strconv.FormatInt -> Uint64ToBigEndian for int encoding

x/state-verifier/keeper/keeper.go

@@ -2,7 +2,6 @@ package keeper
 
 import (
 	"fmt"
-	"strconv"
 
 	"cosmossdk.io/core/comet"
 	"cosmossdk.io/core/header"
@@ -143,11 +142,7 @@ func (k *Keeper) GetAllConsensusStates(ctx sdk.Context) ([]*types.ConsensusState
 	for ; iterator.Valid(); iterator.Next() {
 		cs := tendermint.ConsensusState{}
 		k.cdc.MustUnmarshal(iterator.Value(), &cs)
-		height, err := strconv.ParseInt(string(iterator.Key()), 10, 64)
-		if err != nil {
-			return nil, errors.Wrapf(err, "failed to extract height from consensus state key")
-		}
-
+		height := int64(sdk.BigEndianToUint64(iterator.Key()))
 		states = append(states, &types.ConsensusState{
 			Height: height,
 			Cs:     &cs,

x/state-verifier/types/keys.go

@@ -1,6 +1,8 @@
 package types
 
-import "strconv"
+import (
+	"github.com/cosmos/cosmos-sdk/types"
+)
 
 const (
 	// ModuleName defines the module name
@@ -17,5 +19,5 @@ const (
 var ConsensusStateKey = []byte{prefixConsensusStateKey}
 
 func GetConsensusStateKey(height int64) []byte {
-	return append(ConsensusStateKey, []byte(strconv.FormatInt(height, 10))...)
+	return append(ConsensusStateKey, types.Uint64ToBigEndian(uint64(height))...)
 }