diff --git a/ledger/allegra.go b/ledger/allegra.go
index 246d79e5..40622259 100644
--- a/ledger/allegra.go
+++ b/ledger/allegra.go
@@ -130,6 +130,14 @@ func (b *AllegraTransactionBody) ValidityIntervalStart() uint64 {
 	return b.TxValidityIntervalStart
 }
 
+func (b *AllegraTransactionBody) ProtocolParametersUpdate() map[Blake2b224]any {
+	updateMap := make(map[Blake2b224]any)
+	for k, v := range b.Update.ProtocolParamUpdates {
+		updateMap[k] = v
+	}
+	return updateMap
+}
+
 type AllegraTransaction struct {
 	cbor.StructAsArray
 	cbor.DecodeStoreCbor
@@ -238,12 +246,8 @@ func (t AllegraTransaction) Produced() []TransactionOutput {
 	return t.Outputs()
 }
 
-func (t *AllegraTransaction) ProtocolParametersUpdate() map[Blake2b224]any {
-	updateMap := make(map[Blake2b224]any)
-	for k, v := range t.Body.Update.ProtocolParamUpdates {
-		updateMap[k] = v
-	}
-	return updateMap
+func (t AllegraTransaction) ProtocolParametersUpdate() map[Blake2b224]any {
+	return t.Body.ProtocolParametersUpdate()
 }
 
 func (t *AllegraTransaction) Cbor() []byte {
diff --git a/ledger/alonzo.go b/ledger/alonzo.go
index 5c86d0bb..b6e842ba 100644
--- a/ledger/alonzo.go
+++ b/ledger/alonzo.go
@@ -147,6 +147,14 @@ func (b *AlonzoTransactionBody) Outputs() []TransactionOutput {
 	return ret
 }
 
+func (b *AlonzoTransactionBody) ProtocolParametersUpdate() map[Blake2b224]any {
+	updateMap := make(map[Blake2b224]any)
+	for k, v := range b.Update.ProtocolParamUpdates {
+		updateMap[k] = v
+	}
+	return updateMap
+}
+
 func (b *AlonzoTransactionBody) Collateral() []TransactionInput {
 	ret := []TransactionInput{}
 	for _, collateral := range b.TxCollateral {
@@ -289,6 +297,10 @@ func (t AlonzoTransaction) ValidityIntervalStart() uint64 {
 	return t.Body.ValidityIntervalStart()
 }
 
+func (t AlonzoTransaction) ProtocolParametersUpdate() map[Blake2b224]any {
+	return t.Body.ProtocolParametersUpdate()
+}
+
 func (t AlonzoTransaction) ReferenceInputs() []TransactionInput {
 	return t.Body.ReferenceInputs()
 }
@@ -370,14 +382,6 @@ func (t AlonzoTransaction) Produced() []TransactionOutput {
 	}
 }
 
-func (t *AlonzoTransaction) ProtocolParametersUpdate() map[Blake2b224]any {
-	updateMap := make(map[Blake2b224]any)
-	for k, v := range t.Body.Update.ProtocolParamUpdates {
-		updateMap[k] = v
-	}
-	return updateMap
-}
-
 func (t *AlonzoTransaction) Cbor() []byte {
 	// Return stored CBOR if we have any
 	cborData := t.DecodeStoreCbor.Cbor()
diff --git a/ledger/babbage.go b/ledger/babbage.go
index ee659aa7..9d04f9e0 100644
--- a/ledger/babbage.go
+++ b/ledger/babbage.go
@@ -199,6 +199,14 @@ func (b *BabbageTransactionBody) Outputs() []TransactionOutput {
 	return ret
 }
 
+func (b *BabbageTransactionBody) ProtocolParametersUpdate() map[Blake2b224]any {
+	updateMap := make(map[Blake2b224]any)
+	for k, v := range b.Update.ProtocolParamUpdates {
+		updateMap[k] = v
+	}
+	return updateMap
+}
+
 func (b *BabbageTransactionBody) ReferenceInputs() []TransactionInput {
 	ret := []TransactionInput{}
 	for _, input := range b.TxReferenceInputs {
@@ -455,6 +463,10 @@ func (t BabbageTransaction) ValidityIntervalStart() uint64 {
 	return t.Body.ValidityIntervalStart()
 }
 
+func (t BabbageTransaction) ProtocolParametersUpdate() map[Blake2b224]any {
+	return t.Body.ProtocolParametersUpdate()
+}
+
 func (t BabbageTransaction) ReferenceInputs() []TransactionInput {
 	return t.Body.ReferenceInputs()
 }
@@ -538,14 +550,6 @@ func (t BabbageTransaction) Produced() []TransactionOutput {
 	}
 }
 
-func (t *BabbageTransaction) ProtocolParametersUpdate() map[Blake2b224]any {
-	updateMap := make(map[Blake2b224]any)
-	for k, v := range t.Body.Update.ProtocolParamUpdates {
-		updateMap[k] = v
-	}
-	return updateMap
-}
-
 func (t *BabbageTransaction) Cbor() []byte {
 	// Return stored CBOR if we have any
 	cborData := t.DecodeStoreCbor.Cbor()
diff --git a/ledger/conway.go b/ledger/conway.go
index 6bc180e1..badecf0c 100644
--- a/ledger/conway.go
+++ b/ledger/conway.go
@@ -131,6 +131,14 @@ func (b *ConwayTransactionBody) UnmarshalCBOR(cborData []byte) error {
 	return b.UnmarshalCbor(cborData, b)
 }
 
+func (b *ConwayTransactionBody) ProtocolParametersUpdate() map[Blake2b224]any {
+	updateMap := make(map[Blake2b224]any)
+	for k, v := range b.Update.ProtocolParamUpdates {
+		updateMap[k] = v
+	}
+	return updateMap
+}
+
 func (b *ConwayTransactionBody) VotingProcedures() VotingProcedures {
 	return b.TxVotingProcedures
 }
@@ -357,6 +365,10 @@ func (t ConwayTransaction) ValidityIntervalStart() uint64 {
 	return t.Body.ValidityIntervalStart()
 }
 
+func (t ConwayTransaction) ProtocolParametersUpdate() map[Blake2b224]any {
+	return t.Body.ProtocolParametersUpdate()
+}
+
 func (t ConwayTransaction) ReferenceInputs() []TransactionInput {
 	return t.Body.ReferenceInputs()
 }
@@ -440,14 +452,6 @@ func (t ConwayTransaction) Produced() []TransactionOutput {
 	}
 }
 
-func (t *ConwayTransaction) ProtocolParametersUpdate() map[Blake2b224]any {
-	updateMap := make(map[Blake2b224]any)
-	for k, v := range t.Body.Update.ProtocolParamUpdates {
-		updateMap[k] = v
-	}
-	return updateMap
-}
-
 func (t *ConwayTransaction) Cbor() []byte {
 	// Return stored CBOR if we have any
 	cborData := t.DecodeStoreCbor.Cbor()
diff --git a/ledger/mary.go b/ledger/mary.go
index 85938b7b..02c8b548 100644
--- a/ledger/mary.go
+++ b/ledger/mary.go
@@ -137,6 +137,14 @@ func (b *MaryTransactionBody) Outputs() []TransactionOutput {
 	return ret
 }
 
+func (b *MaryTransactionBody) ProtocolParametersUpdate() map[Blake2b224]any {
+	updateMap := make(map[Blake2b224]any)
+	for k, v := range b.Update.ProtocolParamUpdates {
+		updateMap[k] = v
+	}
+	return updateMap
+}
+
 func (b *MaryTransactionBody) AssetMint() *MultiAsset[MultiAssetTypeMint] {
 	return b.TxMint
 }
@@ -179,6 +187,10 @@ func (t MaryTransaction) ValidityIntervalStart() uint64 {
 	return t.Body.ValidityIntervalStart()
 }
 
+func (t MaryTransaction) ProtocolParametersUpdate() map[Blake2b224]any {
+	return t.Body.ProtocolParametersUpdate()
+}
+
 func (t MaryTransaction) ReferenceInputs() []TransactionInput {
 	return t.Body.ReferenceInputs()
 }
@@ -251,14 +263,6 @@ func (t MaryTransaction) Produced() []TransactionOutput {
 	return t.Outputs()
 }
 
-func (t *MaryTransaction) ProtocolParametersUpdate() map[Blake2b224]any {
-	updateMap := make(map[Blake2b224]any)
-	for k, v := range t.Body.Update.ProtocolParamUpdates {
-		updateMap[k] = v
-	}
-	return updateMap
-}
-
 func (t *MaryTransaction) Cbor() []byte {
 	// Return stored CBOR if we have any
 	cborData := t.DecodeStoreCbor.Cbor()
diff --git a/ledger/shelley.go b/ledger/shelley.go
index 6e33933f..291124b8 100644
--- a/ledger/shelley.go
+++ b/ledger/shelley.go
@@ -218,6 +218,14 @@ func (b *ShelleyTransactionBody) ValidityIntervalStart() uint64 {
 	return 0
 }
 
+func (b *ShelleyTransactionBody) ProtocolParametersUpdate() map[Blake2b224]any {
+	updateMap := make(map[Blake2b224]any)
+	for k, v := range b.Update.ProtocolParamUpdates {
+		updateMap[k] = v
+	}
+	return updateMap
+}
+
 func (b *ShelleyTransactionBody) ReferenceInputs() []TransactionInput {
 	return []TransactionInput{}
 }
@@ -503,11 +511,7 @@ func (t ShelleyTransaction) Utxorpc() *utxorpc.Tx {
 }
 
 func (t *ShelleyTransaction) ProtocolParametersUpdate() map[Blake2b224]any {
-	updateMap := make(map[Blake2b224]any)
-	for k, v := range t.Body.Update.ProtocolParamUpdates {
-		updateMap[k] = v
-	}
-	return updateMap
+	return t.Body.ProtocolParametersUpdate()
 }
 
 func (t *ShelleyTransaction) Cbor() []byte {
diff --git a/ledger/tx.go b/ledger/tx.go
index 77fbeebc..8c4eef50 100644
--- a/ledger/tx.go
+++ b/ledger/tx.go
@@ -30,7 +30,6 @@ type Transaction interface {
 	IsValid() bool
 	Consumed() []TransactionInput
 	Produced() []TransactionOutput
-	ProtocolParametersUpdate() map[Blake2b224]any
 }
 
 type TransactionBody interface {
@@ -40,6 +39,7 @@ type TransactionBody interface {
 	Inputs() []TransactionInput
 	Outputs() []TransactionOutput
 	TTL() uint64
+	ProtocolParametersUpdate() map[Blake2b224]any
 	ValidityIntervalStart() uint64
 	ReferenceInputs() []TransactionInput
 	Collateral() []TransactionInput