feat: TX auxiliary data hash attribute

This adds a method for retrieving the auxiliary data hash from a TX

Fixes #334

ledger/allegra.go

@@ -186,6 +186,10 @@ func (t AllegraTransaction) Withdrawals() map[*Address]uint64 {
 	return t.Body.Withdrawals()
 }
 
+func (t AllegraTransaction) AuxDataHash() *Blake2b256 {
+	return t.Body.AuxDataHash()
+}
+
 func (t AllegraTransaction) RequiredSigners() []Blake2b224 {
 	return t.Body.RequiredSigners()
 }

ledger/alonzo.go

@@ -300,6 +300,10 @@ func (t AlonzoTransaction) Withdrawals() map[*Address]uint64 {
 	return t.Body.Withdrawals()
 }
 
+func (t AlonzoTransaction) AuxDataHash() *Blake2b256 {
+	return t.Body.AuxDataHash()
+}
+
 func (t AlonzoTransaction) RequiredSigners() []Blake2b224 {
 	return t.Body.RequiredSigners()
 }

ledger/babbage.go

@@ -468,6 +468,10 @@ func (t BabbageTransaction) Withdrawals() map[*Address]uint64 {
 	return t.Body.Withdrawals()
 }
 
+func (t BabbageTransaction) AuxDataHash() *Blake2b256 {
+	return t.Body.AuxDataHash()
+}
+
 func (t BabbageTransaction) ScriptDataHash() *Blake2b256 {
 	return t.Body.ScriptDataHash()
 }

ledger/byron.go

@@ -205,6 +205,11 @@ func (t *ByronTransaction) Withdrawals() map[*Address]uint64 {
 	return nil
 }
 
+func (t *ByronTransaction) AuxDataHash() *Blake2b256 {
+	// No aux data hash in Byron
+	return nil
+}
+
 func (t *ByronTransaction) RequiredSigners() []Blake2b224 {
 	// No required signers in Byron
 	return nil

ledger/conway.go

@@ -373,6 +373,10 @@ func (t ConwayTransaction) Withdrawals() map[*Address]uint64 {
 	return t.Body.Withdrawals()
 }
 
+func (t ConwayTransaction) AuxDataHash() *Blake2b256 {
+	return t.Body.AuxDataHash()
+}
+
 func (t ConwayTransaction) RequiredSigners() []Blake2b224 {
 	return t.Body.RequiredSigners()
 }

ledger/mary.go

@@ -203,6 +203,10 @@ func (t MaryTransaction) Withdrawals() map[*Address]uint64 {
 	return t.Body.Withdrawals()
 }
 
+func (t MaryTransaction) AuxDataHash() *Blake2b256 {
+	return t.Body.AuxDataHash()
+}
+
 func (t MaryTransaction) RequiredSigners() []Blake2b224 {
 	return t.Body.RequiredSigners()
 }

ledger/shelley.go

@@ -174,7 +174,7 @@ type ShelleyTransactionBody struct {
 		ProtocolParamUpdates map[Blake2b224]ShelleyProtocolParameterUpdate
 		Epoch                uint64
 	} `cbor:"6,keyasint,omitempty"`
-	MetadataHash Blake2b256 `cbor:"7,keyasint,omitempty"`
+	TxAuxDataHash *Blake2b256 `cbor:"7,keyasint,omitempty"`
 }
 
 func (b *ShelleyTransactionBody) UnmarshalCBOR(cborData []byte) error {
@@ -249,6 +249,10 @@ func (b *ShelleyTransactionBody) Withdrawals() map[*Address]uint64 {
 	return b.TxWithdrawals
 }
 
+func (b *ShelleyTransactionBody) AuxDataHash() *Blake2b256 {
+	return b.TxAuxDataHash
+}
+
 func (b *ShelleyTransactionBody) RequiredSigners() []Blake2b224 {
 	// No required signers in Shelley
 	return nil
@@ -436,6 +440,10 @@ func (t ShelleyTransaction) Withdrawals() map[*Address]uint64 {
 	return t.Body.Withdrawals()
 }
 
+func (t ShelleyTransaction) AuxDataHash() *Blake2b256 {
+	return t.Body.AuxDataHash()
+}
+
 func (t ShelleyTransaction) RequiredSigners() []Blake2b224 {
 	return t.Body.RequiredSigners()
 }

ledger/tx.go

@@ -47,6 +47,7 @@ type TransactionBody interface {
 	TotalCollateral() uint64
 	Certificates() []Certificate
 	Withdrawals() map[*Address]uint64
+	AuxDataHash() *Blake2b256
 	RequiredSigners() []Blake2b224
 	AssetMint() *MultiAsset[MultiAssetTypeMint]
 	ScriptDataHash() *Blake2b256