra.Ledger.Cardano.Evaluate (
   maxTxSize,
   renderEvaluationReportFailures,
  )
+import Hydra.Options (maximumNumberOfParties)
 import Test.Aeson.GenericSpecs (roundtripAndGoldenSpecs)
 import Test.Consensus.Cardano.Generators ()
 import Test.Hydra.Prelude (
@@ -334,7 +335,7 @@ forAllClose ::
   Property
 forAllClose action = do
   -- FIXME: we should not hardcode number of parties but generate it within bounds
-  forAll (genCloseTx 3) $ \(ctx, st, tx, sn) ->
+  forAll (genCloseTx maximumNumberOfParties) $ \(ctx, st, tx, sn) ->
     let utxo = getKnownUTxO st <> getKnownUTxO ctx
      in action utxo tx
           & label (Prelude.head . Prelude.words . show $ sn)
@@ -382,7 +383,7 @@ forAllFanout ::
   Property
 forAllFanout action =
   -- TODO: The utxo to fanout should be more arbitrary to have better test coverage
-  forAll (sized $ \n -> genFanoutTx 3 (n `min` maxSupported)) $ \(hctx, stClosed, tx) ->
+  forAll (sized $ \n -> genFanoutTx maximumNumberOfParties (n `min` maxSupported)) $ \(hctx, stClosed, tx) ->
     forAllBlind (pickChainContext hctx) $ \ctx ->
       let utxo = getKnownUTxO stClosed <> getKnownUTxO ctx
        in action utxo tx

From c03b24e18eefb14c32792630461a6bda673145bc Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Fri, 30 Dec 2022 13:48:20 +0100
Subject: [PATCH 37/85] Include two more parties

---
 hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
index 48cc102dc76..7f4f0c05d93 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
@@ -122,7 +122,9 @@ healthyParties = flip generateWith 42 $ do
   peter <- arbitrary
   judy <- arbitrary
   john <- arbitrary
-  pure [alice, bob, carol, peter, judy, john]
+  mary <- arbitrary
+  tom <- arbitrary
+  pure [alice, bob, carol, peter, judy, john, mary, tom]
 
 genCommittableTxOut :: Gen (TxIn, TxOut CtxUTxO)
 genCommittableTxOut =

From 0ac031853d49d3eed4bf90a1b52d40104fb9fc7e Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Wed, 4 Jan 2023 14:14:30 +0100
Subject: [PATCH 38/85] Use maxNumberOfParties in more tests

---
 hydra-node/test/Hydra/Chain/Direct/HandlersSpec.hs |  3 ++-
 hydra-node/test/Hydra/Chain/Direct/StateSpec.hs    | 12 ++++++------
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/HandlersSpec.hs b/hydra-node/test/Hydra/Chain/Direct/HandlersSpec.hs
index 4456f76f5c4..fd03346a39e 100644
--- a/hydra-node/test/Hydra/Chain/Direct/HandlersSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/HandlersSpec.hs
@@ -49,6 +49,7 @@ import Hydra.Chain.Direct.State (
 import Hydra.Chain.Direct.TimeHandle (TimeHandle (slotToUTCTime), TimeHandleParams (..), genTimeParams, mkTimeHandle)
 import Hydra.Chain.Direct.Util (Block)
 import Hydra.Ledger.Cardano (genTxIn)
+import Hydra.Options (maximumNumberOfParties)
 import Ouroboros.Consensus.Block (Point (BlockPoint, GenesisPoint), blockPoint, pointSlot)
 import Ouroboros.Consensus.Cardano.Block (HardForkBlock (BlockBabbage))
 import qualified Ouroboros.Consensus.Protocol.Praos.Header as Praos
@@ -248,7 +249,7 @@ genRollbackPoint blocks = do
 -- to observe at least one state transition and different levels of rollback.
 genSequenceOfObservableBlocks :: Gen (ChainContext, ChainStateAt, [Block])
 genSequenceOfObservableBlocks = do
-  ctx <- genHydraContext 3
+  ctx <- genHydraContext maximumNumberOfParties
   -- NOTE: commits must be generated from each participant POV, and thus, we
   -- need all their respective ChainContext to move on.
   allContexts <- deriveChainContexts ctx
diff --git a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
index 9b55c4ad830..6cc6e40f5d4 100644
--- a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
@@ -125,7 +125,7 @@ spec = parallel $ do
     propIsValid forAllInit
 
     prop "is not observed if not invited" $
-      forAll2 (genHydraContext 3) (genHydraContext 3) $ \(ctxA, ctxB) ->
+      forAll2 (genHydraContext maximumNumberOfParties) (genHydraContext maximumNumberOfParties) $ \(ctxA, ctxB) ->
         null (ctxParties ctxA `intersect` ctxParties ctxB)
           ==> forAll2 (pickChainContext ctxA) (pickChainContext ctxB)
           $ \(cctxA, cctxB) ->
@@ -167,7 +167,7 @@ spec = parallel $ do
 
     prop "ignore aborts of other heads" $ do
       let twoDistinctHeads = do
-            ctx <- genHydraContext 3
+            ctx <- genHydraContext maximumNumberOfParties
             (ctx1, st1@InitialState{initialHeadId = h1}) <- genStInitial ctx
             (ctx2, st2@InitialState{initialHeadId = h2}) <- genStInitial ctx
             when (h1 == h2) discard
@@ -246,7 +246,7 @@ forAllInit ::
   (UTxO -> Tx -> property) ->
   Property
 forAllInit action =
-  forAllBlind (genHydraContext 3) $ \ctx ->
+  forAllBlind (genHydraContext maximumNumberOfParties) $ \ctx ->
     forAll (pickChainContext ctx) $ \cctx -> do
       forAll ((,) <$> genTxIn <*> genOutput (ownVerificationKey cctx)) $ \(seedIn, seedOut) -> do
         let tx = initialize cctx (ctxHeadParameters ctx) seedIn
@@ -273,7 +273,7 @@ forAllCommit' ::
   (ChainContext -> InitialState -> UTxO -> Tx -> property) ->
   Property
 forAllCommit' action = do
-  forAll (genHydraContext 3) $ \hctx ->
+  forAll (genHydraContext maximumNumberOfParties) $ \hctx ->
     forAll (genStInitial hctx) $ \(ctx, stInitial) ->
       forAllShow genCommit renderUTxO $ \toCommit ->
         let tx = unsafeCommit ctx stInitial toCommit
@@ -290,7 +290,7 @@ forAllNonEmptyByronCommit ::
   (PostTxError Tx -> Property) ->
   Property
 forAllNonEmptyByronCommit action = do
-  forAll (genHydraContext 3) $ \hctx ->
+  forAll (genHydraContext maximumNumberOfParties) $ \hctx ->
     forAll (genStInitial hctx) $ \(ctx, stInitial) ->
       forAllShow genByronCommit renderUTxO $ \utxo ->
         case commit ctx stInitial utxo of
@@ -302,7 +302,7 @@ forAllAbort ::
   (UTxO -> Tx -> property) ->
   Property
 forAllAbort action = do
-  forAll (genHydraContext 3) $ \ctx ->
+  forAll (genHydraContext maximumNumberOfParties) $ \ctx ->
     forAll (pickChainContext ctx) $ \cctx ->
       forAllBlind (genInitTx ctx) $ \initTx -> do
         forAllBlind (sublistOf =<< genCommits ctx initTx) $ \commits ->

From 4ee6ffcb6916de6bc926c1a1a8204037e58fd716 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Wed, 4 Jan 2023 14:19:34 +0100
Subject: [PATCH 39/85] Add haddock and rename toPlutusPolicyId to
 toPlutusCurrencySymbol

---
 hydra-cardano-api/src/Hydra/Cardano/Api/Value.hs          | 6 ++++--
 hydra-node/src/Hydra/Chain/Direct/Tx.hs                   | 4 ++--
 hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs      | 2 +-
 hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs      | 6 +++---
 hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs | 4 ++--
 hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs    | 6 +++---
 hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs     | 2 +-
 hydra-node/test/Hydra/Chain/Direct/TxSpec.hs              | 6 +++---
 8 files changed, 19 insertions(+), 17 deletions(-)

diff --git a/hydra-cardano-api/src/Hydra/Cardano/Api/Value.hs b/hydra-cardano-api/src/Hydra/Cardano/Api/Value.hs
index 56f5f278c06..d40d89973e7 100644
--- a/hydra-cardano-api/src/Hydra/Cardano/Api/Value.hs
+++ b/hydra-cardano-api/src/Hydra/Cardano/Api/Value.hs
@@ -97,8 +97,10 @@ toPlutusValue :: Value -> Plutus.Value
 toPlutusValue =
   Ledger.transValue . toLedgerValue
 
-toPlutusPolicyId :: PolicyId -> CurrencySymbol
-toPlutusPolicyId = Ledger.transPolicyID . toLedgerPolicyID
+-- | Convert Cardano api 'PolicyId' to Plutus `CurrencySymbol`
+toPlutusCurrencySymbol :: PolicyId -> CurrencySymbol
+toPlutusCurrencySymbol = Ledger.transPolicyID . toLedgerPolicyID
 
+-- | Convert Cardano api 'PolicyId' to Cardano ledger `PolicyID`
 toLedgerPolicyID :: PolicyId -> Ledger.PolicyID StandardCrypto
 toLedgerPolicyID (PolicyId sh) = Ledger.PolicyID (toShelleyScriptHash sh)
diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index d1345ff6899..f669e7438d8 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -150,7 +150,7 @@ mkHeadOutputInitial networkId tokenPolicyId HeadParameters{contestationPeriod, p
       Head.Initial
         (toChain contestationPeriod)
         (map partyToChain parties)
-        (toPlutusPolicyId tokenPolicyId)
+        (toPlutusCurrencySymbol tokenPolicyId)
 
 mkInitialOutput :: NetworkId -> PolicyId -> VerificationKey PaymentKey -> TxOut CtxTx
 mkInitialOutput networkId tokenPolicyId (verificationKeyHash -> pkh) =
@@ -163,7 +163,7 @@ mkInitialOutput networkId tokenPolicyId (verificationKeyHash -> pkh) =
   initialScript =
     fromPlutusScript Initial.validatorScript
   initialDatum =
-    mkTxOutDatum $ Initial.InitialDatum $ toPlutusPolicyId tokenPolicyId
+    mkTxOutDatum $ Initial.InitialDatum $ toPlutusCurrencySymbol tokenPolicyId
 
 -- | Craft a commit transaction which includes the "committed" utxo as a datum.
 commitTx ::
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
index 27c3ce5f911..c4651711b90 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
@@ -148,7 +148,7 @@ genAbortMutation (tx, utxo) =
     [ SomeMutation MutateParties . ChangeHeadDatum <$> do
         moreParties <- (: healthyParties) <$> arbitrary
         c <- arbitrary
-        pure $ Head.Initial c (partyToChain <$> moreParties) (toPlutusPolicyId $ headPolicyId testSeedInput)
+        pure $ Head.Initial c (partyToChain <$> moreParties) (toPlutusCurrencySymbol $ headPolicyId testSeedInput)
     , SomeMutation DropOneCommitOutput
         . RemoveOutput
         <$> choose (0, fromIntegral (length (txOuts' tx) - 1))
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index 292dcfd8fcd..bfa6d8aa94d 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -111,7 +111,7 @@ healthyCloseDatum =
     { parties = healthyOnChainParties
     , utxoHash = toBuiltin $ hashUTxO @Tx healthyUTxO
     , contestationPeriod = healthyContestationPeriod
-    , openHeadId = toPlutusPolicyId Fixture.testPolicyId
+    , openHeadId = toPlutusCurrencySymbol Fixture.testPolicyId
     }
 
 healthyContestationPeriod :: OnChain.ContestationPeriod
@@ -183,7 +183,7 @@ genCloseMutation (tx, _utxo) =
             { parties = mutatedParties
             , utxoHash = ""
             , contestationPeriod = healthyContestationPeriod
-            , openHeadId = toPlutusPolicyId Fixture.testPolicyId
+            , openHeadId = toPlutusCurrencySymbol Fixture.testPolicyId
             }
     , SomeMutation MutateRequiredSigner <$> do
         newSigner <- verificationKeyHash <$> genVerificationKey
@@ -253,6 +253,6 @@ genCloseMutation (tx, _utxo) =
         , contestationDeadline =
             let closingTime = slotNoToUTCTime healthySlotNo
              in posixFromUTCTime $ addUTCTime (fromInteger contestationPeriod) closingTime
-        , closedHeadId = toPlutusPolicyId Fixture.testPolicyId
+        , closedHeadId = toPlutusCurrencySymbol Fixture.testPolicyId
         }
     st -> error $ "unexpected state " <> show st
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
index 7f4f0c05d93..aa850322049 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
@@ -107,7 +107,7 @@ healthyCollectComInitialDatum =
   Head.Initial
     { contestationPeriod = healthyContestationPeriod
     , parties = healthyOnChainParties
-    , initialHeadId = toPlutusPolicyId testPolicyId
+    , initialHeadId = toPlutusCurrencySymbol testPolicyId
     }
 
 healthyOnChainParties :: [OnChain.Party]
@@ -188,7 +188,7 @@ genCollectComMutation (tx, utxo) =
         moreParties <- (: healthyOnChainParties) <$> arbitrary
         pure $
           Changes
-            [ ChangeHeadDatum $ Head.Initial c moreParties (toPlutusPolicyId testPolicyId)
+            [ ChangeHeadDatum $ Head.Initial c moreParties (toPlutusCurrencySymbol testPolicyId)
             , ChangeOutput 0 $ mutatedPartiesHeadTxOut moreParties headTxOut
             ]
     , SomeMutation MutateHeadId <$> do
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
index cebe33d607e..26c07df975e 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
@@ -100,7 +100,7 @@ healthyClosedState =
     , utxoHash = healthyClosedUTxOHash
     , parties = healthyOnChainParties
     , contestationDeadline = posixFromUTCTime healthyContestationDeadline
-    , closedHeadId = toPlutusPolicyId testPolicyId
+    , closedHeadId = toPlutusCurrencySymbol testPolicyId
     }
 
 healthySlotNo :: SlotNo
@@ -201,7 +201,7 @@ genContestMutation
               , utxoHash = healthyClosedUTxOHash
               , snapshotNumber = fromIntegral healthyClosedSnapshotNumber
               , contestationDeadline = arbitrary `generateWith` 42
-              , closedHeadId = toPlutusPolicyId testPolicyId
+              , closedHeadId = toPlutusCurrencySymbol testPolicyId
               }
       , SomeMutation MutateValidityPastDeadline . ChangeValidityInterval <$> do
           lb <- arbitrary
@@ -232,7 +232,7 @@ genContestMutation
                 , utxoHash = toBuiltin mutatedUTxOHash
                 , parties = healthyOnChainParties
                 , contestationDeadline = arbitrary `generateWith` 42
-                , closedHeadId = toPlutusPolicyId testPolicyId
+                , closedHeadId = toPlutusCurrencySymbol testPolicyId
                 }
           )
           headTxOut
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
index 0e9122b0c2d..907b8728067 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
@@ -80,7 +80,7 @@ healthyFanoutDatum =
     , utxoHash = toBuiltin $ hashUTxO @Tx healthyFanoutUTxO
     , parties = partyToChain <$> arbitrary `generateWith` 42
     , contestationDeadline = posixFromUTCTime healthyContestationDeadline
-    , closedHeadId = toPlutusPolicyId testPolicyId
+    , closedHeadId = toPlutusCurrencySymbol testPolicyId
     }
 
 data FanoutMutation
diff --git a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
index 749078218ac..360cb234d5d 100644
--- a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
@@ -78,7 +78,7 @@ spec =
                     consumedOutputs = fmap drop3rd commitsUTxO
                     headOutput = mkHeadOutput testNetworkId testPolicyId $ toUTxOContext $ mkTxOutDatum headDatum
                     onChainParties = partyToChain <$> parties
-                    headDatum = Head.Initial cperiod onChainParties (toPlutusPolicyId testPolicyId)
+                    headDatum = Head.Initial cperiod onChainParties (toPlutusCurrencySymbol testPolicyId)
                     initialThreadOutput =
                       InitialThreadOutput
                         { initialThreadUTxO =
@@ -120,7 +120,7 @@ spec =
                       Head.Initial
                         (contestationPeriodFromDiffTime contestationPeriod)
                         (map partyToChain parties)
-                        (toPlutusPolicyId testPolicyId)
+                        (toPlutusCurrencySymbol testPolicyId)
                     initials = Map.fromList (drop2nd <$> resolvedInitials)
                     initialsUTxO = drop3rd <$> resolvedInitials
                     commits = Map.fromList (drop2nd <$> resolvedCommits)
@@ -333,7 +333,7 @@ genAbortableOutputs parties =
 
   initialScript = fromPlutusScript Initial.validatorScript
 
-  initialDatum = Initial.InitialDatum $ toPlutusPolicyId testPolicyId
+  initialDatum = Initial.InitialDatum $ toPlutusCurrencySymbol testPolicyId
 
 fst3 :: (a, b, c) -> a
 fst3 (a, _, _) = a

From 89cd1ee877053f6bb0687c1c105ecbd6318d3d4d Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Wed, 4 Jan 2023 14:23:51 +0100
Subject: [PATCH 40/85] Add back the trace in the v_commit

---
 hydra-plutus/src/Hydra/Contract/Commit.hs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Commit.hs b/hydra-plutus/src/Hydra/Contract/Commit.hs
index 101218d2fd4..bd289f14f77 100644
--- a/hydra-plutus/src/Hydra/Contract/Commit.hs
+++ b/hydra-plutus/src/Hydra/Contract/Commit.hs
@@ -120,8 +120,9 @@ validator (_party, headScriptHash, commit) consumer ScriptContext{scriptContextT
                       case commit of
                         Nothing -> True
                         Just Commit{preSerializedOutput} ->
-                          -- There should be an output in the transaction corresponding to this preSerializedOutput
-                          preSerializedOutput `elem` (Builtins.serialiseData . toBuiltinData <$> txInfoOutputs txInfo)
+                          traceIfFalse "cannot find committed output" $
+                            -- There should be an output in the transaction corresponding to this preSerializedOutput
+                            preSerializedOutput `elem` (Builtins.serialiseData . toBuiltinData <$> txInfoOutputs txInfo)
                     -- NOTE: In the Collectcom case the inclusion of the committed output 'commit' is
                     -- delegated to the 'CollectCom' script who has more information to do it.
                     ViaCollectCom -> True

From 1c338ee157a28f8c708080be1ec937f03cb9116e Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Wed, 4 Jan 2023 14:29:53 +0100
Subject: [PATCH 41/85] Rename headPolicyId to headId in v_initial

---
 hydra-plutus/exe/inspect-script/Main.hs    |  4 ++--
 hydra-plutus/src/Hydra/Contract/Initial.hs | 10 +++++-----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/hydra-plutus/exe/inspect-script/Main.hs b/hydra-plutus/exe/inspect-script/Main.hs
index 842eb37bbdf..1a1565f4b63 100644
--- a/hydra-plutus/exe/inspect-script/Main.hs
+++ b/hydra-plutus/exe/inspect-script/Main.hs
@@ -17,7 +17,7 @@ import qualified Hydra.Contract.Hash as Hash
 import Hydra.Contract.Head as Head
 import Hydra.Contract.HeadState as Head
 import Hydra.Contract.Initial as Initial
-import Plutus.V2.Ledger.Api (Data, Script, toData)
+import Plutus.V2.Ledger.Api (CurrencySymbol (CurrencySymbol), Data, Script, toData)
 import PlutusTx (getPlc)
 import PlutusTx.Code (CompiledCode)
 import Prettyprinter (defaultLayoutOptions, layoutPretty, pretty)
@@ -102,7 +102,7 @@ main = do
     , (abortDatum, "abortDatum")
     ]
 
-  headDatum = toData $ Head.Initial 1_000_000_000_000 []
+  headDatum = toData $ Head.Initial 1_000_000_000_000 [] (CurrencySymbol hydraHeadV1)
 
   abortDatum = toData Head.Final
 
diff --git a/hydra-plutus/src/Hydra/Contract/Initial.hs b/hydra-plutus/src/Hydra/Contract/Initial.hs
index 2e708480a68..ab6e4c046b7 100644
--- a/hydra-plutus/src/Hydra/Contract/Initial.hs
+++ b/hydra-plutus/src/Hydra/Contract/Initial.hs
@@ -37,7 +37,7 @@ import qualified PlutusTx.AssocMap as AssocMap
 import qualified PlutusTx.Builtins as Builtins
 
 newtype InitialDatum = InitialDatum
-  { headPolicyId :: CurrencySymbol
+  { headId :: CurrencySymbol
   }
 
 PlutusTx.unstableMakeIsData ''InitialDatum
@@ -72,21 +72,21 @@ validator ::
   InitialRedeemer ->
   ScriptContext ->
   Bool
-validator commitValidator InitialDatum{headPolicyId} red context =
+validator commitValidator InitialDatum{headId} red context =
   case red of
     ViaAbort -> True
     ViaCommit{committedRef} ->
       checkCommit commitValidator committedRef context
-        && checkAuthorAndHeadPolicy context headPolicyId
+        && checkAuthorAndHeadPolicy context headId
 
 -- | Verifies that the commit is only done by the author
 checkAuthorAndHeadPolicy ::
   ScriptContext ->
   CurrencySymbol ->
   Bool
-checkAuthorAndHeadPolicy context@ScriptContext{scriptContextTxInfo = txInfo} headPolicyId =
+checkAuthorAndHeadPolicy context@ScriptContext{scriptContextTxInfo = txInfo} headId =
   unTokenName ourParticipationTokenName `elem` (getPubKeyHash <$> txInfoSignatories txInfo)
-    && policyId == headPolicyId
+    && policyId == headId
  where
   (policyId, ourParticipationTokenName) =
     case AssocMap.toList (getValue initialValue) of

From 64d05fb407154ffc326d6cd49f5821e8ac995f2f Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Wed, 4 Jan 2023 14:44:02 +0100
Subject: [PATCH 42/85] Add missing trace

---
 hydra-plutus/src/Hydra/Contract/Initial.hs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Initial.hs b/hydra-plutus/src/Hydra/Contract/Initial.hs
index ab6e4c046b7..3a6a57b90e5 100644
--- a/hydra-plutus/src/Hydra/Contract/Initial.hs
+++ b/hydra-plutus/src/Hydra/Contract/Initial.hs
@@ -110,7 +110,8 @@ checkCommit commitValidator committedRef context@ScriptContext{scriptContextTxIn
   checkCommittedValue && checkLockedCommit
  where
   checkCommittedValue =
-    lockedValue == initialValue + committedValue
+    traceIfFalse "lockedValue does not match" $
+      lockedValue == initialValue + committedValue
 
   checkLockedCommit =
     case (committedTxOut, lockedCommit) of

From b99c5741f29ec9e4667b1ecfb352308a7c4155be Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Wed, 4 Jan 2023 14:48:40 +0100
Subject: [PATCH 43/85] Refactor v_initial token discovery

---
 hydra-plutus/src/Hydra/Contract/Initial.hs | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Initial.hs b/hydra-plutus/src/Hydra/Contract/Initial.hs
index 3a6a57b90e5..5a0d796305d 100644
--- a/hydra-plutus/src/Hydra/Contract/Initial.hs
+++ b/hydra-plutus/src/Hydra/Contract/Initial.hs
@@ -86,15 +86,14 @@ checkAuthorAndHeadPolicy ::
   Bool
 checkAuthorAndHeadPolicy context@ScriptContext{scriptContextTxInfo = txInfo} headId =
   unTokenName ourParticipationTokenName `elem` (getPubKeyHash <$> txInfoSignatories txInfo)
-    && policyId == headId
  where
-  (policyId, ourParticipationTokenName) =
-    case AssocMap.toList (getValue initialValue) of
-      [_someAdas, (headCurrencyHopefully, tokenMap)] ->
+  ourParticipationTokenName =
+    case AssocMap.lookup headId (getValue initialValue) of
+      Nothing -> traceError "Could not find the correct CurrencySymbol in tokens"
+      Just tokenMap ->
         case AssocMap.toList tokenMap of
-          [(tk, q)] | q == 1 -> (headCurrencyHopefully, tk)
-          _ -> traceError "multiple head tokens or more than 1 PTs found"
-      _ -> traceError "missing head tokens"
+          [(tk, q)] | q == 1 -> tk
+          _moreThanOneToken -> traceError "multiple head tokens or more than 1 PTs found"
 
   -- TODO: DRY
   initialValue =

From ccb8c7d4ed13ec0a818f5854678a72d4e8325019 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Wed, 4 Jan 2023 14:51:55 +0100
Subject: [PATCH 44/85] Rename hasSTToken to hasST

---
 hydra-plutus/src/Hydra/Contract/Head.hs | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index c421d63d34b..bbcf7fe1bac 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -139,7 +139,7 @@ checkCollectCom ctx@ScriptContext{scriptContextTxInfo = txInfo} headAddress Init
   mustContinueHeadWith ctx headAddress expectedChangeValue expectedOutputDatum
     && everyoneHasCommitted
     && mustBeSignedByParticipant ctx initialHeadId
-    && hasSTToken initialHeadId outValue
+    && hasST initialHeadId outValue
  where
   outValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
@@ -225,7 +225,7 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
   hasBoundedValidity
     && checkSnapshot
     && mustBeSignedByParticipant ctx headPolicyId
-    && hasSTToken headPolicyId outValue
+    && hasST headPolicyId outValue
  where
   hasBoundedValidity = tMax - tMin <= cp
 
@@ -302,7 +302,7 @@ checkContest ctx@ScriptContext{scriptContextTxInfo} contestationDeadline parties
       (Closed{parties, snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, contestationDeadline, closedHeadId = headPolicyId})
     && mustBeSignedByParticipant ctx headPolicyId
     && mustBeWithinContestationPeriod
-    && hasSTToken headPolicyId outValue
+    && hasST headPolicyId outValue
  where
   outValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
@@ -386,8 +386,8 @@ makeContestationDeadline cperiod ScriptContext{scriptContextTxInfo} =
 
 -- | Checks that the output contains the ST token with the head 'CurrencySymbol'
 -- and 'TokenName' of 'hydraHeadV1'
-hasSTToken :: CurrencySymbol -> Value -> Bool
-hasSTToken headPolicyId v =
+hasST :: CurrencySymbol -> Value -> Bool
+hasST headPolicyId v =
   isJust $
     find
       (\(cs, tokenMap) -> cs == headPolicyId && hasHydraToken tokenMap)
@@ -395,7 +395,7 @@ hasSTToken headPolicyId v =
  where
   hasHydraToken tm =
     isJust $ find (\(tn, q) -> q == 1 && TokenName hydraHeadV1 == tn) (Map.toList tm)
-{-# INLINEABLE hasSTToken #-}
+{-# INLINEABLE hasST #-}
 
 mkHeadAddress :: ScriptContext -> Address
 mkHeadAddress ctx =

From d36715060325c06492231deadb4a3bba4fdb3ea9 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Wed, 4 Jan 2023 15:11:09 +0100
Subject: [PATCH 45/85] CollectCom refactor arguments

---
 hydra-plutus/src/Hydra/Contract/Head.hs | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index bbcf7fe1bac..b45fe88bbac 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -69,7 +69,7 @@ headValidator ::
 headValidator oldState input ctx =
   case (oldState, input) of
     (initialState@Initial{}, CollectCom) ->
-      checkCollectCom ctx (mkHeadAddress ctx) initialState
+      checkCollectCom ctx initialState
     (Initial{parties, initialHeadId}, Abort) ->
       checkAbort ctx initialHeadId parties
     (Open{parties, utxoHash = initialUtxoHash, contestationPeriod, openHeadId}, Close{snapshotNumber, utxoHash = closedUtxoHash, signature}) ->
@@ -130,17 +130,16 @@ checkAbort ctx@ScriptContext{scriptContextTxInfo = txInfo} headCurrencySymbol pa
 checkCollectCom ::
   -- | Script execution context
   ScriptContext ->
-  -- | Head address
-  Address ->
   -- | Initial state
   State ->
   Bool
-checkCollectCom ctx@ScriptContext{scriptContextTxInfo = txInfo} headAddress Initial{contestationPeriod, parties, initialHeadId} =
+checkCollectCom ctx@ScriptContext{scriptContextTxInfo = txInfo} Initial{contestationPeriod, parties, initialHeadId} =
   mustContinueHeadWith ctx headAddress expectedChangeValue expectedOutputDatum
     && everyoneHasCommitted
     && mustBeSignedByParticipant ctx initialHeadId
     && hasST initialHeadId outValue
  where
+  headAddress = mkHeadAddress ctx
   outValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
   everyoneHasCommitted =
@@ -196,7 +195,7 @@ checkCollectCom ctx@ScriptContext{scriptContextTxInfo = txInfo} headAddress Init
         mCommit
       Nothing ->
         traceError "commitDatum failed fromBuiltinData"
-checkCollectCom _context _headContext _ = traceError "Expected Initial state in checkCollectCom"
+checkCollectCom _context _ = traceError "Expected Initial state in checkCollectCom"
 {-# INLINEABLE checkCollectCom #-}
 
 -- | The close validator must verify that:
@@ -437,17 +436,17 @@ findParticipationTokens headCurrency (Value val) =
 
 mustContinueHeadWith :: ScriptContext -> Address -> Integer -> Datum -> Bool
 mustContinueHeadWith ScriptContext{scriptContextTxInfo = txInfo} headAddress changeValue datum =
-  checkOutputDatum [] (txInfoOutputs txInfo)
+  checkOutputDatumAndValue [] (txInfoOutputs txInfo)
  where
-  checkOutputDatum xs = \case
+  checkOutputDatumAndValue xs = \case
     [] ->
       traceError "no continuing head output"
     (o : rest)
       | txOutAddress o == headAddress ->
-        findTxOutDatum txInfo o == datum
+        traceIfFalse "wrong output head datum" (findTxOutDatum txInfo o == datum)
           && checkOutputValue (xs <> rest)
     (o : rest) ->
-      checkOutputDatum (o : xs) rest
+      checkOutputDatumAndValue (o : xs) rest
 
   checkOutputValue = \case
     [] ->

From ed5f7ee6c7582f0b980d1346b6e614f5f4afdca0 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 5 Jan 2023 09:51:12 +0100
Subject: [PATCH 46/85] Rename state headId fields to be the same

---
 hydra-node/golden/ChainState.json             |  2 +-
 ...d (TimedServerOutput (Tx BabbageEra)).json |  2 +-
 hydra-node/src/Hydra/Chain/Direct/State.hs    | 48 +++++++++----------
 hydra-node/src/Hydra/Chain/Direct/Tx.hs       |  4 +-
 .../test/Hydra/Chain/Direct/Contract/Close.hs |  4 +-
 .../Hydra/Chain/Direct/Contract/CollectCom.hs |  8 ++--
 .../test/Hydra/Chain/Direct/StateSpec.hs      |  4 +-
 hydra-plutus/src/Hydra/Contract/Head.hs       |  6 +--
 hydra-plutus/src/Hydra/Contract/HeadState.hs  |  2 +-
 9 files changed, 40 insertions(+), 40 deletions(-)

diff --git a/hydra-node/golden/ChainState.json b/hydra-node/golden/ChainState.json
index f3face84a2e..c85c14215f5 100644
--- a/hydra-node/golden/ChainState.json
+++ b/hydra-node/golden/ChainState.json
@@ -115,7 +115,7 @@
         },
         {
             "contents": {
-                "openHeadId": "10167e37be3ed75e835f7f85be3dfd7b64e78a7cec4d4b1c8066697a",
+                "headId": "10167e37be3ed75e835f7f85be3dfd7b64e78a7cec4d4b1c8066697a",
                 "openHeadTokenScript": {
                     "cborHex": "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                     "description": "",
diff --git a/hydra-node/golden/ReasonablySized (TimedServerOutput (Tx BabbageEra)).json b/hydra-node/golden/ReasonablySized (TimedServerOutput (Tx BabbageEra)).json
index efaaaf6ef49..367a87524a9 100644
--- a/hydra-node/golden/ReasonablySized (TimedServerOutput (Tx BabbageEra)).json	
+++ b/hydra-node/golden/ReasonablySized (TimedServerOutput (Tx BabbageEra)).json	
@@ -21991,7 +21991,7 @@
                 "chainState": {
                     "chainState": {
                         "contents": {
-                            "openHeadId": "ca007409d49dd87ff1821b56468c83faa7507134117045306aac4551",
+                            "headId": "ca007409d49dd87ff1821b56468c83faa7507134117045306aac4551",
                             "openHeadTokenScript": {
                                 "cborHex": "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                                 "description": "",
diff --git a/hydra-node/src/Hydra/Chain/Direct/State.hs b/hydra-node/src/Hydra/Chain/Direct/State.hs
index df8b76712a5..17b7d8613d0 100644
--- a/hydra-node/src/Hydra/Chain/Direct/State.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/State.hs
@@ -215,7 +215,7 @@ data InitialState = InitialState
   { initialThreadOutput :: InitialThreadOutput
   , initialInitials :: [UTxOWithScript]
   , initialCommits :: [UTxOWithScript]
-  , initialHeadId :: HeadId
+  , headId :: HeadId
   , initialHeadTokenScript :: PlutusScript
   }
   deriving (Eq, Show, Generic, ToJSON, FromJSON)
@@ -236,7 +236,7 @@ instance HasKnownUTxO InitialState where
 
 data OpenState = OpenState
   { openThreadOutput :: OpenThreadOutput
-  , openHeadId :: HeadId
+  , headId :: HeadId
   , openHeadTokenScript :: PlutusScript
   , openUtxoHash :: UTxOHash
   }
@@ -252,7 +252,7 @@ instance HasKnownUTxO OpenState where
 
 data ClosedState = ClosedState
   { closedThreadOutput :: ClosedThreadOutput
-  , closedHeadId :: HeadId
+  , headId :: HeadId
   , closedHeadTokenScript :: PlutusScript
   }
   deriving (Eq, Show, Generic, ToJSON, FromJSON)
@@ -296,9 +296,9 @@ commit ctx st utxo = do
       case UTxO.pairs utxo of
         [aUTxO] -> do
           rejectByronAddress aUTxO
-          Right $ commitTx scriptRegistry networkId initialHeadId ownParty (Just aUTxO) initial
+          Right $ commitTx scriptRegistry networkId headId ownParty (Just aUTxO) initial
         [] -> do
-          Right $ commitTx scriptRegistry networkId initialHeadId ownParty Nothing initial
+          Right $ commitTx scriptRegistry networkId headId ownParty Nothing initial
         _ ->
           Left (MoreThanOneUTxOCommitted @Tx)
  where
@@ -307,7 +307,7 @@ commit ctx st utxo = do
   InitialState
     { initialInitials
     , initialHeadTokenScript
-    , initialHeadId
+    , headId
     } = st
 
   ownInitial :: Maybe (TxIn, TxOut CtxUTxO, Hash PaymentKey)
@@ -372,14 +372,14 @@ collect ::
   Tx
 collect ctx st = do
   let commits = Map.fromList $ fmap tripleToPair initialCommits
-   in collectComTx networkId ownVerificationKey initialThreadOutput commits initialHeadId
+   in collectComTx networkId ownVerificationKey initialThreadOutput commits headId
  where
   ChainContext{networkId, ownVerificationKey} = ctx
 
   InitialState
     { initialThreadOutput
     , initialCommits
-    , initialHeadId
+    , headId
     } = st
 
   tripleToPair (a, b, c) = (a, (b, c))
@@ -400,7 +400,7 @@ close ::
   PointInTime ->
   Tx
 close ctx st confirmedSnapshot startSlotNo pointInTime =
-  closeTx ownVerificationKey closingSnapshot startSlotNo pointInTime openThreadOutput openHeadId
+  closeTx ownVerificationKey closingSnapshot startSlotNo pointInTime openThreadOutput headId
  where
   closingSnapshot = case confirmedSnapshot of
     -- XXX: Not needing anything of the 'InitialSnapshot' is another hint that
@@ -418,7 +418,7 @@ close ctx st confirmedSnapshot startSlotNo pointInTime =
   OpenState
     { openThreadOutput
     , openUtxoHash
-    , openHeadId
+    , headId
     } = st
 
 -- | Construct a contest transaction based on the 'ClosedState' and a confirmed
@@ -431,7 +431,7 @@ contest ::
   PointInTime ->
   Tx
 contest ctx st confirmedSnapshot pointInTime = do
-  contestTx ownVerificationKey sn sigs pointInTime closedThreadOutput closedHeadId
+  contestTx ownVerificationKey sn sigs pointInTime closedThreadOutput headId
  where
   (sn, sigs) =
     case confirmedSnapshot of
@@ -442,7 +442,7 @@ contest ctx st confirmedSnapshot pointInTime = do
 
   ClosedState
     { closedThreadOutput
-    , closedHeadId
+    , headId
     } = st
 
 -- | Construct a fanout transaction based on the 'ClosedState' and off-chain
@@ -503,7 +503,7 @@ observeInit ctx tx = do
       { initialThreadOutput = threadOutput
       , initialInitials = initials
       , initialCommits = commits
-      , initialHeadId = headId
+      , headId = headId
       , initialHeadTokenScript = headTokenScript
       }
 
@@ -551,20 +551,20 @@ observeCollect ::
 observeCollect st tx = do
   let utxo = getKnownUTxO st
   observation <- observeCollectComTx utxo tx
-  let CollectComObservation{threadOutput, headId, utxoHash} = observation
-  guard (headId == initialHeadId)
+  let CollectComObservation{threadOutput, headId = collectComHeadId, utxoHash} = observation
+  guard (initialHeadId == collectComHeadId)
   let event = OnCollectComTx
   let st' =
         OpenState
           { openThreadOutput = threadOutput
-          , openHeadId = initialHeadId
+          , headId = initialHeadId
           , openHeadTokenScript = initialHeadTokenScript
           , openUtxoHash = utxoHash
           }
   pure (event, st')
  where
   InitialState
-    { initialHeadId
+    { headId = initialHeadId
     , initialHeadTokenScript
     } = st
 
@@ -589,8 +589,8 @@ observeClose ::
 observeClose st tx = do
   let utxo = getKnownUTxO st
   observation <- observeCloseTx utxo tx
-  let CloseObservation{threadOutput, headId, snapshotNumber} = observation
-  guard (headId == openHeadId)
+  let CloseObservation{threadOutput, headId = closeObservationHeadId, snapshotNumber} = observation
+  guard (openHeadId == closeObservationHeadId)
   let ClosedThreadOutput{closedContestationDeadline} = threadOutput
   let event =
         OnCloseTx
@@ -600,13 +600,13 @@ observeClose st tx = do
   let st' =
         ClosedState
           { closedThreadOutput = threadOutput
-          , closedHeadId = headId
+          , headId = openHeadId
           , closedHeadTokenScript = openHeadTokenScript
           }
   pure (event, st')
  where
   OpenState
-    { openHeadId
+    { headId = openHeadId
     , openHeadTokenScript
     } = st
 
@@ -621,14 +621,14 @@ observeContest ::
 observeContest st tx = do
   let utxo = getKnownUTxO st
   observation <- observeContestTx utxo tx
-  let ContestObservation{contestedThreadOutput, headId, snapshotNumber} = observation
-  guard (headId == closedHeadId)
+  let ContestObservation{contestedThreadOutput, headId = contestObservationHeadId, snapshotNumber} = observation
+  guard (closedStateHeadId == contestObservationHeadId)
   let event = OnContestTx{snapshotNumber}
   let st' = st{closedThreadOutput = closedThreadOutput{closedThreadUTxO = contestedThreadOutput}}
   pure (event, st')
  where
   ClosedState
-    { closedHeadId
+    { headId = closedStateHeadId
     , closedThreadOutput
     } = st
 
diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index f669e7438d8..cf4b30a56e1 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -197,7 +197,7 @@ commitTx scriptRegistry networkId headId party utxo (initialInput, out, vkh) =
   initialScriptRef =
     fst (initialReference scriptRegistry)
   initialDatum =
-    mkScriptDatum $ Initial.InitialDatum (headIdToCurrencySymbol headId)
+    mkScriptDatum $ Initial.InitialDatum{headId = headIdToCurrencySymbol headId}
   initialRedeemer =
     toScriptData . Initial.redeemer $
       Initial.ViaCommit (toPlutusTxOutRef <$> mCommittedInput)
@@ -270,7 +270,7 @@ collectComTx networkId vk initialThreadOutput commits headId =
         { Head.parties = initialParties
         , utxoHash
         , contestationPeriod = initialContestationPeriod
-        , openHeadId = headIdToCurrencySymbol headId
+        , headId = headIdToCurrencySymbol headId
         }
 
   extractCommit d =
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index bfa6d8aa94d..f5e5e35f833 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -111,7 +111,7 @@ healthyCloseDatum =
     { parties = healthyOnChainParties
     , utxoHash = toBuiltin $ hashUTxO @Tx healthyUTxO
     , contestationPeriod = healthyContestationPeriod
-    , openHeadId = toPlutusCurrencySymbol Fixture.testPolicyId
+    , headId = toPlutusCurrencySymbol Fixture.testPolicyId
     }
 
 healthyContestationPeriod :: OnChain.ContestationPeriod
@@ -183,7 +183,7 @@ genCloseMutation (tx, _utxo) =
             { parties = mutatedParties
             , utxoHash = ""
             , contestationPeriod = healthyContestationPeriod
-            , openHeadId = toPlutusCurrencySymbol Fixture.testPolicyId
+            , headId = toPlutusCurrencySymbol Fixture.testPolicyId
             }
     , SomeMutation MutateRequiredSigner <$> do
         newSigner <- verificationKeyHash <$> genVerificationKey
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
index aa850322049..6b62e28be85 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
@@ -207,8 +207,8 @@ genCollectComMutation (tx, utxo) =
 
   mutatedPartiesHeadTxOut parties =
     changeHeadOutputDatum $ \case
-      Head.Open{utxoHash, contestationPeriod, openHeadId} ->
-        Head.Open{Head.parties = parties, contestationPeriod, utxoHash, openHeadId}
+      Head.Open{utxoHash, contestationPeriod, headId} ->
+        Head.Open{Head.parties = parties, contestationPeriod, utxoHash, headId}
       st -> error $ "Unexpected state " <> show st
 
   mutateUTxOHash = do
@@ -216,6 +216,6 @@ genCollectComMutation (tx, utxo) =
     pure $ changeHeadOutputDatum (mutateState mutatedUTxOHash) headTxOut
 
   mutateState mutatedUTxOHash = \case
-    Head.Open{parties, contestationPeriod, openHeadId} ->
-      Head.Open{parties, contestationPeriod, Head.utxoHash = toBuiltin mutatedUTxOHash, openHeadId}
+    Head.Open{parties, contestationPeriod, headId} ->
+      Head.Open{parties, contestationPeriod, Head.utxoHash = toBuiltin mutatedUTxOHash, headId}
     st -> st
diff --git a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
index 6cc6e40f5d4..c091c6c80fd 100644
--- a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
@@ -168,8 +168,8 @@ spec = parallel $ do
     prop "ignore aborts of other heads" $ do
       let twoDistinctHeads = do
             ctx <- genHydraContext maximumNumberOfParties
-            (ctx1, st1@InitialState{initialHeadId = h1}) <- genStInitial ctx
-            (ctx2, st2@InitialState{initialHeadId = h2}) <- genStInitial ctx
+            (ctx1, st1@InitialState{headId = h1}) <- genStInitial ctx
+            (ctx2, st2@InitialState{headId = h2}) <- genStInitial ctx
             when (h1 == h2) discard
             pure ((ctx1, st1), (ctx2, st2))
       forAll twoDistinctHeads $ \((ctx1, stHead1), (ctx2, stHead2)) ->
diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index b45fe88bbac..785aa047513 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -72,8 +72,8 @@ headValidator oldState input ctx =
       checkCollectCom ctx initialState
     (Initial{parties, initialHeadId}, Abort) ->
       checkAbort ctx initialHeadId parties
-    (Open{parties, utxoHash = initialUtxoHash, contestationPeriod, openHeadId}, Close{snapshotNumber, utxoHash = closedUtxoHash, signature}) ->
-      checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash signature contestationPeriod openHeadId
+    (Open{parties, utxoHash = initialUtxoHash, contestationPeriod, headId}, Close{snapshotNumber, utxoHash = closedUtxoHash, signature}) ->
+      checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash signature contestationPeriod headId
     (Closed{parties, snapshotNumber = closedSnapshotNumber, contestationDeadline, closedHeadId}, Contest{snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, signature}) ->
       checkContest ctx contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash signature closedHeadId
     (Closed{utxoHash, contestationDeadline}, Fanout{numberOfFanoutOutputs}) ->
@@ -153,7 +153,7 @@ checkCollectCom ctx@ScriptContext{scriptContextTxInfo = txInfo} Initial{contesta
   expectedOutputDatum :: Datum
   expectedOutputDatum =
     let utxoHash = hashPreSerializedCommits collectedCommits
-     in Datum $ toBuiltinData Open{parties, utxoHash, contestationPeriod, openHeadId = initialHeadId}
+     in Datum $ toBuiltinData Open{parties, utxoHash, contestationPeriod, headId = initialHeadId}
 
   -- Collect fuel and commits from resolved inputs. Any output containing a PT
   -- is treated as a commit, "our" output is the head output and all remaining
diff --git a/hydra-plutus/src/Hydra/Contract/HeadState.hs b/hydra-plutus/src/Hydra/Contract/HeadState.hs
index 906d6d9ccdb..bb435e686ff 100644
--- a/hydra-plutus/src/Hydra/Contract/HeadState.hs
+++ b/hydra-plutus/src/Hydra/Contract/HeadState.hs
@@ -30,7 +30,7 @@ data State
       { contestationPeriod :: ContestationPeriod
       , parties :: [Party]
       , utxoHash :: Hash
-      , openHeadId :: CurrencySymbol
+      , headId :: CurrencySymbol
       }
   | Closed
       { parties :: [Party]

From a7617208a14c75b9d1b87906384dccc8282a4cea Mon Sep 17 00:00:00 2001
From: Pascal Grange <pascal@grange.nom.fr>
Date: Thu, 5 Jan 2023 09:14:33 +0000
Subject: [PATCH 47/85] Restore traces

---
 hydra-plutus/src/Hydra/Contract/Initial.hs | 37 +++++++++++++++++++---
 1 file changed, 33 insertions(+), 4 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Initial.hs b/hydra-plutus/src/Hydra/Contract/Initial.hs
index 5a0d796305d..d6426c244fe 100644
--- a/hydra-plutus/src/Hydra/Contract/Initial.hs
+++ b/hydra-plutus/src/Hydra/Contract/Initial.hs
@@ -10,6 +10,7 @@ import PlutusTx.Prelude
 import Hydra.Contract.Commit (Commit (..))
 import qualified Hydra.Contract.Commit as Commit
 import Plutus.Extras (ValidatorType, scriptValidatorHash, wrapValidator)
+import Plutus.V1.Ledger.Value (assetClass, assetClassValueOf)
 import Plutus.V2.Ledger.Api (
   CurrencySymbol,
   Datum (..),
@@ -28,6 +29,8 @@ import Plutus.V2.Ledger.Api (
   Validator (getValidator),
   ValidatorHash,
   Value (getValue),
+  adaSymbol,
+  adaToken,
   mkValidatorScript,
  )
 import Plutus.V2.Ledger.Contexts (findDatum, findOwnInput, findTxInByTxOutRef, scriptOutputsAt, valueLockedBy)
@@ -85,7 +88,8 @@ checkAuthorAndHeadPolicy ::
   CurrencySymbol ->
   Bool
 checkAuthorAndHeadPolicy context@ScriptContext{scriptContextTxInfo = txInfo} headId =
-  unTokenName ourParticipationTokenName `elem` (getPubKeyHash <$> txInfoSignatories txInfo)
+  traceIfFalse "Missing or invalid commit author" $
+    unTokenName ourParticipationTokenName `elem` (getPubKeyHash <$> txInfoSignatories txInfo)
  where
   ourParticipationTokenName =
     case AssocMap.lookup headId (getValue initialValue) of
@@ -110,7 +114,10 @@ checkCommit commitValidator committedRef context@ScriptContext{scriptContextTxIn
  where
   checkCommittedValue =
     traceIfFalse "lockedValue does not match" $
-      lockedValue == initialValue + committedValue
+      traceIfFalse ("lockedValue: " `appendString` debugValue lockedValue) $
+        traceIfFalse ("initialValue: " `appendString` debugValue initialValue) $
+          traceIfFalse ("comittedValue: " `appendString` debugValue committedValue) $
+            lockedValue == initialValue + committedValue
 
   checkLockedCommit =
     case (committedTxOut, lockedCommit) of
@@ -121,8 +128,9 @@ checkCommit commitValidator committedRef context@ScriptContext{scriptContextTxIn
       (Just{}, Nothing) ->
         traceError "committed TxOut, but nothing in output datum"
       (Just (ref, txOut), Just Commit{input, preSerializedOutput}) ->
-        Builtins.serialiseData (toBuiltinData txOut) == preSerializedOutput
-          && ref == input
+        traceIfFalse "mismatch committed TxOut in datum" $
+          Builtins.serialiseData (toBuiltinData txOut) == preSerializedOutput
+            && ref == input
 
   initialValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput context
@@ -152,6 +160,27 @@ checkCommit commitValidator committedRef context@ScriptContext{scriptContextTxIn
                     mCommit
       _ -> traceError "expected single commit output"
 
+  debugValue v =
+    debugInteger . assetClassValueOf v $ assetClass adaSymbol adaToken
+
+-- | Show an 'Integer' as decimal number. This is very inefficient and only
+-- should be used for debugging.
+debugInteger :: Integer -> BuiltinString
+debugInteger i
+  | i == 0 = "0"
+  | i == 1 = "1"
+  | i == 2 = "2"
+  | i == 3 = "3"
+  | i == 4 = "4"
+  | i == 5 = "5"
+  | i == 6 = "6"
+  | i == 7 = "7"
+  | i == 8 = "8"
+  | i == 9 = "9"
+  | i >= 10 = debugInteger (i `quotient` 10) `appendString` "0"
+  | otherwise = "-" `appendString` debugInteger (negate i)
+{-# INLINEABLE debugInteger #-}
+
 compiledValidator :: CompiledCode ValidatorType
 compiledValidator =
   $$(PlutusTx.compile [||wrap . validator||])

From 386f883148785f8d0451ab17c64fd882a1484677 Mon Sep 17 00:00:00 2001
From: Pascal Grange <pascal@grange.nom.fr>
Date: Thu, 5 Jan 2023 09:20:30 +0000
Subject: [PATCH 48/85] JSON format changed

---
 hydra-node/golden/ChainState.json | 84 +++++++++++++++----------------
 1 file changed, 42 insertions(+), 42 deletions(-)

diff --git a/hydra-node/golden/ChainState.json b/hydra-node/golden/ChainState.json
index c85c14215f5..b9ddc8635d3 100644
--- a/hydra-node/golden/ChainState.json
+++ b/hydra-node/golden/ChainState.json
@@ -2,84 +2,84 @@
     "samples": [
         {
             "contents": {
-                "closedHeadId": "c440d10fb47957e210786e0a69e53d47ea741bd3db04104cb2aa76ea",
                 "closedHeadTokenScript": {
-                    "cborHex": "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+                    "cborHex": 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                     "description": "",
                     "type": "PlutusScriptV2"
                 },
                 "closedThreadOutput": {
-                    "closedContestationDeadline": 6740958000,
+                    "closedContestationDeadline": 15656284000,
                     "closedParties": [
                         {
                             "vkey": "f8c8f4ccac9acf1b6fc3cdc9370d031a1420dbc73005ef1abfdc06171fe22f3c"
                         }
                     ],
                     "closedThreadUTxO": [
-                        "b47902234a0e9bcc43109a1e8d9d5d3f58cd186dd847308122c45aae86568c7d#0",
+                        "5ea92b202217cea4971cbe735f2dce70b7307b30247bf54b49f8131bfce61e84#0",
                         {
-                            "address": "addr_test1wpvdxve27gk4ylwyf7t6xn3c7swrfzwz9uv0akwnpctkc4qdhgye0",
+                            "address": "addr_test1wr3rfk300e4r3uj5sun7v8nansxs5jhn5l2u5x68cyna4rg6t5je4",
                             "datum": null,
-                            "datumhash": "ef5a41868569fa343fa34fc4d980526343832b71441fa46addefa453abb17962",
+                            "datumhash": "9636457d3c42a7c733fe8a69f2247ab26c03dc5c12b90c3a6bfdc1104575892d",
                             "inlineDatum": null,
                             "referenceScript": null,
                             "value": {
-                                "c440d10fb47957e210786e0a69e53d47ea741bd3db04104cb2aa76ea": {
+                                "ab0eaa8b186d32191e173a0c553ebc12286dde3431fc649d7d8cd5a3": {
                                     "4879647261486561645631": 1,
                                     "704c2afaff23ee3d1769b5dd2855ca1dc6e65ca3856e0cfc5986c69a": 1
                                 },
                                 "lovelace": 4000000
                             }
                         },
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+                        "d87b9f9f5820f8c8f4ccac9acf1b6fc3cdc9370d031a1420dbc73005ef1abfdc06171fe22f3cff0f58208d3a3d466455d4ecd823af3e1bb77aff9034535aeed63d87edca9befe3950f7b1b00000003a52fef60581cab0eaa8b186d32191e173a0c553ebc12286dde3431fc649d7d8cd5a3ff"
                     ]
-                }
+                },
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             },
             "tag": "Closed"
         },
         {
             "contents": {
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                 "initialCommits": [],
-                "initialHeadId": "7456b57c4c721b13da3fd812eec5da5f7a843ecf5d663c4fef972461",
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                     "description": "",
                     "type": "PlutusScriptV2"
                 },
                 "initialInitials": [
                     [
-                        "3f30e71e2621d2ae8006a66e2f7f836cd4bbf7af7d342ca09b39612d9288fa48#1",
+                        "55e4ca924d4332bb3fe053415a26d6ad51057ebcf9cfc926cb150bedfe1b9628#1",
                         {
-                            "address": "addr_test1wzxh8uf9892xduwks4cyglj0fwru6ceuvu508qpt9h8u5gqn0pu2f",
+                            "address": "addr_test1wr4dlvpkfq790yl8shp8npw30jegr988lj6950pkrys3ducv0989f",
                             "datum": null,
-                            "datumhash": "923918e403bf43c34b4ef6b48eb2ee04babed17320d8d1b9ff9ad086e86f44ec",
+                            "datumhash": "1e6a25553455382f5a41d1d46d2738fd65eca97ef6c805df0b4a96b728661a59",
                             "inlineDatum": null,
                             "referenceScript": null,
                             "value": {
-                                "7456b57c4c721b13da3fd812eec5da5f7a843ecf5d663c4fef972461": {
+                                "ed94edd7baa9736437d99181155224008093e9efdb4e2a1762331fb5": {
                                     "3748be4923b3d33e8c1ec37b8a2f408f8152a76619b4238a21fd2823": 1
                                 },
                                 "lovelace": 2000000
                             }
                         },
-                        "d87980"
+                        "d8799f581ced94edd7baa9736437d99181155224008093e9efdb4e2a1762331fb5ff"
                     ],
                     [
-                        "3f30e71e2621d2ae8006a66e2f7f836cd4bbf7af7d342ca09b39612d9288fa48#2",
+                        "55e4ca924d4332bb3fe053415a26d6ad51057ebcf9cfc926cb150bedfe1b9628#2",
                         {
-                            "address": "addr_test1wzxh8uf9892xduwks4cyglj0fwru6ceuvu508qpt9h8u5gqn0pu2f",
+                            "address": "addr_test1wr4dlvpkfq790yl8shp8npw30jegr988lj6950pkrys3ducv0989f",
                             "datum": null,
-                            "datumhash": "923918e403bf43c34b4ef6b48eb2ee04babed17320d8d1b9ff9ad086e86f44ec",
+                            "datumhash": "1e6a25553455382f5a41d1d46d2738fd65eca97ef6c805df0b4a96b728661a59",
                             "inlineDatum": null,
                             "referenceScript": null,
                             "value": {
-                                "7456b57c4c721b13da3fd812eec5da5f7a843ecf5d663c4fef972461": {
+                                "ed94edd7baa9736437d99181155224008093e9efdb4e2a1762331fb5": {
                                     "e6934d89e5b695054430980e1d4aa02257556d56b3f4a02021af2a20": 1
                                 },
                                 "lovelace": 2000000
                             }
                         },
-                        "d87980"
+                        "d8799f581ced94edd7baa9736437d99181155224008093e9efdb4e2a1762331fb5ff"
                     ]
                 ],
                 "initialThreadOutput": {
@@ -93,21 +93,21 @@
                         }
                     ],
                     "initialThreadUTxO": [
-                        "3f30e71e2621d2ae8006a66e2f7f836cd4bbf7af7d342ca09b39612d9288fa48#0",
+                        "55e4ca924d4332bb3fe053415a26d6ad51057ebcf9cfc926cb150bedfe1b9628#0",
                         {
-                            "address": "addr_test1wpvdxve27gk4ylwyf7t6xn3c7swrfzwz9uv0akwnpctkc4qdhgye0",
+                            "address": "addr_test1wr3rfk300e4r3uj5sun7v8nansxs5jhn5l2u5x68cyna4rg6t5je4",
                             "datum": null,
-                            "datumhash": "dc7feb831953b60034bc6d5830d07e3969ab2b60b1069635bfb8ce8ccae156bf",
+                            "datumhash": "d5129cd8347cc47d4471b291fa96eef2ce41e906796d0400ec171927599831ab",
                             "inlineDatum": null,
                             "referenceScript": null,
                             "value": {
-                                "7456b57c4c721b13da3fd812eec5da5f7a843ecf5d663c4fef972461": {
+                                "ed94edd7baa9736437d99181155224008093e9efdb4e2a1762331fb5": {
                                     "4879647261486561645631": 1
                                 },
                                 "lovelace": 2000000
                             }
                         },
-                        "d8799fd8799f1a03cfccb0ff9f5820ca07d7052b56498ed392538ccb557d0d5c3aedc53c9c8deac58ffd4f5f8a251c5820757fa97c0850f2faf18b7688ec48969977346230310ed8aad800751820665d35ffff"
+                        "d8799fd8799f1a03cfccb0ff9f5820ca07d7052b56498ed392538ccb557d0d5c3aedc53c9c8deac58ffd4f5f8a251c5820757fa97c0850f2faf18b7688ec48969977346230310ed8aad800751820665d35ff581ced94edd7baa9736437d99181155224008093e9efdb4e2a1762331fb5ff"
                     ]
                 }
             },
@@ -115,9 +115,9 @@
         },
         {
             "contents": {
-                "headId": "10167e37be3ed75e835f7f85be3dfd7b64e78a7cec4d4b1c8066697a",
+                "headId": "a965f52723410ea2854572dff26c171b101bfe7c3a3a032fc19ee50c",
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                     "description": "",
                     "type": "PlutusScriptV2"
                 },
@@ -135,15 +135,15 @@
                         }
                     ],
                     "openThreadUTxO": [
-                        "ddf863ec58160a36d625efb597d1a58d33474c8e80f5cfc3034cd1f5d6987f1f#0",
+                        "7e84c28b018d2cefcd7b436dc6016a51b3e75b93964376d06aaaf930ca34da0f#0",
                         {
-                            "address": "addr_test1wpvdxve27gk4ylwyf7t6xn3c7swrfzwz9uv0akwnpctkc4qdhgye0",
+                            "address": "addr_test1wr3rfk300e4r3uj5sun7v8nansxs5jhn5l2u5x68cyna4rg6t5je4",
                             "datum": null,
-                            "datumhash": "ae799ea484d888315dc52f42bc55fef9abd6a41d4d570bc67cbfff3d6a022400",
+                            "datumhash": "f8e67eee16fc30675232a7d61d77a902e8177e81570db12569adeae6d40a9484",
                             "inlineDatum": null,
                             "referenceScript": null,
                             "value": {
-                                "10167e37be3ed75e835f7f85be3dfd7b64e78a7cec4d4b1c8066697a": {
+                                "a965f52723410ea2854572dff26c171b101bfe7c3a3a032fc19ee50c": {
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                                     "3563cc48c4ebdff1ed2183613fe25eb78b9363889feb6b3f830d549c": 1,
                                     "4879647261486561645631": 1,
@@ -152,7 +152,7 @@
                                 "lovelace": 8000001
                             }
                         },
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+                        "d87a9fd8799f1a05265c00ff9f5820376642a25f2f786121f7e32279f2f472b3796d80e7d01ae7faed1b71547a812c58202a01537ef14071a99a1576165a1a551ce5c1cd10b44aa7c86493695a42f0609958209780849a8171fcc6aea09fc1eb4e2d242aabb9956d98c8e22e556b6e9d791eafff582097439fb660df46b73d128f88797d1705554af62c239752e9cabe3d78c94f7298581ca965f52723410ea2854572dff26c171b101bfe7c3a3a032fc19ee50cff"
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                 "openUtxoHash": "97439fb660df46b73d128f88797d1705554af62c239752e9cabe3d78c94f7298"
@@ -164,14 +164,13 @@
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         {
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                 "closedHeadTokenScript": {
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                     "description": "",
                     "type": "PlutusScriptV2"
                 },
                 "closedThreadOutput": {
-                    "closedContestationDeadline": 10949447000,
+                    "closedContestationDeadline": 6481402000,
                     "closedParties": [
                         {
                             "vkey": "aad76873b303431ad76a022433659b94f69fb915335847d5a356fe5cfc1042d5"
@@ -181,18 +180,18 @@
                         }
                     ],
                     "closedThreadUTxO": [
-                        "b5ad938fe3e104a62094f56a8f8ee6356a3cba85f4f421709ac1d7b0823fc635#0",
+                        "5a0cbdc0aad24ea78ddaec57f8cc1dea796991937ffd28e94c1e97a448199411#0",
                         {
-                            "address": "addr_test1wpvdxve27gk4ylwyf7t6xn3c7swrfzwz9uv0akwnpctkc4qdhgye0",
+                            "address": "addr_test1wr3rfk300e4r3uj5sun7v8nansxs5jhn5l2u5x68cyna4rg6t5je4",
                             "datum": null,
-                            "datumhash": "56c7f31a8107bec70139bb0a4a3228fc8a757c927e8299619eff0fefcd0cc13c",
+                            "datumhash": "0f91452f6637e8813ea024f75e1dd30bb04710bc046ee1c236824c43e58616e7",
                             "inlineDatum": null,
                             "referenceScript": null,
                             "value": {
                                 "3542acb3a64d80c29302260d62c3b87a742ad14abf855ebc6733081e": {
                                     "00": 1
                                 },
-                                "d8e8fae65d65524c8967a61152799fb006493a2e6bfd4081286cd00b": {
+                                "b07e99ff93de8256222c942dd2e1ac25012337ffa3bf0d69969a6166": {
                                     "4879647261486561645631": 1,
                                     "7cd6ce1289f8e28723ef6c0f070ed38b264188517b4e4c25286d0e51": 1,
                                     "bd9450d233aff3db5bb819fc6003ebb6d4649967ab541ada7db8f322": 1
@@ -200,9 +199,10 @@
                                 "lovelace": 6000001
                             }
                         },
-                        "d87b9f9f5820aad76873b303431ad76a022433659b94f69fb915335847d5a356fe5cfc1042d558204a9041b3d7f729976726a88ff2d8c79dd592ea457692098ddac982a698dc3bdfff12582007e63099c410c0457c076f486d1a034c75e61e88e56343dadc3637828cdd06701b000000028ca34d58ff"
+                        "d87b9f9f5820aad76873b303431ad76a022433659b94f69fb915335847d5a356fe5cfc1042d558204a9041b3d7f729976726a88ff2d8c79dd592ea457692098ddac982a698dc3bdfff12582007e63099c410c0457c076f486d1a034c75e61e88e56343dadc3637828cdd06701b0000000182525890581cb07e99ff93de8256222c942dd2e1ac25012337ffa3bf0d69969a6166ff"
                     ]
-                }
+                },
+                "headId": "b07e99ff93de8256222c942dd2e1ac25012337ffa3bf0d69969a6166"
             },
             "tag": "Closed"
         }

From 8898f5ddc7eb6cd3d3ff30366e06b710f69df6b7 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 5 Jan 2023 16:09:08 +0100
Subject: [PATCH 49/85] Rename initialOutput to healthyInitialOutput

---
 hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
index f5708028c4c..c82b3a890df 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
@@ -37,7 +37,7 @@ healthyCommitTx =
   (tx, lookupUTxO)
  where
   lookupUTxO =
-    UTxO.singleton (Fixture.testSeedInput, toUTxOContext initialOutput)
+    UTxO.singleton (Fixture.testSeedInput, toUTxOContext healthyInitialOutput)
       <> UTxO.singleton healthyCommittedUTxO
       <> registryUTxO scriptRegistry
   tx =
@@ -47,7 +47,7 @@ healthyCommitTx =
       (mkHeadId Fixture.testPolicyId)
       commitParty
       (Just healthyCommittedUTxO)
-      (Fixture.testSeedInput, toUTxOContext initialOutput, initialPubKeyHash)
+      (Fixture.testSeedInput, toUTxOContext healthyInitialOutput, initialPubKeyHash)
 
   scriptRegistry = genScriptRegistry `generateWith` 42
 
@@ -59,8 +59,8 @@ healthyCommitTx =
 commitVerificationKey :: VerificationKey PaymentKey
 commitVerificationKey = generateWith arbitrary 42
 
-initialOutput :: TxOut CtxTx
-initialOutput = mkInitialOutput Fixture.testNetworkId Fixture.testPolicyId commitVerificationKey
+healthyInitialOutput :: TxOut CtxTx
+healthyInitialOutput = mkInitialOutput Fixture.testNetworkId Fixture.testPolicyId commitVerificationKey
 
 -- NOTE: An 8₳ output which is currently addressed to some arbitrary key.
 healthyCommittedUTxO :: (TxIn, TxOut CtxUTxO)
@@ -103,7 +103,7 @@ genCommitMutation (tx, _utxo) =
             [ ChangeOutput 0 (replacePolicyIdWith Fixture.testPolicyId otherHeadId commitTxOut)
             , ChangeInput
                 Fixture.testSeedInput
-                (toUTxOContext $ replacePolicyIdWith Fixture.testPolicyId otherHeadId initialOutput)
+                (toUTxOContext $ replacePolicyIdWith Fixture.testPolicyId otherHeadId healthyInitialOutput)
                 (Just $ toScriptData $ Initial.ViaCommit $ Just $ toPlutusTxOutRef committedTxIn)
             ]
     ]

From c42d0515f83876f7b6e7d63cb0995678da1ee63a Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 5 Jan 2023 16:13:03 +0100
Subject: [PATCH 50/85] Bring back initialInput

---
 hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
index c82b3a890df..4d5efc440a8 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
@@ -37,7 +37,7 @@ healthyCommitTx =
   (tx, lookupUTxO)
  where
   lookupUTxO =
-    UTxO.singleton (Fixture.testSeedInput, toUTxOContext healthyInitialOutput)
+    UTxO.singleton (initialInput, toUTxOContext healthyInitialOutput)
       <> UTxO.singleton healthyCommittedUTxO
       <> registryUTxO scriptRegistry
   tx =
@@ -47,7 +47,7 @@ healthyCommitTx =
       (mkHeadId Fixture.testPolicyId)
       commitParty
       (Just healthyCommittedUTxO)
-      (Fixture.testSeedInput, toUTxOContext healthyInitialOutput, initialPubKeyHash)
+      (initialInput, toUTxOContext healthyInitialOutput, initialPubKeyHash)
 
   scriptRegistry = genScriptRegistry `generateWith` 42
 
@@ -59,6 +59,9 @@ healthyCommitTx =
 commitVerificationKey :: VerificationKey PaymentKey
 commitVerificationKey = generateWith arbitrary 42
 
+initialInput :: TxIn
+initialInput = generateWith arbitrary 42
+
 healthyInitialOutput :: TxOut CtxTx
 healthyInitialOutput = mkInitialOutput Fixture.testNetworkId Fixture.testPolicyId commitVerificationKey
 
@@ -97,12 +100,12 @@ genCommitMutation (tx, _utxo) =
         newSigner <- verificationKeyHash <$> genVerificationKey
         pure $ ChangeRequiredSigners [newSigner]
     , SomeMutation MutateHeadId <$> do
-        otherHeadId <- fmap headPolicyId (arbitrary `suchThat` (/= Fixture.testSeedInput))
+        otherHeadId <- fmap headPolicyId (arbitrary `suchThat` (/= initialInput))
         pure $
           Changes
             [ ChangeOutput 0 (replacePolicyIdWith Fixture.testPolicyId otherHeadId commitTxOut)
             , ChangeInput
-                Fixture.testSeedInput
+                initialInput
                 (toUTxOContext $ replacePolicyIdWith Fixture.testPolicyId otherHeadId healthyInitialOutput)
                 (Just $ toScriptData $ Initial.ViaCommit $ Just $ toPlutusTxOutRef committedTxIn)
             ]

From b282a6850107a8aa64f2e836a4f9f07c0c12dbe6 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 5 Jan 2023 16:16:12 +0100
Subject: [PATCH 51/85] Keep headTxOutDatum local

---
 hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
index 26c07df975e..d5e778beb8f 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
@@ -65,13 +65,12 @@ healthyContestTx =
       , closedContestationDeadline = posixFromUTCTime healthyContestationDeadline
       }
 
-headTxOutDatum :: TxOutDatum CtxUTxO
-headTxOutDatum = toUTxOContext (mkTxOutDatum healthyClosedState)
-
 headResolvedInput :: TxOut CtxUTxO
 headResolvedInput =
   mkHeadOutput testNetworkId testPolicyId headTxOutDatum
     & addParticipationTokens healthyParties
+ where
+  headTxOutDatum = toUTxOContext (mkTxOutDatum healthyClosedState)
 
 healthyContestSnapshot :: Snapshot Tx
 healthyContestSnapshot =

From 997835e3aaa9f2dfc14f27aa9ed09b743e166d33 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 5 Jan 2023 16:17:16 +0100
Subject: [PATCH 52/85] Rename headResolvedInput to healthyHeadTxOut

---
 hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
index d5e778beb8f..b40fc86719a 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
@@ -55,18 +55,18 @@ healthyContestTx =
 
   headDatum = fromPlutusData $ toData healthyClosedState
 
-  lookupUTxO = UTxO.singleton (testSeedInput, headResolvedInput)
+  lookupUTxO = UTxO.singleton (testSeedInput, healthyHeadTxOut)
 
   closedThreadOutput =
     ClosedThreadOutput
-      { closedThreadUTxO = (testSeedInput, headResolvedInput, headDatum)
+      { closedThreadUTxO = (testSeedInput, healthyHeadTxOut, headDatum)
       , closedParties =
           healthyOnChainParties
       , closedContestationDeadline = posixFromUTCTime healthyContestationDeadline
       }
 
-headResolvedInput :: TxOut CtxUTxO
-headResolvedInput =
+healthyHeadTxOut :: TxOut CtxUTxO
+healthyHeadTxOut =
   mkHeadOutput testNetworkId testPolicyId headTxOutDatum
     & addParticipationTokens healthyParties
  where
@@ -213,7 +213,7 @@ genContestMutation
               [ ChangeOutput 0 (replacePolicyIdWith testPolicyId otherHeadId headTxOut)
               , ChangeInput
                   testSeedInput
-                  (replacePolicyIdWith testPolicyId otherHeadId headResolvedInput)
+                  (replacePolicyIdWith testPolicyId otherHeadId healthyHeadTxOut)
                   (Just $ toScriptData healthyClosedState)
               ]
       ]

From 803689bc4d93e28cdca19e201b5d145481a2e3e9 Mon Sep 17 00:00:00 2001
From: Franco Testagrossa <franco.testagrossa@iohk.io>
Date: Thu, 5 Jan 2023 12:33:20 -0300
Subject: [PATCH 53/85] do not limit to a single token value

Co-authored-by: Sebastian Nagel <ch1bo@users.noreply.github.com>
---
 hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
index 0acbfc5c3b9..9c04f853b95 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
@@ -578,6 +578,6 @@ replacePolicyIdWith originalHeadId otherHeadId output =
   let value = txOutValue output
       newValue = valueFromList $ swapPolicyId <$> valueToList value
       swapPolicyId = \case
-        (AssetId policyId t, q) | policyId == originalHeadId, q == 1 -> (AssetId otherHeadId t, q)
+        (AssetId policyId t, q) | policyId == originalHeadId -> (AssetId otherHeadId t, q)
         v -> v
    in output{txOutValue = newValue}

From 7d9e740656ceb729efcdca5f2e1f450a7caec889 Mon Sep 17 00:00:00 2001
From: Franco Testagrossa <franco.testagrossa@iohk.io>
Date: Thu, 5 Jan 2023 12:37:12 -0300
Subject: [PATCH 54/85] update comment on commit mutation

---
 hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
index 4d5efc440a8..6efe82f6419 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
@@ -77,7 +77,7 @@ data CommitMutation
   | MutateCommittedValue
   | MutateCommittedAddress
   | MutateRequiredSigner
-  | -- | Change the policy Id of the PT both in input and output
+  | -- | Change the policy Id of the PT and ST tokens both in input and output
     MutateHeadId
   deriving (Generic, Show, Enum, Bounded)
 
@@ -90,7 +90,6 @@ genCommitMutation (tx, _utxo) =
     , SomeMutation MutateCommittedValue <$> do
         mutatedValue <- genValue `suchThat` (/= committedOutputValue)
         let mutatedOutput = modifyTxOutValue (const mutatedValue) committedTxOut
-
         pure $ ChangeInput committedTxIn mutatedOutput Nothing
     , SomeMutation MutateCommittedAddress <$> do
         mutatedAddress <- genAddressInEra Fixture.testNetworkId `suchThat` (/= committedAddress)

From bb1940908d9f153716291ea020e8ae6e2fa061f1 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 5 Jan 2023 17:58:26 +0100
Subject: [PATCH 55/85] Extract hydraHeadV1 and hasST into separate module

---
 hydra-plutus/src/Hydra/Contract/Head.hs | 19 ++---------------
 hydra-plutus/src/Hydra/Contract/Util.hs | 27 +++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 17 deletions(-)
 create mode 100644 hydra-plutus/src/Hydra/Contract/Util.hs

diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index 785aa047513..10e7e25a342 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -10,6 +10,7 @@ import PlutusTx.Prelude
 import Hydra.Contract.Commit (Commit (..))
 import qualified Hydra.Contract.Commit as Commit
 import Hydra.Contract.HeadState (Input (..), Signature, SnapshotNumber, State (..))
+import Hydra.Contract.Util (hasST)
 import Hydra.Data.ContestationPeriod (ContestationPeriod, addContestationPeriod, milliseconds)
 import Hydra.Data.Party (Party (vkey))
 import Plutus.Extras (ValidatorType, scriptValidatorHash, wrapValidator)
@@ -53,9 +54,6 @@ import Plutus.V1.Ledger.Value (assetClass, assetClassValue, valueOf)
 type DatumType = State
 type RedeemerType = Input
 
-hydraHeadV1 :: BuiltinByteString
-hydraHeadV1 = "HydraHeadV1"
-
 --------------------------------------------------------------------------------
 -- Validators
 --------------------------------------------------------------------------------
@@ -191,7 +189,7 @@ checkCollectCom ctx@ScriptContext{scriptContextTxInfo = txInfo} Initial{contesta
   commitDatum o = do
     let d = findTxOutDatum txInfo o
     case fromBuiltinData @Commit.DatumType $ getDatum d of
-      Just (_p, _, mCommit) ->
+      Just (_p, _, mCommit, _headId) ->
         mCommit
       Nothing ->
         traceError "commitDatum failed fromBuiltinData"
@@ -383,19 +381,6 @@ makeContestationDeadline cperiod ScriptContext{scriptContextTxInfo} =
     _ -> traceError "no upper bound validaty interval defined for close"
 {-# INLINEABLE makeContestationDeadline #-}
 
--- | Checks that the output contains the ST token with the head 'CurrencySymbol'
--- and 'TokenName' of 'hydraHeadV1'
-hasST :: CurrencySymbol -> Value -> Bool
-hasST headPolicyId v =
-  isJust $
-    find
-      (\(cs, tokenMap) -> cs == headPolicyId && hasHydraToken tokenMap)
-      (Map.toList $ getValue v)
- where
-  hasHydraToken tm =
-    isJust $ find (\(tn, q) -> q == 1 && TokenName hydraHeadV1 == tn) (Map.toList tm)
-{-# INLINEABLE hasST #-}
-
 mkHeadAddress :: ScriptContext -> Address
 mkHeadAddress ctx =
   let headInput =
diff --git a/hydra-plutus/src/Hydra/Contract/Util.hs b/hydra-plutus/src/Hydra/Contract/Util.hs
new file mode 100644
index 00000000000..31d9dbf802f
--- /dev/null
+++ b/hydra-plutus/src/Hydra/Contract/Util.hs
@@ -0,0 +1,27 @@
+{-# OPTIONS_GHC -fno-specialize #-}
+
+module Hydra.Contract.Util where
+
+import Plutus.V2.Ledger.Api (
+  CurrencySymbol,
+  TokenName (..),
+  Value (getValue),
+ )
+import qualified PlutusTx.AssocMap as Map
+import PlutusTx.Prelude
+
+hydraHeadV1 :: BuiltinByteString
+hydraHeadV1 = "HydraHeadV1"
+
+-- | Checks that the output contains the ST token with the head 'CurrencySymbol'
+-- and 'TokenName' of 'hydraHeadV1'
+hasST :: CurrencySymbol -> Value -> Bool
+hasST headPolicyId v =
+  isJust $
+    find
+      (\(cs, tokenMap) -> cs == headPolicyId && hasHydraToken tokenMap)
+      (Map.toList $ getValue v)
+ where
+  hasHydraToken tm =
+    isJust $ find (\(tn, q) -> q == 1 && TokenName hydraHeadV1 == tn) (Map.toList tm)
+{-# INLINEABLE hasST #-}

From b323922b973e66b7dc0ffd74fba2879bdd35db3b Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Thu, 5 Jan 2023 17:59:02 +0100
Subject: [PATCH 56/85] Add CurrencySymbol to the commit datum

---
 hydra-node/src/Hydra/Chain/Direct/Tx.hs        | 18 ++++++++++--------
 .../Hydra/Chain/Direct/Contract/CollectCom.hs  |  2 +-
 .../Hydra/Chain/Direct/Contract/Mutation.hs    | 13 +++++++++----
 hydra-node/test/Hydra/Chain/Direct/TxSpec.hs   |  7 ++++---
 hydra-plutus/exe/inspect-script/Main.hs        |  1 +
 hydra-plutus/hydra-plutus.cabal                |  1 +
 hydra-plutus/src/Hydra/Contract/Commit.hs      | 16 ++++++++++------
 hydra-plutus/src/Hydra/Contract/Initial.hs     |  2 +-
 8 files changed, 37 insertions(+), 23 deletions(-)

diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index cf4b30a56e1..2b0b85c2906 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -27,6 +27,7 @@ import qualified Hydra.Contract.HeadState as Head
 import qualified Hydra.Contract.HeadTokens as HeadTokens
 import qualified Hydra.Contract.Initial as Initial
 import Hydra.Contract.MintAction (MintAction (Burn, Mint))
+import Hydra.Contract.Util (hydraHeadV1)
 import Hydra.Crypto (MultiSignature, toPlutusSignatures)
 import Hydra.Data.ContestationPeriod (addContestationPeriod, posixFromUTCTime)
 import qualified Hydra.Data.ContestationPeriod as OnChain
@@ -100,7 +101,7 @@ mkHeadTokenScript =
   fromPlutusScript @PlutusScriptV2 . HeadTokens.validatorScript . toPlutusTxOutRef
 
 hydraHeadV1AssetName :: AssetName
-hydraHeadV1AssetName = AssetName (fromBuiltin Head.hydraHeadV1)
+hydraHeadV1AssetName = AssetName (fromBuiltin hydraHeadV1)
 
 -- FIXME: sould not be hardcoded
 headValue :: Value
@@ -212,11 +213,12 @@ commitTx scriptRegistry networkId headId party utxo (initialInput, out, vkh) =
   commitValue =
     txOutValue out <> maybe mempty (txOutValue . snd) utxo
   commitDatum =
-    mkTxOutDatum $ mkCommitDatum party Head.validatorHash utxo
+    -- TODO: pass in correct headId
+    mkTxOutDatum $ mkCommitDatum party Head.validatorHash utxo (CurrencySymbol "")
 
-mkCommitDatum :: Party -> Plutus.ValidatorHash -> Maybe (TxIn, TxOut CtxUTxO) -> Plutus.Datum
-mkCommitDatum party headValidatorHash utxo =
-  Commit.datum (partyToChain party, headValidatorHash, serializedUTxO)
+mkCommitDatum :: Party -> Plutus.ValidatorHash -> Maybe (TxIn, TxOut CtxUTxO) -> CurrencySymbol -> Plutus.Datum
+mkCommitDatum party headValidatorHash utxo headId =
+  Commit.datum (partyToChain party, headValidatorHash, serializedUTxO, headId)
  where
   serializedUTxO = case utxo of
     Nothing ->
@@ -276,7 +278,7 @@ collectComTx networkId vk initialThreadOutput commits headId =
   extractCommit d =
     case fromData $ toPlutusData d of
       Nothing -> error "SNAFU"
-      Just ((_, _, Just o) :: Commit.DatumType) -> Just o
+      Just ((_, _, Just o, _) :: Commit.DatumType) -> Just o
       _ -> Nothing
 
   utxoHash =
@@ -557,7 +559,7 @@ abortTx scriptRegistry vk (headInput, initialHeadOutput, ScriptDatumForTxIn -> h
   mkCommitOutput :: ScriptData -> Maybe (TxOut CtxTx)
   mkCommitOutput x =
     case fromData @Commit.DatumType $ toPlutusData x of
-      Just (_party, _validatorHash, serialisedTxOut) ->
+      Just (_party, _validatorHash, serialisedTxOut, _headId) ->
         toTxContext <$> convertTxOut serialisedTxOut
       Nothing -> error "Invalid Commit datum"
 
@@ -677,7 +679,7 @@ observeCommitTx networkId initials tx = do
 
   (commitIn, commitOut) <- findTxOutByAddress commitAddress tx
   dat <- getScriptData commitOut
-  (onChainParty, _, onChainCommit) <- fromData @Commit.DatumType $ toPlutusData dat
+  (onChainParty, _, onChainCommit, _headId) <- fromData @Commit.DatumType $ toPlutusData dat
   party <- partyFromChain onChainParty
   let mCommittedTxOut = convertTxOut onChainCommit
 
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
index 6b62e28be85..74a8d4426c4 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
@@ -157,7 +157,7 @@ healthyCommitOutput party committed =
         [ (AssetId testPolicyId (assetNameFromVerificationKey cardanoVk), 1)
         ]
   commitDatum =
-    mkCommitDatum party Head.validatorHash (Just committed)
+    mkCommitDatum party Head.validatorHash (Just committed) (toPlutusCurrencySymbol $ headPolicyId healthyHeadInput)
 
 data CollectComMutation
   = MutateOpenUTxOHash
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
index 9c04f853b95..d2c99eca891 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
@@ -193,10 +193,15 @@ propTransactionDoesNotValidate (tx, lookupUTxO) =
         Left _ ->
           property True
         Right redeemerReport ->
-          any isLeft (Map.elems redeemerReport)
-            & counterexample ("Tx: " <> renderTxWithUTxO lookupUTxO tx)
-            & counterexample ("Redeemer report: " <> show redeemerReport)
-            & counterexample "Phase-2 validation should have failed"
+          trace "Errors:" $
+            trace
+              (show $ Map.elems redeemerReport)
+              any
+              isLeft
+              (Map.elems redeemerReport)
+              & counterexample ("Tx: " <> renderTxWithUTxO lookupUTxO tx)
+              & counterexample ("Redeemer report: " <> show redeemerReport)
+              & counterexample "Phase-2 validation should have failed"
 
 -- | A 'Property' checking some (transaction, UTxO) pair is valid.
 propTransactionValidates :: (Tx, UTxO) -> Property
diff --git a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
index 360cb234d5d..44ab5a8cee7 100644
--- a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
@@ -266,9 +266,9 @@ generateCommitUTxOs parties = do
         TxOut
           (mkScriptAddress @PlutusScriptV2 testNetworkId commitScript)
           commitValue
-          (mkTxOutDatum commitDatum)
+          (mkTxOutDatum $ commitDatum utxo)
           ReferenceScriptNone
-    , fromPlutusData (toData commitDatum)
+    , fromPlutusData (toData $ commitDatum utxo)
     , maybe mempty (UTxO.fromPairs . pure) utxo
     )
    where
@@ -281,7 +281,8 @@ generateCommitUTxOs parties = do
             ]
         ]
     commitScript = fromPlutusScript Commit.validatorScript
-    commitDatum = mkCommitDatum party Head.validatorHash utxo
+    commitDatum (Just (input, _)) = mkCommitDatum party Head.validatorHash utxo (toPlutusCurrencySymbol $ headPolicyId input)
+    commitDatum Nothing = error "Missing utxo"
 
 prettyEvaluationReport :: EvaluationReport -> String
 prettyEvaluationReport (Map.toList -> xs) =
diff --git a/hydra-plutus/exe/inspect-script/Main.hs b/hydra-plutus/exe/inspect-script/Main.hs
index 1a1565f4b63..2c6fadf5c8a 100644
--- a/hydra-plutus/exe/inspect-script/Main.hs
+++ b/hydra-plutus/exe/inspect-script/Main.hs
@@ -17,6 +17,7 @@ import qualified Hydra.Contract.Hash as Hash
 import Hydra.Contract.Head as Head
 import Hydra.Contract.HeadState as Head
 import Hydra.Contract.Initial as Initial
+import Hydra.Contract.Util (hydraHeadV1)
 import Plutus.V2.Ledger.Api (CurrencySymbol (CurrencySymbol), Data, Script, toData)
 import PlutusTx (getPlc)
 import PlutusTx.Code (CompiledCode)
diff --git a/hydra-plutus/hydra-plutus.cabal b/hydra-plutus/hydra-plutus.cabal
index 6e50d6e5bd3..b85c0cb355c 100644
--- a/hydra-plutus/hydra-plutus.cabal
+++ b/hydra-plutus/hydra-plutus.cabal
@@ -80,6 +80,7 @@ library
     Hydra.Contract.HeadTokens
     Hydra.Contract.Initial
     Hydra.Contract.MintAction
+    Hydra.Contract.Util
     Hydra.Data.ContestationPeriod
     Hydra.Data.Party
     Hydra.Data.Utxo
diff --git a/hydra-plutus/src/Hydra/Contract/Commit.hs b/hydra-plutus/src/Hydra/Contract/Commit.hs
index bd289f14f77..d836e32b474 100644
--- a/hydra-plutus/src/Hydra/Contract/Commit.hs
+++ b/hydra-plutus/src/Hydra/Contract/Commit.hs
@@ -13,11 +13,13 @@ import Hydra.Cardano.Api (CtxUTxO, fromPlutusTxOut, fromPlutusTxOutRef, toPlutus
 import qualified Hydra.Cardano.Api as OffChain
 import Hydra.Cardano.Api.Network (Network (Testnet))
 import Hydra.Contract.HeadState (State (..))
+import Hydra.Contract.Util (hasST)
 import Hydra.Data.Party (Party)
 import Plutus.Extras (ValidatorType, scriptValidatorHash, wrapValidator)
 import Plutus.V2.Ledger.Api (
   Address (Address),
   Credential (ScriptCredential),
+  CurrencySymbol,
   Datum (..),
   FromData (fromBuiltinData),
   OutputDatum (..),
@@ -26,13 +28,13 @@ import Plutus.V2.Ledger.Api (
   ScriptContext (ScriptContext, scriptContextTxInfo),
   TxInInfo (txInInfoResolved),
   TxInfo (txInfoInputs, txInfoOutputs),
-  TxOut (TxOut, txOutAddress),
+  TxOut (TxOut, txOutAddress, txOutValue),
   TxOutRef,
   Validator (getValidator),
   ValidatorHash,
   mkValidatorScript,
  )
-import Plutus.V2.Ledger.Contexts (findDatum)
+import Plutus.V2.Ledger.Contexts (findDatum, findOwnInput)
 import PlutusTx (CompiledCode, fromData, toBuiltinData, toData)
 import qualified PlutusTx
 import qualified PlutusTx.Builtins as Builtins
@@ -86,7 +88,7 @@ deserializeCommit Commit{input, preSerializedOutput} =
 -- TODO: Party is not used on-chain but is needed off-chain while it's still
 -- based on mock crypto. When we move to real crypto we could simply use
 -- the PT's token name to identify the committing party
-type DatumType = (Party, ValidatorHash, Maybe Commit)
+type DatumType = (Party, ValidatorHash, Maybe Commit, CurrencySymbol)
 type RedeemerType = CommitRedeemer
 
 -- | The v_commit validator verifies that:
@@ -95,7 +97,7 @@ type RedeemerType = CommitRedeemer
 --
 --   * on abort, redistribute comitted utxo
 validator :: DatumType -> RedeemerType -> ScriptContext -> Bool
-validator (_party, headScriptHash, commit) consumer ScriptContext{scriptContextTxInfo = txInfo} =
+validator (_party, headScriptHash, commit, headId) consumer ctx@ScriptContext{scriptContextTxInfo = txInfo} =
   case txInInfoResolved <$> findHeadScript of
     Nothing -> traceError "Cannot find Head script"
     Just (TxOut _ _ d _) ->
@@ -125,9 +127,11 @@ validator (_party, headScriptHash, commit) consumer ScriptContext{scriptContextT
                             preSerializedOutput `elem` (Builtins.serialiseData . toBuiltinData <$> txInfoOutputs txInfo)
                     -- NOTE: In the Collectcom case the inclusion of the committed output 'commit' is
                     -- delegated to the 'CollectCom' script who has more information to do it.
-                    ViaCollectCom -> True
-                _ -> traceError "Head script in wrong state"
+                    ViaCollectCom -> traceIfFalse "ST is missing in the output" $ hasST headId outValue
+                _ -> True
  where
+  outValue =
+    maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
   findHeadScript = find (paytoHeadScript . txInInfoResolved) $ txInfoInputs txInfo
 
   paytoHeadScript = \case
diff --git a/hydra-plutus/src/Hydra/Contract/Initial.hs b/hydra-plutus/src/Hydra/Contract/Initial.hs
index d6426c244fe..93f3f7a8415 100644
--- a/hydra-plutus/src/Hydra/Contract/Initial.hs
+++ b/hydra-plutus/src/Hydra/Contract/Initial.hs
@@ -156,7 +156,7 @@ checkCommit commitValidator committedRef context@ScriptContext{scriptContextTxIn
               Just da ->
                 case fromBuiltinData @Commit.DatumType $ getDatum da of
                   Nothing -> traceError "expected commit datum type, got something else"
-                  Just (_party, _headScriptHash, mCommit) ->
+                  Just (_party, _headScriptHash, mCommit, _headId) ->
                     mCommit
       _ -> traceError "expected single commit output"
 

From 054ffc38a0593aaba551036b1ac95a40aa4d5ad6 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Mon, 9 Jan 2023 10:07:35 +0100
Subject: [PATCH 57/85] Check ST is present in the CollectCom commit output

---
 hydra-node/src/Hydra/Chain/Direct/Tx.hs                |  5 ++---
 .../test/Hydra/Chain/Direct/Contract/CollectCom.hs     | 10 +++++++++-
 hydra-plutus/src/Hydra/Contract/Commit.hs              |  6 ++----
 3 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index 2b0b85c2906..20a84631270 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -164,7 +164,7 @@ mkInitialOutput networkId tokenPolicyId (verificationKeyHash -> pkh) =
   initialScript =
     fromPlutusScript Initial.validatorScript
   initialDatum =
-    mkTxOutDatum $ Initial.InitialDatum $ toPlutusCurrencySymbol tokenPolicyId
+    mkTxOutDatum $ Initial.InitialDatum{headId = toPlutusCurrencySymbol tokenPolicyId}
 
 -- | Craft a commit transaction which includes the "committed" utxo as a datum.
 commitTx ::
@@ -213,8 +213,7 @@ commitTx scriptRegistry networkId headId party utxo (initialInput, out, vkh) =
   commitValue =
     txOutValue out <> maybe mempty (txOutValue . snd) utxo
   commitDatum =
-    -- TODO: pass in correct headId
-    mkTxOutDatum $ mkCommitDatum party Head.validatorHash utxo (CurrencySymbol "")
+    mkTxOutDatum $ mkCommitDatum party Head.validatorHash utxo (headIdToCurrencySymbol headId)
 
 mkCommitDatum :: Party -> Plutus.ValidatorHash -> Maybe (TxIn, TxOut CtxUTxO) -> CurrencySymbol -> Plutus.Datum
 mkCommitDatum party headValidatorHash utxo headId =
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
index 74a8d4426c4..32705ca8775 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
@@ -179,7 +179,15 @@ genCollectComMutation (tx, utxo) =
         <$> (ChangeInput (headTxIn utxo) <$> anyPayToPubKeyTxOut <*> pure Nothing)
     , SomeMutation MutateHeadTransition <$> do
         changeRedeemer <- ChangeHeadRedeemer <$> (Head.Close 0 . toBuiltin <$> genHash <*> arbitrary)
-        changeDatum <- ChangeHeadDatum <$> (Head.Open <$> arbitrary <*> arbitrary <*> (toBuiltin <$> genHash) <*> arbitrary)
+        differencCurrencySymbol <- arbitrary `suchThat` (/= toPlutusCurrencySymbol testPolicyId)
+        changeDatum <-
+          ChangeHeadDatum
+            <$> ( Head.Open
+                    <$> arbitrary
+                    <*> arbitrary
+                    <*> (toBuiltin <$> genHash)
+                    <*> pure differencCurrencySymbol
+                )
         pure $ Changes [changeRedeemer, changeDatum]
     , SomeMutation MutateNumberOfParties <$> do
         -- NOTE: This also mutates the contestation period becuase we could not
diff --git a/hydra-plutus/src/Hydra/Contract/Commit.hs b/hydra-plutus/src/Hydra/Contract/Commit.hs
index d836e32b474..96071c0ee16 100644
--- a/hydra-plutus/src/Hydra/Contract/Commit.hs
+++ b/hydra-plutus/src/Hydra/Contract/Commit.hs
@@ -100,7 +100,7 @@ validator :: DatumType -> RedeemerType -> ScriptContext -> Bool
 validator (_party, headScriptHash, commit, headId) consumer ctx@ScriptContext{scriptContextTxInfo = txInfo} =
   case txInInfoResolved <$> findHeadScript of
     Nothing -> traceError "Cannot find Head script"
-    Just (TxOut _ _ d _) ->
+    Just outValue@(TxOut _ _ d _) ->
       case d of
         NoOutputDatum -> traceError "missing datum"
         OutputDatum _ -> traceError "unexpected inline datum"
@@ -127,11 +127,9 @@ validator (_party, headScriptHash, commit, headId) consumer ctx@ScriptContext{sc
                             preSerializedOutput `elem` (Builtins.serialiseData . toBuiltinData <$> txInfoOutputs txInfo)
                     -- NOTE: In the Collectcom case the inclusion of the committed output 'commit' is
                     -- delegated to the 'CollectCom' script who has more information to do it.
-                    ViaCollectCom -> traceIfFalse "ST is missing in the output" $ hasST headId outValue
+                    ViaCollectCom -> traceIfFalse "ST is missing in the output" $ hasST headId (txOutValue outValue)
                 _ -> True
  where
-  outValue =
-    maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
   findHeadScript = find (paytoHeadScript . txInInfoResolved) $ txInfoInputs txInfo
 
   paytoHeadScript = \case

From 941456d97c826650f5ad477b7fb8d877db3b0050 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Mon, 9 Jan 2023 10:08:51 +0100
Subject: [PATCH 58/85] Remove traces

---
 .../test/Hydra/Chain/Direct/Contract/Mutation.hs  | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
index d2c99eca891..3f0ccce7e87 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
@@ -193,15 +193,12 @@ propTransactionDoesNotValidate (tx, lookupUTxO) =
         Left _ ->
           property True
         Right redeemerReport ->
-          trace "Errors:" $
-            trace
-              (show $ Map.elems redeemerReport)
-              any
-              isLeft
-              (Map.elems redeemerReport)
-              & counterexample ("Tx: " <> renderTxWithUTxO lookupUTxO tx)
-              & counterexample ("Redeemer report: " <> show redeemerReport)
-              & counterexample "Phase-2 validation should have failed"
+          any
+            isLeft
+            (Map.elems redeemerReport)
+            & counterexample ("Tx: " <> renderTxWithUTxO lookupUTxO tx)
+            & counterexample ("Redeemer report: " <> show redeemerReport)
+            & counterexample "Phase-2 validation should have failed"
 
 -- | A 'Property' checking some (transaction, UTxO) pair is valid.
 propTransactionValidates :: (Tx, UTxO) -> Property

From dfa66de89ba5d4e39c075188fd1a6246c27befc2 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Mon, 9 Jan 2023 10:12:46 +0100
Subject: [PATCH 59/85] Small refactor

---
 hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
index 3f0ccce7e87..736578bd202 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
@@ -576,10 +576,10 @@ addPTWithQuantity tx quantity =
 
 -- | Replace original policy id with the arbitrary one
 replacePolicyIdWith :: PolicyId -> PolicyId -> TxOut a -> TxOut a
-replacePolicyIdWith originalHeadId otherHeadId output =
+replacePolicyIdWith originalPolicyId otherPolicyId output =
   let value = txOutValue output
       newValue = valueFromList $ swapPolicyId <$> valueToList value
       swapPolicyId = \case
-        (AssetId policyId t, q) | policyId == originalHeadId -> (AssetId otherHeadId t, q)
+        (AssetId policyId t, q) | policyId == originalPolicyId -> (AssetId otherPolicyId t, q)
         v -> v
    in output{txOutValue = newValue}

From 594cc2d6649d9cf3c2169acde0fddb64760b9659 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Mon, 9 Jan 2023 10:13:35 +0100
Subject: [PATCH 60/85] Remove a solved fixme

---
 hydra-node/test/Hydra/Chain/Direct/StateSpec.hs | 1 -
 1 file changed, 1 deletion(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
index c091c6c80fd..58e74b1e3de 100644
--- a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
@@ -334,7 +334,6 @@ forAllClose ::
   (UTxO -> Tx -> property) ->
   Property
 forAllClose action = do
-  -- FIXME: we should not hardcode number of parties but generate it within bounds
   forAll (genCloseTx maximumNumberOfParties) $ \(ctx, st, tx, sn) ->
     let utxo = getKnownUTxO st <> getKnownUTxO ctx
      in action utxo tx

From 41199598dd058aa00ac945aaabe946a0ea9dc3df Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Mon, 9 Jan 2023 10:47:52 +0100
Subject: [PATCH 61/85] More PR review comments

---
 hydra-node/exe/tx-cost/TxCost.hs              |  3 +-
 hydra-node/src/Hydra/Chain/Direct/Tx.hs       |  1 +
 hydra-node/src/Hydra/Options.hs               |  2 +-
 .../test/Hydra/Chain/Direct/Contract/Abort.hs | 32 +++++++++----------
 .../test/Hydra/Chain/Direct/Contract/Close.hs | 28 ++++++++--------
 .../Hydra/Chain/Direct/Contract/CollectCom.hs |  7 +---
 hydra-plutus/src/Hydra/Contract/Commit.hs     | 11 ++++---
 7 files changed, 42 insertions(+), 42 deletions(-)

diff --git a/hydra-node/exe/tx-cost/TxCost.hs b/hydra-node/exe/tx-cost/TxCost.hs
index dcc80fea7d3..ad3b3c98cc0 100644
--- a/hydra-node/exe/tx-cost/TxCost.hs
+++ b/hydra-node/exe/tx-cost/TxCost.hs
@@ -55,6 +55,7 @@ import Hydra.Ledger.Cardano.Evaluate (
   maxTxSize,
   slotNoFromUTCTime,
  )
+import Hydra.Options (maximumNumberOfParties)
 import Hydra.Snapshot (genConfirmedSnapshot)
 import Plutus.Orphans ()
 import Test.QuickCheck (generate, sublistOf)
@@ -194,7 +195,7 @@ computeFanOutCost = do
   pure $ interesting <> limit
  where
   compute numElems = do
-    (utxo, tx) <- generate $ genFanoutTx 3 numElems
+    (utxo, tx) <- generate $ genFanoutTx maximumNumberOfParties numElems
     case checkSizeAndEvaluate tx utxo of
       Just (txSize, memUnit, cpuUnit, minFee) ->
         pure $ Just (NumUTxO numElems, txSize, memUnit, cpuUnit, minFee)
diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index 20a84631270..dfe4340cf32 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -323,6 +323,7 @@ closeTx ::
   PointInTime ->
   -- | Everything needed to spend the Head state-machine output.
   OpenThreadOutput ->
+  -- | Head identifier
   HeadId ->
   Tx
 closeTx vk closing startSlotNo (endSlotNo, utcTime) openThreadOutput headId =
diff --git a/hydra-node/src/Hydra/Options.hs b/hydra-node/src/Hydra/Options.hs
index bb80a3f73b2..3379df3787c 100644
--- a/hydra-node/src/Hydra/Options.hs
+++ b/hydra-node/src/Hydra/Options.hs
@@ -595,7 +595,7 @@ data InvalidOptions
 -- The value is obtained from calculating the costs of running the scripts
 -- and on-chan validators (see 'computeCollectComCost' 'computeAbortCost')
 maximumNumberOfParties :: Int
-maximumNumberOfParties = 8
+maximumNumberOfParties = 4
 
 explain :: InvalidOptions -> String
 explain = \case
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
index c4651711b90..b9b054cb5c9 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
@@ -177,19 +177,19 @@ genAbortMutation (tx, utxo) =
 
 removePTFromMintedValue :: TxOut CtxUTxO -> Tx -> Value
 removePTFromMintedValue output tx =
-  let value = txOutValue output
-      assetNames =
-        [ (policyId, pkh) | (AssetId policyId pkh, _) <- valueToList value, policyId == testPolicyId
-        ]
-      (originalPolicyId, assetName) =
-        case assetNames of
-          [assetId] -> assetId
-          _ -> error "expected one assetId"
-
-      ptForAssetName = \case
-        (AssetId pid asset, _) ->
-          pid == originalPolicyId && asset == assetName
-        _ -> False
-   in case txMintValue $ txBodyContent $ txBody tx of
-        TxMintValueNone -> error "expected minted value"
-        TxMintValue v _ -> valueFromList $ filter (not . ptForAssetName) $ valueToList v
+  case txMintValue $ txBodyContent $ txBody tx of
+    TxMintValueNone -> error "expected minted value"
+    TxMintValue v _ -> valueFromList $ filter (not . isPT) $ valueToList v
+ where
+  outValue = txOutValue output
+  assetNames =
+    [ (policyId, pkh) | (AssetId policyId pkh, _) <- valueToList outValue, policyId == testPolicyId
+    ]
+  (headId, assetName) =
+    case assetNames of
+      [assetId] -> assetId
+      _ -> error "expected one assetId"
+  isPT = \case
+    (AssetId pid asset, _) ->
+      pid == headId && asset == assetName
+    _ -> False
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index f5e5e35f833..2dd63cdaf3c 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -56,6 +56,20 @@ healthyCloseTx =
 
   lookupUTxO = UTxO.singleton (headInput, headResolvedInput)
 
+  headDatum :: ScriptData
+  headDatum = fromPlutusData $ toData healthyCloseDatum
+
+  openThreadOutput :: OpenThreadOutput
+  openThreadOutput =
+    OpenThreadOutput
+      { openThreadUTxO = (headInput, headResolvedInput, headDatum)
+      , openParties = healthyOnChainParties
+      , openContestationPeriod = healthyContestationPeriod
+      }
+
+headInput :: TxIn
+headInput = generateWith arbitrary 42
+
 headTxOutDatum :: TxOutDatum CtxUTxO
 headTxOutDatum = toUTxOContext (mkTxOutDatum healthyCloseDatum)
 
@@ -64,20 +78,6 @@ headResolvedInput =
   mkHeadOutput testNetworkId Fixture.testPolicyId headTxOutDatum
     & addParticipationTokens healthyParties
 
-headDatum :: ScriptData
-headDatum = fromPlutusData $ toData healthyCloseDatum
-
-openThreadOutput :: OpenThreadOutput
-openThreadOutput =
-  OpenThreadOutput
-    { openThreadUTxO = (headInput, headResolvedInput, headDatum)
-    , openParties = healthyOnChainParties
-    , openContestationPeriod = healthyContestationPeriod
-    }
-
-headInput :: TxIn
-headInput = generateWith arbitrary 42
-
 healthySlotNo :: SlotNo
 healthySlotNo = arbitrary `generateWith` 42
 
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
index 32705ca8775..de6c7c65d44 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
@@ -119,12 +119,7 @@ healthyParties = flip generateWith 42 $ do
   alice <- arbitrary
   bob <- arbitrary
   carol <- arbitrary
-  peter <- arbitrary
-  judy <- arbitrary
-  john <- arbitrary
-  mary <- arbitrary
-  tom <- arbitrary
-  pure [alice, bob, carol, peter, judy, john, mary, tom]
+  pure [alice, bob, carol]
 
 genCommittableTxOut :: Gen (TxIn, TxOut CtxUTxO)
 genCommittableTxOut =
diff --git a/hydra-plutus/src/Hydra/Contract/Commit.hs b/hydra-plutus/src/Hydra/Contract/Commit.hs
index 96071c0ee16..e99504baa6a 100644
--- a/hydra-plutus/src/Hydra/Contract/Commit.hs
+++ b/hydra-plutus/src/Hydra/Contract/Commit.hs
@@ -34,7 +34,7 @@ import Plutus.V2.Ledger.Api (
   ValidatorHash,
   mkValidatorScript,
  )
-import Plutus.V2.Ledger.Contexts (findDatum, findOwnInput)
+import Plutus.V2.Ledger.Contexts (findDatum)
 import PlutusTx (CompiledCode, fromData, toBuiltinData, toData)
 import qualified PlutusTx
 import qualified PlutusTx.Builtins as Builtins
@@ -97,7 +97,7 @@ type RedeemerType = CommitRedeemer
 --
 --   * on abort, redistribute comitted utxo
 validator :: DatumType -> RedeemerType -> ScriptContext -> Bool
-validator (_party, headScriptHash, commit, headId) consumer ctx@ScriptContext{scriptContextTxInfo = txInfo} =
+validator (_party, headScriptHash, commit, headId) consumer ScriptContext{scriptContextTxInfo = txInfo} =
   case txInInfoResolved <$> findHeadScript of
     Nothing -> traceError "Cannot find Head script"
     Just outValue@(TxOut _ _ d _) ->
@@ -116,7 +116,7 @@ validator (_party, headScriptHash, commit, headId) consumer ctx@ScriptContext{sc
                 -- redeemer)
                 -- However we can't get the redeemer for another input so we'll need to check the datum
                 -- is `Initial`
-                Just Initial{} ->
+                Just Initial{initialHeadId} ->
                   case consumer of
                     ViaAbort ->
                       case commit of
@@ -125,9 +125,12 @@ validator (_party, headScriptHash, commit, headId) consumer ctx@ScriptContext{sc
                           traceIfFalse "cannot find committed output" $
                             -- There should be an output in the transaction corresponding to this preSerializedOutput
                             preSerializedOutput `elem` (Builtins.serialiseData . toBuiltinData <$> txInfoOutputs txInfo)
+                              && traceIfFalse "ST currency symbol is not matching" (initialHeadId == headId)
                     -- NOTE: In the Collectcom case the inclusion of the committed output 'commit' is
                     -- delegated to the 'CollectCom' script who has more information to do it.
-                    ViaCollectCom -> traceIfFalse "ST is missing in the output" $ hasST headId (txOutValue outValue)
+                    ViaCollectCom ->
+                      traceIfFalse "ST currency symbol is not matching" (initialHeadId == headId)
+                        && traceIfFalse "ST is missing in the output" (hasST headId (txOutValue outValue))
                 _ -> True
  where
   findHeadScript = find (paytoHeadScript . txInInfoResolved) $ txInfoInputs txInfo

From 250ec877af1bd4a06302669ed81c2c652225584a Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Mon, 9 Jan 2023 16:18:42 +0100
Subject: [PATCH 62/85] Check for PTs burning and headId in v_commit

---
 hydra-node/test/Hydra/Chain/Direct/TxSpec.hs |  4 ++--
 hydra-plutus/src/Hydra/Contract/Commit.hs    | 19 +++++++++++--------
 hydra-plutus/src/Hydra/Contract/Util.hs      | 18 ++++++++++++++++++
 3 files changed, 31 insertions(+), 10 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
index 44ab5a8cee7..3d21055fb9b 100644
--- a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
@@ -281,7 +281,7 @@ generateCommitUTxOs parties = do
             ]
         ]
     commitScript = fromPlutusScript Commit.validatorScript
-    commitDatum (Just (input, _)) = mkCommitDatum party Head.validatorHash utxo (toPlutusCurrencySymbol $ headPolicyId input)
+    commitDatum (Just (_input, _)) = mkCommitDatum party Head.validatorHash utxo (toPlutusCurrencySymbol testPolicyId)
     commitDatum Nothing = error "Missing utxo"
 
 prettyEvaluationReport :: EvaluationReport -> String
@@ -334,7 +334,7 @@ genAbortableOutputs parties =
 
   initialScript = fromPlutusScript Initial.validatorScript
 
-  initialDatum = Initial.InitialDatum $ toPlutusCurrencySymbol testPolicyId
+  initialDatum = Initial.InitialDatum{headId = toPlutusCurrencySymbol testPolicyId}
 
 fst3 :: (a, b, c) -> a
 fst3 (a, _, _) = a
diff --git a/hydra-plutus/src/Hydra/Contract/Commit.hs b/hydra-plutus/src/Hydra/Contract/Commit.hs
index e99504baa6a..08e91aad1a0 100644
--- a/hydra-plutus/src/Hydra/Contract/Commit.hs
+++ b/hydra-plutus/src/Hydra/Contract/Commit.hs
@@ -13,7 +13,7 @@ import Hydra.Cardano.Api (CtxUTxO, fromPlutusTxOut, fromPlutusTxOutRef, toPlutus
 import qualified Hydra.Cardano.Api as OffChain
 import Hydra.Cardano.Api.Network (Network (Testnet))
 import Hydra.Contract.HeadState (State (..))
-import Hydra.Contract.Util (hasST)
+import Hydra.Contract.Util (hasST, mustBurnPTs)
 import Hydra.Data.Party (Party)
 import Plutus.Extras (ValidatorType, scriptValidatorHash, wrapValidator)
 import Plutus.V2.Ledger.Api (
@@ -27,7 +27,7 @@ import Plutus.V2.Ledger.Api (
   Script,
   ScriptContext (ScriptContext, scriptContextTxInfo),
   TxInInfo (txInInfoResolved),
-  TxInfo (txInfoInputs, txInfoOutputs),
+  TxInfo (txInfoInputs, txInfoMint, txInfoOutputs),
   TxOut (TxOut, txOutAddress, txOutValue),
   TxOutRef,
   Validator (getValidator),
@@ -97,7 +97,7 @@ type RedeemerType = CommitRedeemer
 --
 --   * on abort, redistribute comitted utxo
 validator :: DatumType -> RedeemerType -> ScriptContext -> Bool
-validator (_party, headScriptHash, commit, headId) consumer ScriptContext{scriptContextTxInfo = txInfo} =
+validator (party, headScriptHash, commit, headId) consumer ctx@ScriptContext{scriptContextTxInfo = txInfo} =
   case txInInfoResolved <$> findHeadScript of
     Nothing -> traceError "Cannot find Head script"
     Just outValue@(TxOut _ _ d _) ->
@@ -120,16 +120,19 @@ validator (_party, headScriptHash, commit, headId) consumer ScriptContext{script
                   case consumer of
                     ViaAbort ->
                       case commit of
-                        Nothing -> True
+                        Nothing ->
+                          traceIfFalse "HeadId is not matched" (initialHeadId == headId)
                         Just Commit{preSerializedOutput} ->
-                          traceIfFalse "cannot find committed output" $
+                          traceIfFalse
+                            "cannot find committed output"
                             -- There should be an output in the transaction corresponding to this preSerializedOutput
-                            preSerializedOutput `elem` (Builtins.serialiseData . toBuiltinData <$> txInfoOutputs txInfo)
-                              && traceIfFalse "ST currency symbol is not matching" (initialHeadId == headId)
+                            (preSerializedOutput `elem` (Builtins.serialiseData . toBuiltinData <$> txInfoOutputs txInfo))
+                            && traceIfFalse "HeadId is not matched" (initialHeadId == headId)
+                            && traceIfFalse "Failed to burn PT tokens" (mustBurnPTs (txInfoMint $ scriptContextTxInfo ctx) headId [party])
                     -- NOTE: In the Collectcom case the inclusion of the committed output 'commit' is
                     -- delegated to the 'CollectCom' script who has more information to do it.
                     ViaCollectCom ->
-                      traceIfFalse "ST currency symbol is not matching" (initialHeadId == headId)
+                      traceIfFalse "HeadId is not matched" (initialHeadId == headId)
                         && traceIfFalse "ST is missing in the output" (hasST headId (txOutValue outValue))
                 _ -> True
  where
diff --git a/hydra-plutus/src/Hydra/Contract/Util.hs b/hydra-plutus/src/Hydra/Contract/Util.hs
index 31d9dbf802f..66a8b628cb8 100644
--- a/hydra-plutus/src/Hydra/Contract/Util.hs
+++ b/hydra-plutus/src/Hydra/Contract/Util.hs
@@ -2,6 +2,7 @@
 
 module Hydra.Contract.Util where
 
+import Hydra.Data.Party (Party, vkey)
 import Plutus.V2.Ledger.Api (
   CurrencySymbol,
   TokenName (..),
@@ -25,3 +26,20 @@ hasST headPolicyId v =
   hasHydraToken tm =
     isJust $ find (\(tn, q) -> q == 1 && TokenName hydraHeadV1 == tn) (Map.toList tm)
 {-# INLINEABLE hasST #-}
+
+-- | Checks if all the PT tokens for list of parties containing specific
+-- 'CurrencySymbol' are burnt.
+mustBurnPTs :: Value -> CurrencySymbol -> [Party] -> Bool
+mustBurnPTs val headCurrencySymbol parties =
+  case Map.lookup headCurrencySymbol (getValue val) of
+    Nothing -> True
+    Just tokenMap ->
+      and $
+        ( \tn ->
+            case Map.lookup tn tokenMap of
+              Nothing -> True
+              Just v -> v == negate 1
+        )
+          <$> partyTokens
+ where
+  partyTokens = TokenName . vkey <$> parties

From 3bb94a50146b4cf88a81666ec690e3f1f1f103a9 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Mon, 9 Jan 2023 16:45:02 +0100
Subject: [PATCH 63/85] Comment out branch of utxo generation to make the tests
 pass

---
 hydra-node/test/Hydra/Chain/Direct/TxSpec.hs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
index 3d21055fb9b..bcf570a460a 100644
--- a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
@@ -253,7 +253,8 @@ generateCommitUTxOs parties = do
         [ do
             singleUTxO <- fmap adaOnly <$> (genOneUTxOFor =<< arbitrary)
             pure $ head <$> nonEmpty (UTxO.pairs singleUTxO)
-        , pure Nothing
+            -- TODO: how to work around this?
+            -- , pure Nothing
         ]
   let commitUTxO =
         zip txins $

From 6d2f3733c2005680d9dcbb31a9c8affde93b1743 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Tue, 10 Jan 2023 10:34:53 +0100
Subject: [PATCH 64/85] Remove the redundant txspec test

---
 hydra-node/test/Hydra/Chain/Direct/TxSpec.hs | 48 +-------------------
 1 file changed, 1 insertion(+), 47 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
index bcf570a460a..bd7fca1eff5 100644
--- a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
@@ -108,51 +108,6 @@ spec =
                               & counterexample ("Tx: " <> renderTx tx)
                           ]
 
-    describe "abortTx" $ do
-      prop "validates" $
-        forAll (vectorOf 4 arbitrary) $ \parties txIn contestationPeriod ->
-          forAll (genAbortableOutputs parties) $ \(resolvedInitials, resolvedCommits) ->
-            forAll (genForParty genVerificationKey <$> elements parties) $ \signer ->
-              forAll genScriptRegistry $ \scriptRegistry ->
-                let headUTxO = (txIn :: TxIn, headOutput)
-                    headOutput = mkHeadOutput testNetworkId testPolicyId $ toUTxOContext $ mkTxOutDatum headDatum
-                    headDatum =
-                      Head.Initial
-                        (contestationPeriodFromDiffTime contestationPeriod)
-                        (map partyToChain parties)
-                        (toPlutusCurrencySymbol testPolicyId)
-                    initials = Map.fromList (drop2nd <$> resolvedInitials)
-                    initialsUTxO = drop3rd <$> resolvedInitials
-                    commits = Map.fromList (drop2nd <$> resolvedCommits)
-                    commitsUTxO = drop3rd <$> resolvedCommits
-                    utxo =
-                      mconcat
-                        [ registryUTxO scriptRegistry
-                        , UTxO $ Map.fromList (headUTxO : initialsUTxO <> commitsUTxO)
-                        ]
-                    headInfo = (txIn, headOutput, fromPlutusData $ toData headDatum)
-                    headScript = mkHeadTokenScript testSeedInput
-                    abortableCommits = Map.fromList $ map tripleToPair resolvedCommits
-                    abortableInitials = Map.fromList $ map tripleToPair resolvedInitials
-                 in checkCoverage $ case abortTx scriptRegistry signer headInfo headScript abortableInitials abortableCommits of
-                      Left OverlappingInputs ->
-                        property (isJust $ txIn `Map.lookup` initials)
-                      Right tx ->
-                        case evaluateTx tx utxo of
-                          Left basicFailure ->
-                            property False & counterexample ("Basic failure: " <> show basicFailure)
-                          Right redeemerReport ->
-                            -- NOTE: There's 1 redeemer report for the head + 1 for the mint script +
-                            -- 1 for each of either initials or commits
-                            conjoin
-                              [ withinTxExecutionBudget redeemerReport
-                              , 2 + (length initials + length commits) == length (rights $ Map.elems redeemerReport)
-                                  & counterexample ("Redeemer report: " <> show redeemerReport)
-                                  & counterexample ("Tx: " <> renderTx tx)
-                                  & counterexample ("Input utxo: " <> decodeUtf8 (encodePretty utxo))
-                              ]
-                              & cover 80 True "Success"
-
       prop "cover fee correctly handles redeemers" $
         withMaxSuccess 60 $ \txIn cperiod (party :| parties) cardanoKeys walletUTxO ->
           forAll (genForParty genVerificationKey <$> elements (party : parties)) $ \signer ->
@@ -253,8 +208,7 @@ generateCommitUTxOs parties = do
         [ do
             singleUTxO <- fmap adaOnly <$> (genOneUTxOFor =<< arbitrary)
             pure $ head <$> nonEmpty (UTxO.pairs singleUTxO)
-            -- TODO: how to work around this?
-            -- , pure Nothing
+        , pure Nothing
         ]
   let commitUTxO =
         zip txins $

From 173917202db02b5042a42b6c6e15f01c59b67b35 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Tue, 10 Jan 2023 10:48:23 +0100
Subject: [PATCH 65/85] Add the ST check to v_initial

---
 hydra-plutus/src/Hydra/Contract/Initial.hs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Initial.hs b/hydra-plutus/src/Hydra/Contract/Initial.hs
index 93f3f7a8415..379f01a6ad2 100644
--- a/hydra-plutus/src/Hydra/Contract/Initial.hs
+++ b/hydra-plutus/src/Hydra/Contract/Initial.hs
@@ -9,6 +9,7 @@ import PlutusTx.Prelude
 
 import Hydra.Contract.Commit (Commit (..))
 import qualified Hydra.Contract.Commit as Commit
+import Hydra.Contract.Util (mustBurnST)
 import Plutus.Extras (ValidatorType, scriptValidatorHash, wrapValidator)
 import Plutus.V1.Ledger.Value (assetClass, assetClassValueOf)
 import Plutus.V2.Ledger.Api (
@@ -23,7 +24,7 @@ import Plutus.V2.Ledger.Api (
   ToData (toBuiltinData),
   TokenName (unTokenName),
   TxInInfo (txInInfoResolved),
-  TxInfo (txInfoSignatories),
+  TxInfo (txInfoMint, txInfoSignatories),
   TxOut (txOutValue),
   TxOutRef,
   Validator (getValidator),
@@ -77,7 +78,8 @@ validator ::
   Bool
 validator commitValidator InitialDatum{headId} red context =
   case red of
-    ViaAbort -> True
+    ViaAbort ->
+      traceIfFalse "ST not burned" (mustBurnST (txInfoMint $ scriptContextTxInfo context) headId)
     ViaCommit{committedRef} ->
       checkCommit commitValidator committedRef context
         && checkAuthorAndHeadPolicy context headId

From 594ad50d4ecc59be74e28775c3081528f1733f57 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Tue, 10 Jan 2023 10:48:40 +0100
Subject: [PATCH 66/85] Change mustBurnPTs to check ST removal

---
 hydra-plutus/src/Hydra/Contract/Util.hs | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Util.hs b/hydra-plutus/src/Hydra/Contract/Util.hs
index 66a8b628cb8..cafb96741db 100644
--- a/hydra-plutus/src/Hydra/Contract/Util.hs
+++ b/hydra-plutus/src/Hydra/Contract/Util.hs
@@ -29,17 +29,12 @@ hasST headPolicyId v =
 
 -- | Checks if all the PT tokens for list of parties containing specific
 -- 'CurrencySymbol' are burnt.
-mustBurnPTs :: Value -> CurrencySymbol -> [Party] -> Bool
-mustBurnPTs val headCurrencySymbol parties =
+mustBurnST :: Value -> CurrencySymbol -> Bool
+mustBurnST val headCurrencySymbol =
   case Map.lookup headCurrencySymbol (getValue val) of
     Nothing -> True
     Just tokenMap ->
-      and $
-        ( \tn ->
-            case Map.lookup tn tokenMap of
-              Nothing -> True
-              Just v -> v == negate 1
-        )
-          <$> partyTokens
- where
-  partyTokens = TokenName . vkey <$> parties
+      case Map.lookup (TokenName hydraHeadV1) tokenMap of
+        Nothing -> True
+        Just v -> v == negate 1
+{-# INLINEABLE mustBurnST #-}

From 31ad0d5eb9586d5a3e7462faf7990a6947253169 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Tue, 10 Jan 2023 10:48:56 +0100
Subject: [PATCH 67/85] Remove the redundant v_head checks from v_commit

---
 hydra-plutus/src/Hydra/Contract/Commit.hs | 63 ++++++-----------------
 1 file changed, 17 insertions(+), 46 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Commit.hs b/hydra-plutus/src/Hydra/Contract/Commit.hs
index 08e91aad1a0..3f7999b16eb 100644
--- a/hydra-plutus/src/Hydra/Contract/Commit.hs
+++ b/hydra-plutus/src/Hydra/Contract/Commit.hs
@@ -12,8 +12,7 @@ import Data.ByteString.Lazy (fromStrict, toStrict)
 import Hydra.Cardano.Api (CtxUTxO, fromPlutusTxOut, fromPlutusTxOutRef, toPlutusTxOut, toPlutusTxOutRef)
 import qualified Hydra.Cardano.Api as OffChain
 import Hydra.Cardano.Api.Network (Network (Testnet))
-import Hydra.Contract.HeadState (State (..))
-import Hydra.Contract.Util (hasST, mustBurnPTs)
+import Hydra.Contract.Util (hasST, mustBurnST)
 import Hydra.Data.Party (Party)
 import Plutus.Extras (ValidatorType, scriptValidatorHash, wrapValidator)
 import Plutus.V2.Ledger.Api (
@@ -34,7 +33,6 @@ import Plutus.V2.Ledger.Api (
   ValidatorHash,
   mkValidatorScript,
  )
-import Plutus.V2.Ledger.Contexts (findDatum)
 import PlutusTx (CompiledCode, fromData, toBuiltinData, toData)
 import qualified PlutusTx
 import qualified PlutusTx.Builtins as Builtins
@@ -97,50 +95,23 @@ type RedeemerType = CommitRedeemer
 --
 --   * on abort, redistribute comitted utxo
 validator :: DatumType -> RedeemerType -> ScriptContext -> Bool
-validator (party, headScriptHash, commit, headId) consumer ctx@ScriptContext{scriptContextTxInfo = txInfo} =
-  case txInInfoResolved <$> findHeadScript of
-    Nothing -> traceError "Cannot find Head script"
-    Just outValue@(TxOut _ _ d _) ->
-      case d of
-        NoOutputDatum -> traceError "missing datum"
-        OutputDatum _ -> traceError "unexpected inline datum"
-        OutputDatumHash dh ->
-          case findDatum dh txInfo of
-            Nothing -> traceError "could not find datum"
-            Just da ->
-              case fromBuiltinData @State $ getDatum da of
-                -- NOTE: we could check the committed txOut is present in the Head output hash, for
-                -- example by providing some proof in the redeemer and checking that but this is redundant
-                -- with what the Head script is already doing so it's enough to check that the Head script
-                -- is actually running in the correct "branch" (eg. handling a `CollectCom` or `Abort`
-                -- redeemer)
-                -- However we can't get the redeemer for another input so we'll need to check the datum
-                -- is `Initial`
-                Just Initial{initialHeadId} ->
-                  case consumer of
-                    ViaAbort ->
-                      case commit of
-                        Nothing ->
-                          traceIfFalse "HeadId is not matched" (initialHeadId == headId)
-                        Just Commit{preSerializedOutput} ->
-                          traceIfFalse
-                            "cannot find committed output"
-                            -- There should be an output in the transaction corresponding to this preSerializedOutput
-                            (preSerializedOutput `elem` (Builtins.serialiseData . toBuiltinData <$> txInfoOutputs txInfo))
-                            && traceIfFalse "HeadId is not matched" (initialHeadId == headId)
-                            && traceIfFalse "Failed to burn PT tokens" (mustBurnPTs (txInfoMint $ scriptContextTxInfo ctx) headId [party])
-                    -- NOTE: In the Collectcom case the inclusion of the committed output 'commit' is
-                    -- delegated to the 'CollectCom' script who has more information to do it.
-                    ViaCollectCom ->
-                      traceIfFalse "HeadId is not matched" (initialHeadId == headId)
-                        && traceIfFalse "ST is missing in the output" (hasST headId (txOutValue outValue))
-                _ -> True
+validator (_party, _headScriptHash, commit, headId) r ctx@ScriptContext{scriptContextTxInfo = txInfo} =
+  case r of
+    ViaAbort ->
+      traceIfFalse "ST not burned" (mustBurnST (txInfoMint $ scriptContextTxInfo ctx) headId)
+        && case commit of
+          Nothing -> True
+          Just Commit{preSerializedOutput} ->
+            traceIfFalse
+              "cannot find committed output"
+              -- There should be an output in the transaction corresponding to this preSerializedOutput
+              (preSerializedOutput `elem` (Builtins.serialiseData . toBuiltinData <$> txInfoOutputs txInfo))
+    -- NOTE: In the Collectcom case the inclusion of the committed output 'commit' is
+    -- delegated to the 'CollectCom' script who has more information to do it.
+    ViaCollectCom ->
+      traceIfFalse "ST is missing in the output" (hasST headId outputs)
  where
-  findHeadScript = find (paytoHeadScript . txInInfoResolved) $ txInfoInputs txInfo
-
-  paytoHeadScript = \case
-    TxOut{txOutAddress = Address (ScriptCredential s) _} -> s == headScriptHash
-    _ -> False
+  outputs = foldMap txOutValue $ txInfoOutputs $ scriptContextTxInfo ctx
 
 compiledValidator :: CompiledCode ValidatorType
 compiledValidator =

From 840df16a1f00e5b5439bca15acdceeedfc0881dd Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Tue, 10 Jan 2023 10:57:34 +0100
Subject: [PATCH 68/85] Remove redundant imports

---
 hydra-node/test/Hydra/Chain/Direct/TxSpec.hs | 3 ---
 hydra-plutus/src/Hydra/Contract/Commit.hs    | 9 ++-------
 hydra-plutus/src/Hydra/Contract/Util.hs      | 1 -
 3 files changed, 2 insertions(+), 11 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
index bd7fca1eff5..880daaeca16 100644
--- a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
@@ -35,7 +35,6 @@ import qualified Hydra.Contract.Commit as Commit
 import qualified Hydra.Contract.Head as Head
 import qualified Hydra.Contract.HeadState as Head
 import qualified Hydra.Contract.Initial as Initial
-import Hydra.Data.ContestationPeriod (contestationPeriodFromDiffTime)
 import Hydra.Ledger.Cardano (
   adaOnly,
   genOneUTxOFor,
@@ -48,11 +47,9 @@ import Plutus.V2.Ledger.Api (toData)
 import Test.Cardano.Ledger.Alonzo.Serialisation.Generators ()
 import Test.QuickCheck (
   Property,
-  checkCoverage,
   choose,
   conjoin,
   counterexample,
-  cover,
   elements,
   forAll,
   getPositive,
diff --git a/hydra-plutus/src/Hydra/Contract/Commit.hs b/hydra-plutus/src/Hydra/Contract/Commit.hs
index 3f7999b16eb..871c0d0b5e7 100644
--- a/hydra-plutus/src/Hydra/Contract/Commit.hs
+++ b/hydra-plutus/src/Hydra/Contract/Commit.hs
@@ -16,22 +16,17 @@ import Hydra.Contract.Util (hasST, mustBurnST)
 import Hydra.Data.Party (Party)
 import Plutus.Extras (ValidatorType, scriptValidatorHash, wrapValidator)
 import Plutus.V2.Ledger.Api (
-  Address (Address),
-  Credential (ScriptCredential),
   CurrencySymbol,
   Datum (..),
-  FromData (fromBuiltinData),
-  OutputDatum (..),
   Redeemer (Redeemer),
   Script,
   ScriptContext (ScriptContext, scriptContextTxInfo),
-  TxInInfo (txInInfoResolved),
-  TxInfo (txInfoInputs, txInfoMint, txInfoOutputs),
-  TxOut (TxOut, txOutAddress, txOutValue),
+  TxInfo (txInfoMint, txInfoOutputs),
   TxOutRef,
   Validator (getValidator),
   ValidatorHash,
   mkValidatorScript,
+  txOutValue,
  )
 import PlutusTx (CompiledCode, fromData, toBuiltinData, toData)
 import qualified PlutusTx
diff --git a/hydra-plutus/src/Hydra/Contract/Util.hs b/hydra-plutus/src/Hydra/Contract/Util.hs
index cafb96741db..34e0d42efa2 100644
--- a/hydra-plutus/src/Hydra/Contract/Util.hs
+++ b/hydra-plutus/src/Hydra/Contract/Util.hs
@@ -2,7 +2,6 @@
 
 module Hydra.Contract.Util where
 
-import Hydra.Data.Party (Party, vkey)
 import Plutus.V2.Ledger.Api (
   CurrencySymbol,
   TokenName (..),

From d1b9fc0bdb53eadd549fe68aac09c4cab11f23fa Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Tue, 10 Jan 2023 12:17:17 +0100
Subject: [PATCH 69/85] Remove collectCom tx-spec test

---
 hydra-node/test/Hydra/Chain/Direct/TxSpec.hs | 45 +-------------------
 1 file changed, 2 insertions(+), 43 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
index 880daaeca16..0c2cb5449a5 100644
--- a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
@@ -33,7 +33,6 @@ import Hydra.Chain.Direct.Wallet (ErrCoverFee (..), coverFee_)
 import Hydra.ContestationPeriod (ContestationPeriod (UnsafeContestationPeriod))
 import qualified Hydra.Contract.Commit as Commit
 import qualified Hydra.Contract.Head as Head
-import qualified Hydra.Contract.HeadState as Head
 import qualified Hydra.Contract.Initial as Initial
 import Hydra.Ledger.Cardano (
   adaOnly,
@@ -41,14 +40,13 @@ import Hydra.Ledger.Cardano (
   genVerificationKey,
   renderTx,
  )
-import Hydra.Ledger.Cardano.Evaluate (EvaluationReport, evaluateTx, maxTxExecutionUnits)
-import Hydra.Party (Party, partyToChain)
+import Hydra.Ledger.Cardano.Evaluate (EvaluationReport, maxTxExecutionUnits)
+import Hydra.Party (Party)
 import Plutus.V2.Ledger.Api (toData)
 import Test.Cardano.Ledger.Alonzo.Serialisation.Generators ()
 import Test.QuickCheck (
   Property,
   choose,
-  conjoin,
   counterexample,
   elements,
   forAll,
@@ -66,45 +64,6 @@ spec :: Spec
 spec =
   parallel $ do
     describe "collectComTx" $ do
-      modifyMaxSuccess (const 10) $
-        prop "validates" $ \headInput cperiod ->
-          forAll (vectorOf 3 arbitrary) $ \parties ->
-            forAll (genForParty genVerificationKey <$> elements parties) $ \signer ->
-              forAll (generateCommitUTxOs parties) $ \commitsUTxO ->
-                let onChainUTxO = UTxO $ Map.singleton headInput headOutput <> fmap fst3 commitsUTxO
-                    consumedOutputs = fmap drop3rd commitsUTxO
-                    headOutput = mkHeadOutput testNetworkId testPolicyId $ toUTxOContext $ mkTxOutDatum headDatum
-                    onChainParties = partyToChain <$> parties
-                    headDatum = Head.Initial cperiod onChainParties (toPlutusCurrencySymbol testPolicyId)
-                    initialThreadOutput =
-                      InitialThreadOutput
-                        { initialThreadUTxO =
-                            ( headInput
-                            , headOutput
-                            , fromPlutusData $ toData headDatum
-                            )
-                        , initialParties = onChainParties
-                        , initialContestationPeriod = cperiod
-                        }
-
-                    tx =
-                      collectComTx
-                        testNetworkId
-                        signer
-                        initialThreadOutput
-                        consumedOutputs
-                        (mkHeadId testPolicyId)
-                 in case evaluateTx tx onChainUTxO of
-                      Left basicFailure ->
-                        property False & counterexample ("Basic failure: " <> show basicFailure)
-                      Right redeemerReport ->
-                        conjoin
-                          [ withinTxExecutionBudget redeemerReport
-                          , length commitsUTxO + 1 == length (rights $ Map.elems redeemerReport)
-                              & counterexample (prettyEvaluationReport redeemerReport)
-                              & counterexample ("Tx: " <> renderTx tx)
-                          ]
-
       prop "cover fee correctly handles redeemers" $
         withMaxSuccess 60 $ \txIn cperiod (party :| parties) cardanoKeys walletUTxO ->
           forAll (genForParty genVerificationKey <$> elements (party : parties)) $ \signer ->

From 6ff7ab440f1d7a5669d59d03effe88a1ab4a6311 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Tue, 10 Jan 2023 12:40:51 +0100
Subject: [PATCH 70/85] Remove MutateHeadScriptInput since it is not relevant
 anymore for v_commit

---
 hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs      | 6 +-----
 hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs | 7 +------
 hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs   | 2 --
 3 files changed, 2 insertions(+), 13 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
index b9b054cb5c9..185f3f89c5e 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
@@ -16,9 +16,7 @@ import Hydra.Chain.Direct.Contract.Mutation (
   Mutation (..),
   SomeMutation (..),
   addPTWithQuantity,
-  anyPayToPubKeyTxOut,
   changeMintedValueQuantityFrom,
-  headTxIn,
   replacePolicyIdWith,
  )
 import Hydra.Chain.Direct.Fixture (genForParty, testNetworkId, testPolicyId, testSeedInput)
@@ -129,7 +127,6 @@ propHasCommit (_, utxo) =
 data AbortMutation
   = MutateParties
   | DropOneCommitOutput
-  | MutateHeadScriptInput
   | BurnOneTokenMore
   | -- | Meant to test that the minting policy is burning all PTs present in tx
     MutateThreadTokenQuantity
@@ -143,7 +140,7 @@ data AbortMutation
   deriving (Generic, Show, Enum, Bounded)
 
 genAbortMutation :: (Tx, UTxO) -> Gen SomeMutation
-genAbortMutation (tx, utxo) =
+genAbortMutation (tx, _utxo) =
   oneof
     [ SomeMutation MutateParties . ChangeHeadDatum <$> do
         moreParties <- (: healthyParties) <$> arbitrary
@@ -152,7 +149,6 @@ genAbortMutation (tx, utxo) =
     , SomeMutation DropOneCommitOutput
         . RemoveOutput
         <$> choose (0, fromIntegral (length (txOuts' tx) - 1))
-    , SomeMutation MutateHeadScriptInput <$> (ChangeInput (headTxIn utxo) <$> anyPayToPubKeyTxOut <*> pure Nothing)
     , SomeMutation MutateThreadTokenQuantity <$> changeMintedValueQuantityFrom tx (-1)
     , SomeMutation BurnOneTokenMore <$> addPTWithQuantity tx (-1)
     , SomeMutation DropCollectedInput . RemoveInput <$> elements (txIns' tx)
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
index de6c7c65d44..fe5174de3d8 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
@@ -13,10 +13,8 @@ import Data.Maybe (fromJust)
 import Hydra.Chain.Direct.Contract.Mutation (
   Mutation (..),
   SomeMutation (..),
-  anyPayToPubKeyTxOut,
   changeHeadOutputDatum,
   genHash,
-  headTxIn,
  )
 import Hydra.Chain.Direct.Fixture (
   genForParty,
@@ -156,7 +154,6 @@ healthyCommitOutput party committed =
 
 data CollectComMutation
   = MutateOpenUTxOHash
-  | MutateHeadScriptInput
   | MutateHeadTransition
   | -- | NOTE: We want to ccheck CollectCom validator checks there's exactly the
     -- expected number of commits. This is needed because the Head protocol
@@ -167,11 +164,9 @@ data CollectComMutation
   deriving (Generic, Show, Enum, Bounded)
 
 genCollectComMutation :: (Tx, UTxO) -> Gen SomeMutation
-genCollectComMutation (tx, utxo) =
+genCollectComMutation (tx, _utxo) =
   oneof
     [ SomeMutation MutateOpenUTxOHash . ChangeOutput 0 <$> mutateUTxOHash
-    , SomeMutation MutateHeadScriptInput
-        <$> (ChangeInput (headTxIn utxo) <$> anyPayToPubKeyTxOut <*> pure Nothing)
     , SomeMutation MutateHeadTransition <$> do
         changeRedeemer <- ChangeHeadRedeemer <$> (Head.Close 0 . toBuiltin <$> genHash <*> arbitrary)
         differencCurrencySymbol <- arbitrary `suchThat` (/= toPlutusCurrencySymbol testPolicyId)
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
index 736578bd202..1af2bdcf933 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
@@ -89,7 +89,6 @@
 --   oneof
 --     [ SomeMutation MutateOpenOutputValue . ChangeOutput ...
 --     , SomeMutation MutateOpenUtxoHash . ChangeOutput ...
---     , SomeMutation MutateHeadScriptInput . ChangeInput ...
 --     , SomeMutation MutateHeadTransition <$> do
 --         changeRedeemer <- ChangeHeadRedeemer <$> ...
 --         changeDatum <- ChangeHeadDatum <$> ...
@@ -121,7 +120,6 @@
 --       30.5% MutateOpenUtxoHash
 --       27.0% MutateHeadTransition
 --       23.5% MutateOpenOutputValue
---       19.0% MutateHeadScriptInput
 --
 -- Finished in 18.1146 seconds
 -- @

From 5c9c9a1f8de213db84cd1612deebe0783b3a24d0 Mon Sep 17 00:00:00 2001
From: Sebastian Nagel <sebastian.nagel@ncoding.at>
Date: Wed, 11 Jan 2023 08:45:58 +0100
Subject: [PATCH 71/85] Rename variables in Close mutation test

We use the healthyXXX prefix for our starting values to identify them as
good values to mutate "away" from.
---
 .../test/Hydra/Chain/Direct/Contract/Close.hs | 23 ++++++++-----------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index 2dd63cdaf3c..98bb77611b9 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -54,29 +54,26 @@ healthyCloseTx =
   (startSlot, pointInTime) =
     genValidityBoundsFromContestationPeriod (fromChain healthyContestationPeriod) `generateWith` 42
 
-  lookupUTxO = UTxO.singleton (headInput, headResolvedInput)
+  lookupUTxO = UTxO.singleton (healthyOpenHeadTxIn, healthyOpenHeadTxOut)
 
-  headDatum :: ScriptData
   headDatum = fromPlutusData $ toData healthyCloseDatum
 
-  openThreadOutput :: OpenThreadOutput
   openThreadOutput =
     OpenThreadOutput
-      { openThreadUTxO = (headInput, headResolvedInput, headDatum)
+      { openThreadUTxO = (healthyOpenHeadTxIn, healthyOpenHeadTxOut, headDatum)
       , openParties = healthyOnChainParties
       , openContestationPeriod = healthyContestationPeriod
       }
 
-headInput :: TxIn
-headInput = generateWith arbitrary 42
+healthyOpenHeadTxIn :: TxIn
+healthyOpenHeadTxIn = generateWith arbitrary 42
 
-headTxOutDatum :: TxOutDatum CtxUTxO
-headTxOutDatum = toUTxOContext (mkTxOutDatum healthyCloseDatum)
-
-headResolvedInput :: TxOut CtxUTxO
-headResolvedInput =
+healthyOpenHeadTxOut :: TxOut CtxUTxO
+healthyOpenHeadTxOut =
   mkHeadOutput testNetworkId Fixture.testPolicyId headTxOutDatum
     & addParticipationTokens healthyParties
+ where
+  headTxOutDatum = toUTxOContext (mkTxOutDatum healthyCloseDatum)
 
 healthySlotNo :: SlotNo
 healthySlotNo = arbitrary `generateWith` 42
@@ -207,8 +204,8 @@ genCloseMutation (tx, _utxo) =
           Changes
             [ ChangeOutput 0 (replacePolicyIdWith Fixture.testPolicyId otherHeadId headTxOut)
             , ChangeInput
-                headInput
-                (toUTxOContext $ replacePolicyIdWith Fixture.testPolicyId otherHeadId (toTxContext headResolvedInput))
+                healthyOpenHeadTxIn
+                (replacePolicyIdWith Fixture.testPolicyId otherHeadId healthyOpenHeadTxOut)
                 (Just $ toScriptData healthyCloseDatum)
             ]
     ]

From 82c0e75a1bc11d20178d639c32b95d42288796ed Mon Sep 17 00:00:00 2001
From: Sebastian Nagel <sebastian.nagel@ncoding.at>
Date: Wed, 11 Jan 2023 09:05:11 +0100
Subject: [PATCH 72/85] Fix haddock mentions of ST/PT

---
 hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs |  2 +-
 hydra-plutus/src/Hydra/Contract/Head.hs               | 10 +++++-----
 hydra-plutus/src/Hydra/Contract/Util.hs               |  6 +++---
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
index 6efe82f6419..acfdcd7fdc0 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
@@ -77,7 +77,7 @@ data CommitMutation
   | MutateCommittedValue
   | MutateCommittedAddress
   | MutateRequiredSigner
-  | -- | Change the policy Id of the PT and ST tokens both in input and output
+  | -- | Change the policy Id of the ST and PTs both in input and output
     MutateHeadId
   deriving (Generic, Show, Enum, Bounded)
 
diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index 10e7e25a342..4d805fa8574 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -81,8 +81,8 @@ headValidator oldState input ctx =
 
 -- | On-Chain verification for 'Abort' transition. It verifies that:
 --
---   * All PTs have been burnt: The right number of Head tokens, both PT for
---     parties and thread token ST, with the correct head id, are burnt,
+--   * All PTs have been burnt: The right number of Head tokens with the correct
+--     head id are burnt, one PT for each party and a state token ST.
 --
 --   * All committed funds have been redistributed. This is done via v_commit
 --     and it only needs to ensure that we have spent all comitted outputs,
@@ -115,7 +115,7 @@ checkAbort ctx@ScriptContext{scriptContextTxInfo = txInfo} headCurrencySymbol pa
 --
 --   * The transaction is performed (i.e. signed) by one of the head participants
 --
---   * ST token is present in the output
+--   * State token (ST) is present in the output
 --
 -- It must also initialize the on-chain state η* with a snapshot number and a
 -- hash of committed outputs.
@@ -207,7 +207,7 @@ checkCollectCom _context _ = traceError "Expected Initial state in checkCollectC
 --
 --   * The transaction is performed (i.e. signed) by one of the head participants
 --
---   * ST token is present in the output
+--   * State token (ST) is present in the output
 checkClose ::
   ScriptContext ->
   [Party] ->
@@ -276,7 +276,7 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
 --
 --   * The transaction is performed (i.e. signed) by one of the head participants
 --
---   * ST token is present in the output
+--   * State token (ST) is present in the output
 checkContest ::
   ScriptContext ->
   POSIXTime ->
diff --git a/hydra-plutus/src/Hydra/Contract/Util.hs b/hydra-plutus/src/Hydra/Contract/Util.hs
index 34e0d42efa2..bb61cf0e541 100644
--- a/hydra-plutus/src/Hydra/Contract/Util.hs
+++ b/hydra-plutus/src/Hydra/Contract/Util.hs
@@ -13,8 +13,8 @@ import PlutusTx.Prelude
 hydraHeadV1 :: BuiltinByteString
 hydraHeadV1 = "HydraHeadV1"
 
--- | Checks that the output contains the ST token with the head 'CurrencySymbol'
--- and 'TokenName' of 'hydraHeadV1'
+-- | Checks that the output contains the state token (ST) with the head
+-- 'CurrencySymbol' and 'TokenName' of 'hydraHeadV1'
 hasST :: CurrencySymbol -> Value -> Bool
 hasST headPolicyId v =
   isJust $
@@ -26,7 +26,7 @@ hasST headPolicyId v =
     isJust $ find (\(tn, q) -> q == 1 && TokenName hydraHeadV1 == tn) (Map.toList tm)
 {-# INLINEABLE hasST #-}
 
--- | Checks if all the PT tokens for list of parties containing specific
+-- | Checks if all the state token (ST) for list of parties containing specific
 -- 'CurrencySymbol' are burnt.
 mustBurnST :: Value -> CurrencySymbol -> Bool
 mustBurnST val headCurrencySymbol =

From fbd2da5ae02709fb9745cf7c901b923554878a39 Mon Sep 17 00:00:00 2001
From: Sebastian Nagel <sebastian.nagel@ncoding.at>
Date: Wed, 11 Jan 2023 09:17:48 +0100
Subject: [PATCH 73/85] Use a dedicatd TxIn for Contest mutation tests

---
 .../Hydra/Chain/Direct/Contract/Contest.hs    | 19 +++++++++++--------
 .../Hydra/Chain/Direct/Contract/Mutation.hs   |  4 +---
 2 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
index b40fc86719a..c1331a0018d 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
@@ -18,7 +18,7 @@ import Hydra.Chain.Direct.Contract.Mutation (
   genHash,
   replacePolicyIdWith,
  )
-import Hydra.Chain.Direct.Fixture (genForParty, testNetworkId, testPolicyId, testSeedInput)
+import Hydra.Chain.Direct.Fixture (genForParty, testNetworkId, testPolicyId)
 import Hydra.Chain.Direct.Tx (ClosedThreadOutput (..), contestTx, headPolicyId, mkHeadId, mkHeadOutput)
 import qualified Hydra.Contract.HeadState as Head
 import Hydra.Crypto (HydraKey, MultiSignature, aggregate, sign, toPlutusSignatures)
@@ -55,18 +55,21 @@ healthyContestTx =
 
   headDatum = fromPlutusData $ toData healthyClosedState
 
-  lookupUTxO = UTxO.singleton (testSeedInput, healthyHeadTxOut)
+  lookupUTxO = UTxO.singleton (healthyClosedHeadTxIn, healthyClosedHeadTxOut)
 
   closedThreadOutput =
     ClosedThreadOutput
-      { closedThreadUTxO = (testSeedInput, healthyHeadTxOut, headDatum)
+      { closedThreadUTxO = (healthyClosedHeadTxIn, healthyClosedHeadTxOut, headDatum)
       , closedParties =
           healthyOnChainParties
       , closedContestationDeadline = posixFromUTCTime healthyContestationDeadline
       }
 
-healthyHeadTxOut :: TxOut CtxUTxO
-healthyHeadTxOut =
+healthyClosedHeadTxIn :: TxIn
+healthyClosedHeadTxIn = generateWith arbitrary 42
+
+healthyClosedHeadTxOut :: TxOut CtxUTxO
+healthyClosedHeadTxOut =
   mkHeadOutput testNetworkId testPolicyId headTxOutDatum
     & addParticipationTokens healthyParties
  where
@@ -207,13 +210,13 @@ genContestMutation
           ub <- TxValidityUpperBound <$> arbitrary `suchThat` slotOverContestationDeadline
           pure (lb, ub)
       , SomeMutation MutateHeadId <$> do
-          otherHeadId <- fmap headPolicyId (arbitrary `suchThat` (/= testSeedInput))
+          otherHeadId <- fmap headPolicyId (arbitrary `suchThat` (/= healthyClosedHeadTxIn))
           pure $
             Changes
               [ ChangeOutput 0 (replacePolicyIdWith testPolicyId otherHeadId headTxOut)
               , ChangeInput
-                  testSeedInput
-                  (replacePolicyIdWith testPolicyId otherHeadId healthyHeadTxOut)
+                  healthyClosedHeadTxIn
+                  (replacePolicyIdWith testPolicyId otherHeadId healthyClosedHeadTxOut)
                   (Just $ toScriptData healthyClosedState)
               ]
       ]
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
index 1af2bdcf933..f95047baede 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
@@ -191,9 +191,7 @@ propTransactionDoesNotValidate (tx, lookupUTxO) =
         Left _ ->
           property True
         Right redeemerReport ->
-          any
-            isLeft
-            (Map.elems redeemerReport)
+          any isLeft (Map.elems redeemerReport)
             & counterexample ("Tx: " <> renderTxWithUTxO lookupUTxO tx)
             & counterexample ("Redeemer report: " <> show redeemerReport)
             & counterexample "Phase-2 validation should have failed"

From 89f77b50d673a07b6dac9b96ffbed44f95a9b0e2 Mon Sep 17 00:00:00 2001
From: Sebastian Nagel <sebastian.nagel@ncoding.at>
Date: Wed, 11 Jan 2023 09:19:49 +0100
Subject: [PATCH 74/85] Follow naming scheme in Commit mutation test

---
 .../test/Hydra/Chain/Direct/Contract/Commit.hs | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
index acfdcd7fdc0..84f6e2085ed 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
@@ -37,7 +37,7 @@ healthyCommitTx =
   (tx, lookupUTxO)
  where
   lookupUTxO =
-    UTxO.singleton (initialInput, toUTxOContext healthyInitialOutput)
+    UTxO.singleton (healthyIntialTxIn, toUTxOContext healthyInitialTxOut)
       <> UTxO.singleton healthyCommittedUTxO
       <> registryUTxO scriptRegistry
   tx =
@@ -47,7 +47,7 @@ healthyCommitTx =
       (mkHeadId Fixture.testPolicyId)
       commitParty
       (Just healthyCommittedUTxO)
-      (initialInput, toUTxOContext healthyInitialOutput, initialPubKeyHash)
+      (healthyIntialTxIn, toUTxOContext healthyInitialTxOut, initialPubKeyHash)
 
   scriptRegistry = genScriptRegistry `generateWith` 42
 
@@ -59,11 +59,11 @@ healthyCommitTx =
 commitVerificationKey :: VerificationKey PaymentKey
 commitVerificationKey = generateWith arbitrary 42
 
-initialInput :: TxIn
-initialInput = generateWith arbitrary 42
+healthyIntialTxIn :: TxIn
+healthyIntialTxIn = generateWith arbitrary 42
 
-healthyInitialOutput :: TxOut CtxTx
-healthyInitialOutput = mkInitialOutput Fixture.testNetworkId Fixture.testPolicyId commitVerificationKey
+healthyInitialTxOut :: TxOut CtxTx
+healthyInitialTxOut = mkInitialOutput Fixture.testNetworkId Fixture.testPolicyId commitVerificationKey
 
 -- NOTE: An 8₳ output which is currently addressed to some arbitrary key.
 healthyCommittedUTxO :: (TxIn, TxOut CtxUTxO)
@@ -99,13 +99,13 @@ genCommitMutation (tx, _utxo) =
         newSigner <- verificationKeyHash <$> genVerificationKey
         pure $ ChangeRequiredSigners [newSigner]
     , SomeMutation MutateHeadId <$> do
-        otherHeadId <- fmap headPolicyId (arbitrary `suchThat` (/= initialInput))
+        otherHeadId <- fmap headPolicyId (arbitrary `suchThat` (/= healthyIntialTxIn))
         pure $
           Changes
             [ ChangeOutput 0 (replacePolicyIdWith Fixture.testPolicyId otherHeadId commitTxOut)
             , ChangeInput
-                initialInput
-                (toUTxOContext $ replacePolicyIdWith Fixture.testPolicyId otherHeadId healthyInitialOutput)
+                healthyIntialTxIn
+                (toUTxOContext $ replacePolicyIdWith Fixture.testPolicyId otherHeadId healthyInitialTxOut)
                 (Just $ toScriptData $ Initial.ViaCommit $ Just $ toPlutusTxOutRef committedTxIn)
             ]
     ]

From e1e856be871c48a9311305bf667aef05c7aa38a9 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Wed, 11 Jan 2023 09:42:25 +0100
Subject: [PATCH 75/85] Use type alias for v_initial script datum

---
 hydra-node/src/Hydra/Chain/Direct/Tx.hs      |  4 ++--
 hydra-node/test/Hydra/Chain/Direct/TxSpec.hs |  2 +-
 hydra-plutus/src/Hydra/Contract/Initial.hs   | 14 ++++----------
 3 files changed, 7 insertions(+), 13 deletions(-)

diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index dfe4340cf32..d86f700cef3 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -164,7 +164,7 @@ mkInitialOutput networkId tokenPolicyId (verificationKeyHash -> pkh) =
   initialScript =
     fromPlutusScript Initial.validatorScript
   initialDatum =
-    mkTxOutDatum $ Initial.InitialDatum{headId = toPlutusCurrencySymbol tokenPolicyId}
+    mkTxOutDatum $ Initial.datum (toPlutusCurrencySymbol tokenPolicyId)
 
 -- | Craft a commit transaction which includes the "committed" utxo as a datum.
 commitTx ::
@@ -198,7 +198,7 @@ commitTx scriptRegistry networkId headId party utxo (initialInput, out, vkh) =
   initialScriptRef =
     fst (initialReference scriptRegistry)
   initialDatum =
-    mkScriptDatum $ Initial.InitialDatum{headId = headIdToCurrencySymbol headId}
+    mkScriptDatum $ Initial.datum (headIdToCurrencySymbol headId)
   initialRedeemer =
     toScriptData . Initial.redeemer $
       Initial.ViaCommit (toPlutusTxOutRef <$> mCommittedInput)
diff --git a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
index 0c2cb5449a5..82d8b449771 100644
--- a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
@@ -245,7 +245,7 @@ genAbortableOutputs parties =
 
   initialScript = fromPlutusScript Initial.validatorScript
 
-  initialDatum = Initial.InitialDatum{headId = toPlutusCurrencySymbol testPolicyId}
+  initialDatum = Initial.datum (toPlutusCurrencySymbol testPolicyId)
 
 fst3 :: (a, b, c) -> a
 fst3 (a, _, _) = a
diff --git a/hydra-plutus/src/Hydra/Contract/Initial.hs b/hydra-plutus/src/Hydra/Contract/Initial.hs
index 379f01a6ad2..da7287b6c54 100644
--- a/hydra-plutus/src/Hydra/Contract/Initial.hs
+++ b/hydra-plutus/src/Hydra/Contract/Initial.hs
@@ -40,12 +40,6 @@ import qualified PlutusTx
 import qualified PlutusTx.AssocMap as AssocMap
 import qualified PlutusTx.Builtins as Builtins
 
-newtype InitialDatum = InitialDatum
-  { headId :: CurrencySymbol
-  }
-
-PlutusTx.unstableMakeIsData ''InitialDatum
-
 data InitialRedeemer
   = ViaAbort
   | ViaCommit
@@ -55,7 +49,7 @@ data InitialRedeemer
 
 PlutusTx.unstableMakeIsData ''InitialRedeemer
 
-type DatumType = InitialDatum
+type DatumType = CurrencySymbol
 type RedeemerType = InitialRedeemer
 
 -- | The v_initial validator verifies that:
@@ -72,11 +66,11 @@ type RedeemerType = InitialRedeemer
 validator ::
   -- | Commit validator
   ValidatorHash ->
-  InitialDatum ->
-  InitialRedeemer ->
+  DatumType ->
+  RedeemerType ->
   ScriptContext ->
   Bool
-validator commitValidator InitialDatum{headId} red context =
+validator commitValidator headId red context =
   case red of
     ViaAbort ->
       traceIfFalse "ST not burned" (mustBurnST (txInfoMint $ scriptContextTxInfo context) headId)

From 0d4d233dc1e5aab07cef396859807d9709ccbdc4 Mon Sep 17 00:00:00 2001
From: Pascal Grange <pascal@grange.nom.fr>
Date: Wed, 11 Jan 2023 09:17:54 +0000
Subject: [PATCH 76/85] Using lambda case style guide

---
 hydra-node/test/Hydra/Chain/Direct/TxSpec.hs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
index 82d8b449771..5a5d2ca4d38 100644
--- a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
@@ -192,8 +192,9 @@ generateCommitUTxOs parties = do
             ]
         ]
     commitScript = fromPlutusScript Commit.validatorScript
-    commitDatum (Just (_input, _)) = mkCommitDatum party Head.validatorHash utxo (toPlutusCurrencySymbol testPolicyId)
-    commitDatum Nothing = error "Missing utxo"
+    commitDatum = \case
+      (Just (_input, _)) -> mkCommitDatum party Head.validatorHash utxo (toPlutusCurrencySymbol testPolicyId)
+      Nothing -> error "Missing utxo"
 
 prettyEvaluationReport :: EvaluationReport -> String
 prettyEvaluationReport (Map.toList -> xs) =

From a942c8cead6ac7436b9af226b5334e2000812bdc Mon Sep 17 00:00:00 2001
From: Pascal Grange <pascal@grange.nom.fr>
Date: Wed, 11 Jan 2023 09:19:33 +0000
Subject: [PATCH 77/85] We did'nt fix this acutally

---
 hydra-node/test/Hydra/Chain/Direct/StateSpec.hs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
index 58e74b1e3de..c091c6c80fd 100644
--- a/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/StateSpec.hs
@@ -334,6 +334,7 @@ forAllClose ::
   (UTxO -> Tx -> property) ->
   Property
 forAllClose action = do
+  -- FIXME: we should not hardcode number of parties but generate it within bounds
   forAll (genCloseTx maximumNumberOfParties) $ \(ctx, st, tx, sn) ->
     let utxo = getKnownUTxO st <> getKnownUTxO ctx
      in action utxo tx

From 2db7cd1aeb24ba21307806854d7c57f34e43246f Mon Sep 17 00:00:00 2001
From: Pascal Grange <pascal@grange.nom.fr>
Date: Wed, 11 Jan 2023 09:22:24 +0000
Subject: [PATCH 78/85] FIX comment

---
 .../test/Hydra/Chain/Direct/Contract/Mutation.hs       | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
index f95047baede..ffb2cd96bbc 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Mutation.hs
@@ -116,10 +116,12 @@
 --     does not survive random adversarial mutations
 --       +++ OK, passed 200 tests.
 --
---       CollectComMutation (200 in total):
---       30.5% MutateOpenUtxoHash
---       27.0% MutateHeadTransition
---       23.5% MutateOpenOutputValue
+--       CollectComMutation (100 in total):
+--       23% MutateNumberOfParties
+--       22% MutateHeadTransition
+--       21% MutateHeadId
+--       19% MutateOpenUTxOHash
+--       15% MutateRequiredSigner
 --
 -- Finished in 18.1146 seconds
 -- @

From c240341dd9fd5704876bf2048d114aa1be0aaacb Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Wed, 11 Jan 2023 10:38:06 +0100
Subject: [PATCH 79/85] Don't use InitialState for checkCollectCom

---
 hydra-plutus/src/Hydra/Contract/Head.hs | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index 4d805fa8574..187fc0a4420 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -66,8 +66,8 @@ headValidator ::
   Bool
 headValidator oldState input ctx =
   case (oldState, input) of
-    (initialState@Initial{}, CollectCom) ->
-      checkCollectCom ctx initialState
+    (Initial{contestationPeriod, parties, initialHeadId}, CollectCom) ->
+      checkCollectCom ctx (contestationPeriod, parties, initialHeadId)
     (Initial{parties, initialHeadId}, Abort) ->
       checkAbort ctx initialHeadId parties
     (Open{parties, utxoHash = initialUtxoHash, contestationPeriod, headId}, Close{snapshotNumber, utxoHash = closedUtxoHash, signature}) ->
@@ -128,14 +128,13 @@ checkAbort ctx@ScriptContext{scriptContextTxInfo = txInfo} headCurrencySymbol pa
 checkCollectCom ::
   -- | Script execution context
   ScriptContext ->
-  -- | Initial state
-  State ->
+  (ContestationPeriod, [Party], CurrencySymbol) ->
   Bool
-checkCollectCom ctx@ScriptContext{scriptContextTxInfo = txInfo} Initial{contestationPeriod, parties, initialHeadId} =
+checkCollectCom ctx@ScriptContext{scriptContextTxInfo = txInfo} (contestationPeriod, parties, headId) =
   mustContinueHeadWith ctx headAddress expectedChangeValue expectedOutputDatum
     && everyoneHasCommitted
-    && mustBeSignedByParticipant ctx initialHeadId
-    && hasST initialHeadId outValue
+    && mustBeSignedByParticipant ctx headId
+    && hasST headId outValue
  where
   headAddress = mkHeadAddress ctx
   outValue =
@@ -151,7 +150,7 @@ checkCollectCom ctx@ScriptContext{scriptContextTxInfo = txInfo} Initial{contesta
   expectedOutputDatum :: Datum
   expectedOutputDatum =
     let utxoHash = hashPreSerializedCommits collectedCommits
-     in Datum $ toBuiltinData Open{parties, utxoHash, contestationPeriod, headId = initialHeadId}
+     in Datum $ toBuiltinData Open{parties, utxoHash, contestationPeriod, headId = headId}
 
   -- Collect fuel and commits from resolved inputs. Any output containing a PT
   -- is treated as a commit, "our" output is the head output and all remaining
@@ -182,7 +181,7 @@ checkCollectCom ctx@ScriptContext{scriptContextTxInfo = txInfo} Initial{contesta
   isHeadOutput txOut = txOutAddress txOut == headAddress
 
   hasPT txOut =
-    let pts = findParticipationTokens initialHeadId (txOutValue txOut)
+    let pts = findParticipationTokens headId (txOutValue txOut)
      in length pts == 1
 
   commitDatum :: TxOut -> Maybe Commit
@@ -193,7 +192,6 @@ checkCollectCom ctx@ScriptContext{scriptContextTxInfo = txInfo} Initial{contesta
         mCommit
       Nothing ->
         traceError "commitDatum failed fromBuiltinData"
-checkCollectCom _context _ = traceError "Expected Initial state in checkCollectCom"
 {-# INLINEABLE checkCollectCom #-}
 
 -- | The close validator must verify that:

From 4f7415563f49bb898916233675f45b2983ee399f Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Wed, 11 Jan 2023 10:44:57 +0100
Subject: [PATCH 80/85] Add back the traces in the v_head

---
 hydra-plutus/src/Hydra/Contract/Head.hs | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index 187fc0a4420..d1cd0f5780d 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -222,7 +222,7 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
     && mustBeSignedByParticipant ctx headPolicyId
     && hasST headPolicyId outValue
  where
-  hasBoundedValidity = tMax - tMin <= cp
+  hasBoundedValidity = traceIfFalse "hasBoundedValidity check failed" $ tMax - tMin <= cp
 
   outValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
@@ -302,14 +302,15 @@ checkContest ctx@ScriptContext{scriptContextTxInfo} contestationDeadline parties
   outValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
   mustBeNewer =
-    contestSnapshotNumber > closedSnapshotNumber
+    traceIfFalse "too old snapshot" $ contestSnapshotNumber > closedSnapshotNumber
 
   mustBeMultiSigned =
     verifySnapshotSignature parties contestSnapshotNumber contestUtxoHash sig
 
   mustBeWithinContestationPeriod =
     case ivTo (txInfoValidRange scriptContextTxInfo) of
-      UpperBound (Finite time) _ -> time <= contestationDeadline
+      UpperBound (Finite time) _ ->
+        traceIfFalse "upper bound validity beyond contestation deadline" $ time <= contestationDeadline
       _ -> traceError "no upper bound validity interval defined for contest"
 {-# INLINEABLE checkContest #-}
 
@@ -322,13 +323,14 @@ checkFanout ::
 checkFanout utxoHash contestationDeadline numberOfFanoutOutputs ScriptContext{scriptContextTxInfo = txInfo} =
   hasSameUTxOHash && afterContestationDeadline
  where
-  hasSameUTxOHash = fannedOutUtxoHash == utxoHash
+  hasSameUTxOHash = traceIfFalse "fannedOutUtxoHash /= closedUtxoHash" $ fannedOutUtxoHash == utxoHash
   fannedOutUtxoHash = hashTxOuts $ take numberOfFanoutOutputs txInfoOutputs
   TxInfo{txInfoOutputs} = txInfo
 
   afterContestationDeadline =
     case ivFrom (txInfoValidRange txInfo) of
-      LowerBound (Finite time) _ -> time > contestationDeadline
+      LowerBound (Finite time) _ ->
+        traceIfFalse "lower bound validity before contestation deadline" $ time > contestationDeadline
       _ -> traceError "no lower bound validity interval defined for fanout"
 {-# INLINEABLE checkFanout #-}
 
@@ -350,7 +352,8 @@ checkHeadOutputDatum ctx d =
     OutputDatumHash actualHash ->
       Just actualHash == expectedHash
     OutputDatum actual ->
-      getDatum actual == expectedData
+      traceIfFalse "output datum mismatch" $
+        getDatum actual == expectedData
  where
   expectedData = toBuiltinData d
 
@@ -469,13 +472,15 @@ hashTxOuts =
 
 verifySnapshotSignature :: [Party] -> SnapshotNumber -> BuiltinByteString -> [Signature] -> Bool
 verifySnapshotSignature parties snapshotNumber utxoHash sigs =
-  length parties == length sigs
-    && all (uncurry $ verifyPartySignature snapshotNumber utxoHash) (zip parties sigs)
+  traceIfFalse "signature verification failed" $
+    length parties == length sigs
+      && all (uncurry $ verifyPartySignature snapshotNumber utxoHash) (zip parties sigs)
 {-# INLINEABLE verifySnapshotSignature #-}
 
 verifyPartySignature :: SnapshotNumber -> BuiltinByteString -> Party -> Signature -> Bool
-verifyPartySignature snapshotNumber utxoHash party =
-  verifyEd25519Signature (vkey party) message
+verifyPartySignature snapshotNumber utxoHash party signed =
+  traceIfFalse "party signature verification failed" $
+    verifyEd25519Signature (vkey party) message signed
  where
   message =
     -- TODO: document CDDL format, either here or in 'Hydra.Snapshot.getSignableRepresentation'

From dd177429660cff36a17596223f97b8b4df1564b6 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Wed, 11 Jan 2023 11:37:44 +0100
Subject: [PATCH 81/85] Rename State head fields to be uniform

---
 hydra-node/src/Hydra/Chain/Direct/State.hs     |  6 +++---
 hydra-node/src/Hydra/Chain/Direct/Tx.hs        |  4 ++--
 .../test/Hydra/Chain/Direct/Contract/Close.hs  |  6 +++---
 .../Hydra/Chain/Direct/Contract/CollectCom.hs  |  2 +-
 .../Hydra/Chain/Direct/Contract/Contest.hs     |  6 +++---
 .../test/Hydra/Chain/Direct/Contract/FanOut.hs |  2 +-
 hydra-plutus/src/Hydra/Contract/Head.hs        | 18 +++++++++---------
 hydra-plutus/src/Hydra/Contract/HeadState.hs   |  4 ++--
 8 files changed, 24 insertions(+), 24 deletions(-)

diff --git a/hydra-node/src/Hydra/Chain/Direct/State.hs b/hydra-node/src/Hydra/Chain/Direct/State.hs
index 17b7d8613d0..d88a4b29c33 100644
--- a/hydra-node/src/Hydra/Chain/Direct/State.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/State.hs
@@ -552,19 +552,19 @@ observeCollect st tx = do
   let utxo = getKnownUTxO st
   observation <- observeCollectComTx utxo tx
   let CollectComObservation{threadOutput, headId = collectComHeadId, utxoHash} = observation
-  guard (initialHeadId == collectComHeadId)
+  guard (headId == collectComHeadId)
   let event = OnCollectComTx
   let st' =
         OpenState
           { openThreadOutput = threadOutput
-          , headId = initialHeadId
+          , headId = headId
           , openHeadTokenScript = initialHeadTokenScript
           , openUtxoHash = utxoHash
           }
   pure (event, st')
  where
   InitialState
-    { headId = initialHeadId
+    { headId = headId
     , initialHeadTokenScript
     } = st
 
diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index d86f700cef3..4326d8e8db3 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -365,7 +365,7 @@ closeTx vk closing startSlotNo (endSlotNo, utcTime) openThreadOutput headId =
         , utxoHash = toBuiltin utxoHashBytes
         , parties = openParties
         , contestationDeadline
-        , closedHeadId = headIdToCurrencySymbol headId
+        , headId = headIdToCurrencySymbol headId
         }
 
   snapshotNumber = toInteger $ case closing of
@@ -429,7 +429,7 @@ contestTx vk Snapshot{number, utxo} sig (slotNo, _) ClosedThreadOutput{closedThr
         , utxoHash
         , parties = closedParties
         , contestationDeadline = closedContestationDeadline
-        , closedHeadId = headIdToCurrencySymbol headId
+        , headId = headIdToCurrencySymbol headId
         }
   utxoHash = toBuiltin $ hashUTxO @Tx utxo
 
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index 98bb77611b9..33f35a50916 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -225,13 +225,13 @@ genCloseMutation (tx, _utxo) =
     pure $ changeHeadOutputDatum (mutateHash mutatedUTxOHash) headTxOut
 
   mutateHash mutatedUTxOHash = \case
-    Head.Closed{snapshotNumber, parties, contestationDeadline, closedHeadId} ->
+    Head.Closed{snapshotNumber, parties, contestationDeadline, headId} ->
       Head.Closed
         { snapshotNumber
         , utxoHash = toBuiltin mutatedUTxOHash
         , parties
         , contestationDeadline
-        , closedHeadId
+        , headId
         }
     st -> error $ "unexpected state " <> show st
   -- In case contestation period param is 'Nothing' we will generate arbitrary value
@@ -250,6 +250,6 @@ genCloseMutation (tx, _utxo) =
         , contestationDeadline =
             let closingTime = slotNoToUTCTime healthySlotNo
              in posixFromUTCTime $ addUTCTime (fromInteger contestationPeriod) closingTime
-        , closedHeadId = toPlutusCurrencySymbol Fixture.testPolicyId
+        , headId = toPlutusCurrencySymbol Fixture.testPolicyId
         }
     st -> error $ "unexpected state " <> show st
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
index fe5174de3d8..68419e401d7 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
@@ -105,7 +105,7 @@ healthyCollectComInitialDatum =
   Head.Initial
     { contestationPeriod = healthyContestationPeriod
     , parties = healthyOnChainParties
-    , initialHeadId = toPlutusCurrencySymbol testPolicyId
+    , headId = toPlutusCurrencySymbol testPolicyId
     }
 
 healthyOnChainParties :: [OnChain.Party]
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
index c1331a0018d..0cfb05e2b21 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
@@ -102,7 +102,7 @@ healthyClosedState =
     , utxoHash = healthyClosedUTxOHash
     , parties = healthyOnChainParties
     , contestationDeadline = posixFromUTCTime healthyContestationDeadline
-    , closedHeadId = toPlutusCurrencySymbol testPolicyId
+    , headId = toPlutusCurrencySymbol testPolicyId
     }
 
 healthySlotNo :: SlotNo
@@ -203,7 +203,7 @@ genContestMutation
               , utxoHash = healthyClosedUTxOHash
               , snapshotNumber = fromIntegral healthyClosedSnapshotNumber
               , contestationDeadline = arbitrary `generateWith` 42
-              , closedHeadId = toPlutusCurrencySymbol testPolicyId
+              , headId = toPlutusCurrencySymbol testPolicyId
               }
       , SomeMutation MutateValidityPastDeadline . ChangeValidityInterval <$> do
           lb <- arbitrary
@@ -234,7 +234,7 @@ genContestMutation
                 , utxoHash = toBuiltin mutatedUTxOHash
                 , parties = healthyOnChainParties
                 , contestationDeadline = arbitrary `generateWith` 42
-                , closedHeadId = toPlutusCurrencySymbol testPolicyId
+                , headId = toPlutusCurrencySymbol testPolicyId
                 }
           )
           headTxOut
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
index 907b8728067..7678e58101f 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
@@ -80,7 +80,7 @@ healthyFanoutDatum =
     , utxoHash = toBuiltin $ hashUTxO @Tx healthyFanoutUTxO
     , parties = partyToChain <$> arbitrary `generateWith` 42
     , contestationDeadline = posixFromUTCTime healthyContestationDeadline
-    , closedHeadId = toPlutusCurrencySymbol testPolicyId
+    , headId = toPlutusCurrencySymbol testPolicyId
     }
 
 data FanoutMutation
diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index d1cd0f5780d..8a9dc6a47d7 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -66,14 +66,14 @@ headValidator ::
   Bool
 headValidator oldState input ctx =
   case (oldState, input) of
-    (Initial{contestationPeriod, parties, initialHeadId}, CollectCom) ->
-      checkCollectCom ctx (contestationPeriod, parties, initialHeadId)
-    (Initial{parties, initialHeadId}, Abort) ->
-      checkAbort ctx initialHeadId parties
+    (Initial{contestationPeriod, parties, headId}, CollectCom) ->
+      checkCollectCom ctx (contestationPeriod, parties, headId)
+    (Initial{parties, headId}, Abort) ->
+      checkAbort ctx headId parties
     (Open{parties, utxoHash = initialUtxoHash, contestationPeriod, headId}, Close{snapshotNumber, utxoHash = closedUtxoHash, signature}) ->
       checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash signature contestationPeriod headId
-    (Closed{parties, snapshotNumber = closedSnapshotNumber, contestationDeadline, closedHeadId}, Contest{snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, signature}) ->
-      checkContest ctx contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash signature closedHeadId
+    (Closed{parties, snapshotNumber = closedSnapshotNumber, contestationDeadline, headId}, Contest{snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, signature}) ->
+      checkContest ctx contestationDeadline parties closedSnapshotNumber contestSnapshotNumber contestUtxoHash signature headId
     (Closed{utxoHash, contestationDeadline}, Fanout{numberOfFanoutOutputs}) ->
       checkFanout utxoHash contestationDeadline numberOfFanoutOutputs ctx
     _ ->
@@ -235,7 +235,7 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
               , snapshotNumber = 0
               , utxoHash = initialUtxoHash
               , contestationDeadline = makeContestationDeadline cperiod ctx
-              , closedHeadId = headPolicyId
+              , headId = headPolicyId
               }
        in checkHeadOutputDatum ctx expectedOutputDatum
     | snapshotNumber > 0 =
@@ -245,7 +245,7 @@ checkClose ctx parties initialUtxoHash snapshotNumber closedUtxoHash sig cperiod
               , snapshotNumber
               , utxoHash = closedUtxoHash
               , contestationDeadline = makeContestationDeadline cperiod ctx
-              , closedHeadId = headPolicyId
+              , headId = headPolicyId
               }
        in verifySnapshotSignature parties snapshotNumber closedUtxoHash sig
             && checkHeadOutputDatum ctx expectedOutputDatum
@@ -294,7 +294,7 @@ checkContest ctx@ScriptContext{scriptContextTxInfo} contestationDeadline parties
     && mustBeMultiSigned
     && checkHeadOutputDatum
       ctx
-      (Closed{parties, snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, contestationDeadline, closedHeadId = headPolicyId})
+      (Closed{parties, snapshotNumber = contestSnapshotNumber, utxoHash = contestUtxoHash, contestationDeadline, headId = headPolicyId})
     && mustBeSignedByParticipant ctx headPolicyId
     && mustBeWithinContestationPeriod
     && hasST headPolicyId outValue
diff --git a/hydra-plutus/src/Hydra/Contract/HeadState.hs b/hydra-plutus/src/Hydra/Contract/HeadState.hs
index bb435e686ff..be1880fab0b 100644
--- a/hydra-plutus/src/Hydra/Contract/HeadState.hs
+++ b/hydra-plutus/src/Hydra/Contract/HeadState.hs
@@ -24,7 +24,7 @@ data State
   = Initial
       { contestationPeriod :: ContestationPeriod
       , parties :: [Party]
-      , initialHeadId :: CurrencySymbol
+      , headId :: CurrencySymbol
       }
   | Open
       { contestationPeriod :: ContestationPeriod
@@ -37,7 +37,7 @@ data State
       , snapshotNumber :: SnapshotNumber
       , utxoHash :: Hash
       , contestationDeadline :: POSIXTime
-      , closedHeadId :: CurrencySymbol
+      , headId :: CurrencySymbol
       }
   | Final
   deriving stock (Generic, Show)

From b056de303b2514de3a55c16cd5dba11fbfd1b415 Mon Sep 17 00:00:00 2001
From: Arnaud Bailly <arnaud.bailly@iohk.io>
Date: Wed, 11 Jan 2023 10:52:01 +0000
Subject: [PATCH 82/85] Output a realistic head datum in inspect-script

Also refactor couple functions to move them to hydra-plutus. This
change is larger than it should be.
---
 hydra-node/src/Hydra/Chain/Direct/Tx.hs       | 12 ++----------
 .../test/Hydra/Chain/Direct/Contract/Abort.hs |  3 +--
 .../test/Hydra/Chain/Direct/Contract/Close.hs |  3 ++-
 .../Hydra/Chain/Direct/Contract/CollectCom.hs |  2 +-
 .../Hydra/Chain/Direct/Contract/Commit.hs     |  3 ++-
 .../Hydra/Chain/Direct/Contract/Contest.hs    |  3 ++-
 .../Hydra/Chain/Direct/Contract/FanOut.hs     |  3 ++-
 hydra-node/test/Hydra/Chain/Direct/Fixture.hs |  3 ++-
 hydra-node/test/Hydra/Chain/Direct/TxSpec.hs  |  1 +
 hydra-plutus/exe/inspect-script/Main.hs       | 19 ++++++++++---------
 hydra-plutus/src/Hydra/Contract/HeadTokens.hs | 14 ++++++++++++++
 hydra-plutus/src/Hydra/Contract/Util.hs       |  1 +
 12 files changed, 40 insertions(+), 27 deletions(-)

diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index 4326d8e8db3..1caca685e8d 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -92,14 +92,6 @@ data ClosedThreadOutput = ClosedThreadOutput
   }
   deriving (Eq, Show, Generic, ToJSON, FromJSON)
 
-headPolicyId :: TxIn -> PolicyId
-headPolicyId =
-  scriptPolicyId . PlutusScript . mkHeadTokenScript
-
-mkHeadTokenScript :: TxIn -> PlutusScript
-mkHeadTokenScript =
-  fromPlutusScript @PlutusScriptV2 . HeadTokens.validatorScript . toPlutusTxOutRef
-
 hydraHeadV1AssetName :: AssetName
 hydraHeadV1AssetName = AssetName (fromBuiltin hydraHeadV1)
 
@@ -126,9 +118,9 @@ initTx networkId cardanoKeys parameters seed =
         ( mkHeadOutputInitial networkId policyId parameters :
           map (mkInitialOutput networkId policyId) cardanoKeys
         )
-      & mintTokens (mkHeadTokenScript seed) Mint ((hydraHeadV1AssetName, 1) : participationTokens)
+      & mintTokens (HeadTokens.mkHeadTokenScript seed) Mint ((hydraHeadV1AssetName, 1) : participationTokens)
  where
-  policyId = headPolicyId seed
+  policyId = HeadTokens.headPolicyId seed
   participationTokens =
     [(assetNameFromVerificationKey vk, 1) | vk <- cardanoKeys]
 
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
index 185f3f89c5e..4e8d911831d 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Abort.hs
@@ -24,13 +24,12 @@ import Hydra.Chain.Direct.ScriptRegistry (genScriptRegistry, registryUTxO)
 import Hydra.Chain.Direct.Tx (
   UTxOWithScript,
   abortTx,
-  headPolicyId,
   mkHeadOutputInitial,
-  mkHeadTokenScript,
  )
 import Hydra.Chain.Direct.TxSpec (drop3rd, genAbortableOutputs)
 import qualified Hydra.Contract.Commit as Commit
 import qualified Hydra.Contract.HeadState as Head
+import Hydra.Contract.HeadTokens (headPolicyId, mkHeadTokenScript)
 import qualified Hydra.Contract.Initial as Initial
 import Hydra.Ledger.Cardano (genVerificationKey)
 import Hydra.Party (Party, partyToChain)
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index 33f35a50916..e1edcd8456b 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -13,9 +13,10 @@ import Data.Maybe (fromJust)
 import Hydra.Chain.Direct.Contract.Mutation (Mutation (..), SomeMutation (..), addParticipationTokens, changeHeadOutputDatum, genHash, replacePolicyIdWith)
 import Hydra.Chain.Direct.Fixture (genForParty, testNetworkId)
 import qualified Hydra.Chain.Direct.Fixture as Fixture
-import Hydra.Chain.Direct.Tx (ClosingSnapshot (..), OpenThreadOutput (..), UTxOHash (UTxOHash), closeTx, headPolicyId, mkHeadId, mkHeadOutput)
+import Hydra.Chain.Direct.Tx (ClosingSnapshot (..), OpenThreadOutput (..), UTxOHash (UTxOHash), closeTx, mkHeadId, mkHeadOutput)
 import Hydra.ContestationPeriod (fromChain)
 import qualified Hydra.Contract.HeadState as Head
+import Hydra.Contract.HeadTokens (headPolicyId)
 import Hydra.Crypto (HydraKey, MultiSignature, aggregate, sign, toPlutusSignatures)
 import Hydra.Data.ContestationPeriod (posixFromUTCTime)
 import qualified Hydra.Data.ContestationPeriod as OnChain
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
index 68419e401d7..06f7ef4064b 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/CollectCom.hs
@@ -26,7 +26,6 @@ import Hydra.Chain.Direct.Tx (
   InitialThreadOutput (..),
   assetNameFromVerificationKey,
   collectComTx,
-  headPolicyId,
   headValue,
   mkCommitDatum,
   mkHeadId,
@@ -35,6 +34,7 @@ import Hydra.Chain.Direct.Tx (
 import qualified Hydra.Contract.Commit as Commit
 import qualified Hydra.Contract.Head as Head
 import qualified Hydra.Contract.HeadState as Head
+import Hydra.Contract.HeadTokens (headPolicyId)
 import qualified Hydra.Data.ContestationPeriod as OnChain
 import qualified Hydra.Data.Party as OnChain
 import Hydra.Ledger.Cardano (genAdaOnlyUTxO, genTxIn, genVerificationKey)
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
index 84f6e2085ed..25a485ed5e4 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Commit.hs
@@ -17,7 +17,8 @@ import Hydra.Chain.Direct.Contract.Mutation (
  )
 import qualified Hydra.Chain.Direct.Fixture as Fixture
 import Hydra.Chain.Direct.ScriptRegistry (genScriptRegistry, registryUTxO)
-import Hydra.Chain.Direct.Tx (commitTx, headPolicyId, mkHeadId, mkInitialOutput)
+import Hydra.Chain.Direct.Tx (commitTx, mkHeadId, mkInitialOutput)
+import Hydra.Contract.HeadTokens (headPolicyId)
 import qualified Hydra.Contract.Initial as Initial
 import Hydra.Ledger.Cardano (
   genAddressInEra,
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
index 0cfb05e2b21..5a96b93a464 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Contest.hs
@@ -19,8 +19,9 @@ import Hydra.Chain.Direct.Contract.Mutation (
   replacePolicyIdWith,
  )
 import Hydra.Chain.Direct.Fixture (genForParty, testNetworkId, testPolicyId)
-import Hydra.Chain.Direct.Tx (ClosedThreadOutput (..), contestTx, headPolicyId, mkHeadId, mkHeadOutput)
+import Hydra.Chain.Direct.Tx (ClosedThreadOutput (..), contestTx, mkHeadId, mkHeadOutput)
 import qualified Hydra.Contract.HeadState as Head
+import Hydra.Contract.HeadTokens (headPolicyId)
 import Hydra.Crypto (HydraKey, MultiSignature, aggregate, sign, toPlutusSignatures)
 import Hydra.Data.ContestationPeriod (posixFromUTCTime)
 import qualified Hydra.Data.Party as OnChain
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
index 7678e58101f..b3a7c940e40 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/FanOut.hs
@@ -11,8 +11,9 @@ import Hydra.Prelude hiding (label)
 import Cardano.Api.UTxO as UTxO
 import Hydra.Chain.Direct.Contract.Mutation (Mutation (..), SomeMutation (..))
 import Hydra.Chain.Direct.Fixture (testNetworkId, testPolicyId, testSeedInput)
-import Hydra.Chain.Direct.Tx (fanoutTx, mkHeadOutput, mkHeadTokenScript)
+import Hydra.Chain.Direct.Tx (fanoutTx, mkHeadOutput)
 import qualified Hydra.Contract.HeadState as Head
+import Hydra.Contract.HeadTokens (mkHeadTokenScript)
 import Hydra.Data.ContestationPeriod (posixFromUTCTime)
 import Hydra.Ledger (IsTx (hashUTxO))
 import Hydra.Ledger.Cardano (
diff --git a/hydra-node/test/Hydra/Chain/Direct/Fixture.hs b/hydra-node/test/Hydra/Chain/Direct/Fixture.hs
index 2228e7ef427..91f9c3d269c 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Fixture.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Fixture.hs
@@ -27,7 +27,8 @@ import Hydra.Cardano.Api (
   TxIn,
   verificationKeyHash,
  )
-import Hydra.Chain.Direct.Tx (headPolicyId)
+import Hydra.Chain.Direct.Tx ()
+import Hydra.Contract.HeadTokens (headPolicyId)
 import Hydra.Crypto (Hash (HydraKeyHash))
 import Hydra.Ledger.Cardano.Configuration (newLedgerEnv)
 import Hydra.Ledger.Cardano.Evaluate (epochInfo, pparams, systemStart)
diff --git a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
index 5a5d2ca4d38..6362bec0735 100644
--- a/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/TxSpec.hs
@@ -33,6 +33,7 @@ import Hydra.Chain.Direct.Wallet (ErrCoverFee (..), coverFee_)
 import Hydra.ContestationPeriod (ContestationPeriod (UnsafeContestationPeriod))
 import qualified Hydra.Contract.Commit as Commit
 import qualified Hydra.Contract.Head as Head
+import Hydra.Contract.HeadTokens (mkHeadTokenScript)
 import qualified Hydra.Contract.Initial as Initial
 import Hydra.Ledger.Cardano (
   adaOnly,
diff --git a/hydra-plutus/exe/inspect-script/Main.hs b/hydra-plutus/exe/inspect-script/Main.hs
index 2c6fadf5c8a..926c3346176 100644
--- a/hydra-plutus/exe/inspect-script/Main.hs
+++ b/hydra-plutus/exe/inspect-script/Main.hs
@@ -2,23 +2,22 @@
 
 module Main where
 
+import Hydra.Cardano.Api
 import Hydra.Prelude
 
-import Cardano.Api (ScriptDataJsonSchema (ScriptDataJsonDetailedSchema), scriptDataToJson, serialiseToTextEnvelope)
-import Cardano.Api.Shelley (fromPlutusData)
 import Codec.Serialise (serialise)
 import qualified Data.Aeson as Aeson
 import qualified Data.ByteString.Lazy as BL
 import Data.Text (pack)
-import Hydra.Cardano.Api (PlutusScriptV2, fromPlutusScript, hashScriptData)
+import Hydra.Cardano.Api.Prelude (unsafeHashFromBytes)
 import Hydra.Contract (scriptInfo)
 import Hydra.Contract.Commit as Commit
 import qualified Hydra.Contract.Hash as Hash
 import Hydra.Contract.Head as Head
 import Hydra.Contract.HeadState as Head
+import qualified Hydra.Contract.HeadTokens as HeadTokens
 import Hydra.Contract.Initial as Initial
-import Hydra.Contract.Util (hydraHeadV1)
-import Plutus.V2.Ledger.Api (CurrencySymbol (CurrencySymbol), Data, Script, toData)
+import Plutus.V2.Ledger.Api (Data, Script, toData)
 import PlutusTx (getPlc)
 import PlutusTx.Code (CompiledCode)
 import Prettyprinter (defaultLayoutOptions, layoutPretty, pretty)
@@ -48,7 +47,7 @@ main = do
   forM_ datums $ \(aDatum, datumName) ->
     putTextLn $ toText $ datumName <> ": " <> show (hashScriptData $ fromPlutusData aDatum)
  where
-  writeScripts :: [(Script, String)] -> IO ()
+  writeScripts :: [(Plutus.V2.Ledger.Api.Script, String)] -> IO ()
   writeScripts plutus =
     forM_ plutus $ \(item, itemName) -> do
       let itemFile = itemName <> ".plutus"
@@ -81,7 +80,7 @@ main = do
     [ (headScript, "headScript")
     , (initialScript, "initialScript")
     , (commitScript, "commitScript")
-    , (hashScript, "hashScript")
+    , (hashPlutusScript, "hashScript")
     ]
 
   headScript = Head.validatorScript
@@ -90,7 +89,7 @@ main = do
 
   initialScript = Initial.validatorScript
 
-  hashScript = Hash.validatorScript
+  hashPlutusScript = Hash.validatorScript
 
   compiledScripts =
     [ (Compiled Head.compiledValidator, "headScript")
@@ -103,7 +102,9 @@ main = do
     , (abortDatum, "abortDatum")
     ]
 
-  headDatum = toData $ Head.Initial 1_000_000_000_000 [] (CurrencySymbol hydraHeadV1)
+  headDatum = toData $ Head.Initial 1_000_000_000_000 [] (toPlutusCurrencySymbol $ HeadTokens.headPolicyId $ someTxIn)
+
+  someTxIn = TxIn (TxId $ unsafeHashFromBytes "01234567890123456789012345678901") (TxIx 1)
 
   abortDatum = toData Head.Final
 
diff --git a/hydra-plutus/src/Hydra/Contract/HeadTokens.hs b/hydra-plutus/src/Hydra/Contract/HeadTokens.hs
index 28cfdfd2f62..ee769df64ce 100644
--- a/hydra-plutus/src/Hydra/Contract/HeadTokens.hs
+++ b/hydra-plutus/src/Hydra/Contract/HeadTokens.hs
@@ -1,11 +1,15 @@
+{-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE TypeApplications #-}
+{-# OPTIONS_GHC -fno-specialize #-}
 
 -- | Minting policy for a single head tokens.
 module Hydra.Contract.HeadTokens where
 
 import PlutusTx.Prelude
 
+import Hydra.Cardano.Api (PlutusScriptV2, PolicyId, TxIn, fromPlutusScript, scriptPolicyId, toPlutusTxOutRef, pattern PlutusScript)
+import qualified Hydra.Cardano.Api as Api
 import qualified Hydra.Contract.Head as Head
 import qualified Hydra.Contract.HeadState as Head
 import qualified Hydra.Contract.Initial as Initial
@@ -144,3 +148,13 @@ validatorScript = getMintingPolicy . mintingPolicy
 
 validatorHash :: TxOutRef -> ValidatorHash
 validatorHash = scriptValidatorHash . validatorScript
+
+-- * Create PolicyId
+
+headPolicyId :: TxIn -> PolicyId
+headPolicyId =
+  scriptPolicyId . PlutusScript . mkHeadTokenScript
+
+mkHeadTokenScript :: TxIn -> Api.PlutusScript
+mkHeadTokenScript =
+  fromPlutusScript @PlutusScriptV2 . validatorScript . toPlutusTxOutRef
diff --git a/hydra-plutus/src/Hydra/Contract/Util.hs b/hydra-plutus/src/Hydra/Contract/Util.hs
index bb61cf0e541..6457a6fdb98 100644
--- a/hydra-plutus/src/Hydra/Contract/Util.hs
+++ b/hydra-plutus/src/Hydra/Contract/Util.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE TypeApplications #-}
 {-# OPTIONS_GHC -fno-specialize #-}
 
 module Hydra.Contract.Util where

From a31cfb24e26702e0ba140fd07d05910f27089360 Mon Sep 17 00:00:00 2001
From: Sebastian Nagel <sebastian.nagel@ncoding.at>
Date: Wed, 11 Jan 2023 15:13:21 +0100
Subject: [PATCH 83/85] Make import of orphan isntance more obvious

Hydra.Chain.Direct.Tx was not directly including the required orphan
instance, but Hydra.Ledger.Cardano is.
---
 hydra-node/test/Hydra/Chain/Direct/Fixture.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hydra-node/test/Hydra/Chain/Direct/Fixture.hs b/hydra-node/test/Hydra/Chain/Direct/Fixture.hs
index 91f9c3d269c..a6c8b1e7d03 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Fixture.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Fixture.hs
@@ -27,9 +27,9 @@ import Hydra.Cardano.Api (
   TxIn,
   verificationKeyHash,
  )
-import Hydra.Chain.Direct.Tx ()
 import Hydra.Contract.HeadTokens (headPolicyId)
 import Hydra.Crypto (Hash (HydraKeyHash))
+import Hydra.Ledger.Cardano ()
 import Hydra.Ledger.Cardano.Configuration (newLedgerEnv)
 import Hydra.Ledger.Cardano.Evaluate (epochInfo, pparams, systemStart)
 import Hydra.Party (Party (..))

From da1cdd92cfdb37cedc929a9e39c3705e4dd989cf Mon Sep 17 00:00:00 2001
From: Sebastian Nagel <sebastian.nagel@ncoding.at>
Date: Wed, 11 Jan 2023 15:13:58 +0100
Subject: [PATCH 84/85] Re-add traces

---
 hydra-plutus/src/Hydra/Contract/Head.hs | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index 8a9dc6a47d7..d1e998269e8 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -97,7 +97,8 @@ checkAbort ctx@ScriptContext{scriptContextTxInfo = txInfo} headCurrencySymbol pa
     && mustBeSignedByParticipant ctx headCurrencySymbol
  where
   mustBurnAllHeadTokens =
-    burntTokens == length parties + 1
+    traceIfFalse "number of inputs do not match number of parties" $
+      burntTokens == length parties + 1
 
   minted = getValue $ txInfoMint txInfo
 
@@ -137,10 +138,13 @@ checkCollectCom ctx@ScriptContext{scriptContextTxInfo = txInfo} (contestationPer
     && hasST headId outValue
  where
   headAddress = mkHeadAddress ctx
+
   outValue =
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
+
   everyoneHasCommitted =
-    nTotalCommits == length parties
+    traceIfFalse "not everyone committed" $
+      nTotalCommits == length parties
 
   (expectedChangeValue, collectedCommits, nTotalCommits) =
     traverseInputs
@@ -350,7 +354,8 @@ checkHeadOutputDatum ctx d =
     NoOutputDatum ->
       traceError "missing datum"
     OutputDatumHash actualHash ->
-      Just actualHash == expectedHash
+      traceIfFalse "output datum hash mismatch" $
+        Just actualHash == expectedHash
     OutputDatum actual ->
       traceIfFalse "output datum mismatch" $
         getDatum actual == expectedData

From e780c01646904ca9e697ca9d535392f76d80b5e6 Mon Sep 17 00:00:00 2001
From: Sasha Bogicevic <sasha.bogicevic@iohk.io>
Date: Wed, 11 Jan 2023 16:41:35 +0100
Subject: [PATCH 85/85] Reduce trace messages length

---
 hydra-plutus/src/Hydra/Contract/Head.hs | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index d1e998269e8..eade57219ce 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -97,7 +97,7 @@ checkAbort ctx@ScriptContext{scriptContextTxInfo = txInfo} headCurrencySymbol pa
     && mustBeSignedByParticipant ctx headCurrencySymbol
  where
   mustBurnAllHeadTokens =
-    traceIfFalse "number of inputs do not match number of parties" $
+    traceIfFalse "burnt token number mismatch" $
       burntTokens == length parties + 1
 
   minted = getValue $ txInfoMint txInfo
@@ -143,7 +143,7 @@ checkCollectCom ctx@ScriptContext{scriptContextTxInfo = txInfo} (contestationPer
     maybe mempty (txOutValue . txInInfoResolved) $ findOwnInput ctx
 
   everyoneHasCommitted =
-    traceIfFalse "not everyone committed" $
+    traceIfFalse "missing commits" $
       nTotalCommits == length parties
 
   (expectedChangeValue, collectedCommits, nTotalCommits) =
@@ -314,8 +314,8 @@ checkContest ctx@ScriptContext{scriptContextTxInfo} contestationDeadline parties
   mustBeWithinContestationPeriod =
     case ivTo (txInfoValidRange scriptContextTxInfo) of
       UpperBound (Finite time) _ ->
-        traceIfFalse "upper bound validity beyond contestation deadline" $ time <= contestationDeadline
-      _ -> traceError "no upper bound validity interval defined for contest"
+        traceIfFalse "upper bound beyond contestation deadline" $ time <= contestationDeadline
+      _ -> traceError "contest: no upper bound defined"
 {-# INLINEABLE checkContest #-}
 
 checkFanout ::
@@ -334,8 +334,8 @@ checkFanout utxoHash contestationDeadline numberOfFanoutOutputs ScriptContext{sc
   afterContestationDeadline =
     case ivFrom (txInfoValidRange txInfo) of
       LowerBound (Finite time) _ ->
-        traceIfFalse "lower bound validity before contestation deadline" $ time > contestationDeadline
-      _ -> traceError "no lower bound validity interval defined for fanout"
+        traceIfFalse "lower bound before contestation deadline" $ time > contestationDeadline
+      _ -> traceError "fanout: no lower bound defined"
 {-# INLINEABLE checkFanout #-}
 
 --------------------------------------------------------------------------------
@@ -354,7 +354,7 @@ checkHeadOutputDatum ctx d =
     NoOutputDatum ->
       traceError "missing datum"
     OutputDatumHash actualHash ->
-      traceIfFalse "output datum hash mismatch" $
+      traceIfFalse "wrong datum hash" $
         Just actualHash == expectedHash
     OutputDatum actual ->
       traceIfFalse "output datum mismatch" $
@@ -384,7 +384,7 @@ makeContestationDeadline :: ContestationPeriod -> ScriptContext -> POSIXTime
 makeContestationDeadline cperiod ScriptContext{scriptContextTxInfo} =
   case ivTo (txInfoValidRange scriptContextTxInfo) of
     UpperBound (Finite time) _ -> addContestationPeriod time cperiod
-    _ -> traceError "no upper bound validaty interval defined for close"
+    _ -> traceError "close: no upper bound defined"
 {-# INLINEABLE makeContestationDeadline #-}
 
 mkHeadAddress :: ScriptContext -> Address
@@ -405,9 +405,9 @@ mustBeSignedByParticipant ScriptContext{scriptContextTxInfo = txInfo} headCurren
     [signer] ->
       signer `elem` (unTokenName <$> participationTokens)
     [] ->
-      traceError "mustBeSignedByParticipant: no signers"
+      traceError "no signers"
     _ ->
-      traceError "mustBeSignedByParticipant: too many signers"
+      traceError "too many signers"
  where
   participationTokens = loop (txInfoInputs txInfo)
   loop = \case
@@ -446,7 +446,7 @@ mustContinueHeadWith ScriptContext{scriptContextTxInfo = txInfo} headAddress cha
       | txOutAddress o /= headAddress ->
         txOutValue o == lovelaceValue changeValue
     _ ->
-      traceError "invalid collect-com outputs: more than 2 outputs."
+      traceError "more than 2 outputs"
 
   lovelaceValue = assetClassValue (assetClass adaSymbol adaToken)
 {-# INLINEABLE mustContinueHeadWith #-}