feat: TX asset mint attribute

This adds a method for retrieving any asset mints from a TX

Fixes #336

ledger/allegra.go

@@ -182,6 +182,10 @@ func (t AllegraTransaction) RequiredSigners() []Blake2b224 {
 	return t.Body.RequiredSigners()
 }
 
+func (t AllegraTransaction) AssetMint() *MultiAsset[MultiAssetTypeMint] {
+	return t.Body.AssetMint()
+}
+
 func (t AllegraTransaction) VotingProcedures() VotingProcedures {
 	return t.Body.VotingProcedures()
 }

ledger/alonzo.go

@@ -296,6 +296,10 @@ func (t AlonzoTransaction) RequiredSigners() []Blake2b224 {
 	return t.Body.RequiredSigners()
 }
 
+func (t AlonzoTransaction) AssetMint() *MultiAsset[MultiAssetTypeMint] {
+	return t.Body.AssetMint()
+}
+
 func (t AlonzoTransaction) VotingProcedures() VotingProcedures {
 	return t.Body.VotingProcedures()
 }

ledger/babbage.go

@@ -472,6 +472,10 @@ func (t BabbageTransaction) RequiredSigners() []Blake2b224 {
 	return t.Body.RequiredSigners()
 }
 
+func (t BabbageTransaction) AssetMint() *MultiAsset[MultiAssetTypeMint] {
+	return t.Body.AssetMint()
+}
+
 func (t BabbageTransaction) ProposalProcedures() []ProposalProcedure {
 	return t.Body.ProposalProcedures()
 }

ledger/byron.go

@@ -205,6 +205,11 @@ func (t *ByronTransaction) RequiredSigners() []Blake2b224 {
 	return nil
 }
 
+func (t *ByronTransaction) AssetMint() *MultiAsset[MultiAssetTypeMint] {
+	// No asset mints in Byron
+	return nil
+}
+
 func (t *ByronTransaction) VotingProcedures() VotingProcedures {
 	// No voting procedures in Byron
 	return nil

ledger/conway.go

@@ -373,6 +373,10 @@ func (t ConwayTransaction) RequiredSigners() []Blake2b224 {
 	return t.Body.RequiredSigners()
 }
 
+func (t ConwayTransaction) AssetMint() *MultiAsset[MultiAssetTypeMint] {
+	return t.Body.AssetMint()
+}
+
 func (t ConwayTransaction) VotingProcedures() VotingProcedures {
 	return t.Body.VotingProcedures()
 }

ledger/mary.go

@@ -120,8 +120,8 @@ type MaryTransactionBody struct {
 		ProtocolParamUpdates map[Blake2b224]MaryProtocolParameterUpdate
 		Epoch                uint64
 	} `cbor:"6,keyasint,omitempty"`
-	TxOutputs []MaryTransactionOutput        `cbor:"1,keyasint,omitempty"`
-	Mint      MultiAsset[MultiAssetTypeMint] `cbor:"9,keyasint,omitempty"`
+	TxOutputs []MaryTransactionOutput         `cbor:"1,keyasint,omitempty"`
+	TxMint    *MultiAsset[MultiAssetTypeMint] `cbor:"9,keyasint,omitempty"`
 }
 
 func (b *MaryTransactionBody) UnmarshalCBOR(cborData []byte) error {
@@ -137,6 +137,10 @@ func (b *MaryTransactionBody) Outputs() []TransactionOutput {
 	return ret
 }
 
+func (b *MaryTransactionBody) AssetMint() *MultiAsset[MultiAssetTypeMint] {
+	return b.TxMint
+}
+
 type MaryTransaction struct {
 	cbor.StructAsArray
 	cbor.DecodeStoreCbor
@@ -199,6 +203,10 @@ func (t MaryTransaction) RequiredSigners() []Blake2b224 {
 	return t.Body.RequiredSigners()
 }
 
+func (t MaryTransaction) AssetMint() *MultiAsset[MultiAssetTypeMint] {
+	return t.Body.AssetMint()
+}
+
 func (t MaryTransaction) VotingProcedures() VotingProcedures {
 	return t.Body.VotingProcedures()
 }

ledger/shelley.go

@@ -249,6 +249,11 @@ func (b *ShelleyTransactionBody) RequiredSigners() []Blake2b224 {
 	return nil
 }
 
+func (b *ShelleyTransactionBody) AssetMint() *MultiAsset[MultiAssetTypeMint] {
+	// No asset minting in Shelley
+	return nil
+}
+
 func (t *ShelleyTransactionBody) VotingProcedures() VotingProcedures {
 	// No voting procedures in Shelley
 	return nil
@@ -421,6 +426,10 @@ func (t ShelleyTransaction) RequiredSigners() []Blake2b224 {
 	return t.Body.RequiredSigners()
 }
 
+func (t ShelleyTransaction) AssetMint() *MultiAsset[MultiAssetTypeMint] {
+	return t.Body.AssetMint()
+}
+
 func (t ShelleyTransaction) VotingProcedures() VotingProcedures {
 	return t.Body.VotingProcedures()
 }

ledger/tx.go

@@ -47,6 +47,7 @@ type TransactionBody interface {
 	Certificates() []Certificate
 	Withdrawals() map[*Address]uint64
 	RequiredSigners() []Blake2b224
+	AssetMint() *MultiAsset[MultiAssetTypeMint]
 	VotingProcedures() VotingProcedures
 	ProposalProcedures() []ProposalProcedure
 	Utxorpc() *utxorpc.Tx