feat: Support getting ScriptRef from TransactionOutput interface

ledger/alonzo/alonzo.go

@@ -324,6 +324,10 @@ func (o AlonzoTransactionOutput) Address() common.Address {
 	return o.OutputAddress
 }
 
+func (o AlonzoTransactionOutput) GetScriptRef() *cbor.LazyValue {
+	return nil
+}
+
 func (o AlonzoTransactionOutput) Amount() uint64 {
 	return o.OutputAmount.Amount
 }

ledger/babbage/babbage.go

@@ -486,6 +486,16 @@ func (o BabbageTransactionOutput) Address() common.Address {
 	return o.OutputAddress
 }
 
+func (o BabbageTransactionOutput) GetScriptRef() *cbor.LazyValue {
+	if o.ScriptRef == nil {
+		return nil
+	}
+	if lazyVal, ok := o.ScriptRef.Content.(*cbor.LazyValue); ok {
+		return lazyVal
+	}
+	return nil
+}
+
 func (o BabbageTransactionOutput) Amount() uint64 {
 	return o.OutputAmount.Amount
 }

ledger/byron/byron.go

@@ -414,6 +414,10 @@ func (o ByronTransactionOutput) Address() common.Address {
 	return o.OutputAddress
 }
 
+func (o ByronTransactionOutput) GetScriptRef() *cbor.LazyValue {
+	return nil
+}
+
 func (o ByronTransactionOutput) Amount() uint64 {
 	return o.OutputAmount
 }

ledger/common/tx.go

@@ -71,6 +71,7 @@ type TransactionOutput interface {
 	DatumHash() *Blake2b256
 	Cbor() []byte
 	Utxorpc() (*utxorpc.TxOutput, error)
+	GetScriptRef() *cbor.LazyValue
 }
 
 type TransactionWitnessSet interface {

ledger/mary/mary.go

@@ -446,6 +446,10 @@ func (o MaryTransactionOutput) Address() common.Address {
 	return o.OutputAddress
 }
 
+func (txo MaryTransactionOutput) GetScriptRef() *cbor.LazyValue {
+	return nil
+}
+
 func (o MaryTransactionOutput) Amount() uint64 {
 	return o.OutputAmount.Amount
 }

ledger/shelley/shelley.go

@@ -388,6 +388,10 @@ func (o ShelleyTransactionOutput) Address() common.Address {
 	return o.OutputAddress
 }
 
+func (o ShelleyTransactionOutput) GetScriptRef() *cbor.LazyValue {
+	return nil
+}
+
 func (o ShelleyTransactionOutput) Amount() uint64 {
 	return o.OutputAmount
 }