diff --git a/gointerfaces/remote/ethbackend.pb.go b/gointerfaces/remote/ethbackend.pb.go
index d7fed5cfb..1eea8b868 100644
--- a/gointerfaces/remote/ethbackend.pb.go
+++ b/gointerfaces/remote/ethbackend.pb.go
@@ -71,6 +71,64 @@ func (Event) EnumDescriptor() ([]byte, []int) {
 	return file_remote_ethbackend_proto_rawDescGZIP(), []int{0}
 }
 
+type EngineStatus int32
+
+const (
+	EngineStatus_VALID                  EngineStatus = 0
+	EngineStatus_INVALID                EngineStatus = 1
+	EngineStatus_SYNCING                EngineStatus = 2
+	EngineStatus_ACCEPTED               EngineStatus = 3
+	EngineStatus_INVALID_BLOCK_HASH     EngineStatus = 4
+	EngineStatus_INVALID_TERMINAL_BLOCK EngineStatus = 5
+)
+
+// Enum value maps for EngineStatus.
+var (
+	EngineStatus_name = map[int32]string{
+		0: "VALID",
+		1: "INVALID",
+		2: "SYNCING",
+		3: "ACCEPTED",
+		4: "INVALID_BLOCK_HASH",
+		5: "INVALID_TERMINAL_BLOCK",
+	}
+	EngineStatus_value = map[string]int32{
+		"VALID":                  0,
+		"INVALID":                1,
+		"SYNCING":                2,
+		"ACCEPTED":               3,
+		"INVALID_BLOCK_HASH":     4,
+		"INVALID_TERMINAL_BLOCK": 5,
+	}
+)
+
+func (x EngineStatus) Enum() *EngineStatus {
+	p := new(EngineStatus)
+	*p = x
+	return p
+}
+
+func (x EngineStatus) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (EngineStatus) Descriptor() protoreflect.EnumDescriptor {
+	return file_remote_ethbackend_proto_enumTypes[1].Descriptor()
+}
+
+func (EngineStatus) Type() protoreflect.EnumType {
+	return &file_remote_ethbackend_proto_enumTypes[1]
+}
+
+func (x EngineStatus) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use EngineStatus.Descriptor instead.
+func (EngineStatus) EnumDescriptor() ([]byte, []int) {
+	return file_remote_ethbackend_proto_rawDescGZIP(), []int{1}
+}
+
 type EtherbaseRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -373,17 +431,18 @@ func (x *EngineGetPayloadRequest) GetPayloadId() uint64 {
 	return 0
 }
 
-type EngineExecutePayloadReply struct {
+type EnginePayloadStatus struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Status          string      `protobuf:"bytes,1,opt,name=status,proto3" json:"status,omitempty"`
-	LatestValidHash *types.H256 `protobuf:"bytes,2,opt,name=latestValidHash,proto3" json:"latestValidHash,omitempty"`
+	Status          EngineStatus `protobuf:"varint,1,opt,name=status,proto3,enum=remote.EngineStatus" json:"status,omitempty"`
+	LatestValidHash *types.H256  `protobuf:"bytes,2,opt,name=latestValidHash,proto3" json:"latestValidHash,omitempty"`
+	ValidationError string       `protobuf:"bytes,3,opt,name=validationError,proto3" json:"validationError,omitempty"`
 }
 
-func (x *EngineExecutePayloadReply) Reset() {
-	*x = EngineExecutePayloadReply{}
+func (x *EnginePayloadStatus) Reset() {
+	*x = EnginePayloadStatus{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_remote_ethbackend_proto_msgTypes[7]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -391,13 +450,13 @@ func (x *EngineExecutePayloadReply) Reset() {
 	}
 }
 
-func (x *EngineExecutePayloadReply) String() string {
+func (x *EnginePayloadStatus) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*EngineExecutePayloadReply) ProtoMessage() {}
+func (*EnginePayloadStatus) ProtoMessage() {}
 
-func (x *EngineExecutePayloadReply) ProtoReflect() protoreflect.Message {
+func (x *EnginePayloadStatus) ProtoReflect() protoreflect.Message {
 	mi := &file_remote_ethbackend_proto_msgTypes[7]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -409,37 +468,44 @@ func (x *EngineExecutePayloadReply) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use EngineExecutePayloadReply.ProtoReflect.Descriptor instead.
-func (*EngineExecutePayloadReply) Descriptor() ([]byte, []int) {
+// Deprecated: Use EnginePayloadStatus.ProtoReflect.Descriptor instead.
+func (*EnginePayloadStatus) Descriptor() ([]byte, []int) {
 	return file_remote_ethbackend_proto_rawDescGZIP(), []int{7}
 }
 
-func (x *EngineExecutePayloadReply) GetStatus() string {
+func (x *EnginePayloadStatus) GetStatus() EngineStatus {
 	if x != nil {
 		return x.Status
 	}
-	return ""
+	return EngineStatus_VALID
 }
 
-func (x *EngineExecutePayloadReply) GetLatestValidHash() *types.H256 {
+func (x *EnginePayloadStatus) GetLatestValidHash() *types.H256 {
 	if x != nil {
 		return x.LatestValidHash
 	}
 	return nil
 }
 
-type EnginePreparePayload struct {
+func (x *EnginePayloadStatus) GetValidationError() string {
+	if x != nil {
+		return x.ValidationError
+	}
+	return ""
+}
+
+type EnginePayloadAttributes struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Timestamp    uint64      `protobuf:"varint,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
-	Random       *types.H256 `protobuf:"bytes,2,opt,name=random,proto3" json:"random,omitempty"`
-	FeeRecipient *types.H160 `protobuf:"bytes,3,opt,name=feeRecipient,proto3" json:"feeRecipient,omitempty"`
+	Timestamp             uint64      `protobuf:"varint,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+	Random                *types.H256 `protobuf:"bytes,2,opt,name=random,proto3" json:"random,omitempty"`
+	SuggestedFeeRecipient *types.H160 `protobuf:"bytes,3,opt,name=suggestedFeeRecipient,proto3" json:"suggestedFeeRecipient,omitempty"`
 }
 
-func (x *EnginePreparePayload) Reset() {
-	*x = EnginePreparePayload{}
+func (x *EnginePayloadAttributes) Reset() {
+	*x = EnginePayloadAttributes{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_remote_ethbackend_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -447,13 +513,13 @@ func (x *EnginePreparePayload) Reset() {
 	}
 }
 
-func (x *EnginePreparePayload) String() string {
+func (x *EnginePayloadAttributes) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*EnginePreparePayload) ProtoMessage() {}
+func (*EnginePayloadAttributes) ProtoMessage() {}
 
-func (x *EnginePreparePayload) ProtoReflect() protoreflect.Message {
+func (x *EnginePayloadAttributes) ProtoReflect() protoreflect.Message {
 	mi := &file_remote_ethbackend_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -465,33 +531,33 @@ func (x *EnginePreparePayload) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use EnginePreparePayload.ProtoReflect.Descriptor instead.
-func (*EnginePreparePayload) Descriptor() ([]byte, []int) {
+// Deprecated: Use EnginePayloadAttributes.ProtoReflect.Descriptor instead.
+func (*EnginePayloadAttributes) Descriptor() ([]byte, []int) {
 	return file_remote_ethbackend_proto_rawDescGZIP(), []int{8}
 }
 
-func (x *EnginePreparePayload) GetTimestamp() uint64 {
+func (x *EnginePayloadAttributes) GetTimestamp() uint64 {
 	if x != nil {
 		return x.Timestamp
 	}
 	return 0
 }
 
-func (x *EnginePreparePayload) GetRandom() *types.H256 {
+func (x *EnginePayloadAttributes) GetRandom() *types.H256 {
 	if x != nil {
 		return x.Random
 	}
 	return nil
 }
 
-func (x *EnginePreparePayload) GetFeeRecipient() *types.H160 {
+func (x *EnginePayloadAttributes) GetSuggestedFeeRecipient() *types.H160 {
 	if x != nil {
-		return x.FeeRecipient
+		return x.SuggestedFeeRecipient
 	}
 	return nil
 }
 
-type EngineForkChoiceUpdated struct {
+type EngineForkChoiceState struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
@@ -501,8 +567,8 @@ type EngineForkChoiceUpdated struct {
 	FinalizedBlockHash *types.H256 `protobuf:"bytes,3,opt,name=finalizedBlockHash,proto3" json:"finalizedBlockHash,omitempty"`
 }
 
-func (x *EngineForkChoiceUpdated) Reset() {
-	*x = EngineForkChoiceUpdated{}
+func (x *EngineForkChoiceState) Reset() {
+	*x = EngineForkChoiceState{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_remote_ethbackend_proto_msgTypes[9]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -510,13 +576,13 @@ func (x *EngineForkChoiceUpdated) Reset() {
 	}
 }
 
-func (x *EngineForkChoiceUpdated) String() string {
+func (x *EngineForkChoiceState) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*EngineForkChoiceUpdated) ProtoMessage() {}
+func (*EngineForkChoiceState) ProtoMessage() {}
 
-func (x *EngineForkChoiceUpdated) ProtoReflect() protoreflect.Message {
+func (x *EngineForkChoiceState) ProtoReflect() protoreflect.Message {
 	mi := &file_remote_ethbackend_proto_msgTypes[9]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -528,26 +594,26 @@ func (x *EngineForkChoiceUpdated) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use EngineForkChoiceUpdated.ProtoReflect.Descriptor instead.
-func (*EngineForkChoiceUpdated) Descriptor() ([]byte, []int) {
+// Deprecated: Use EngineForkChoiceState.ProtoReflect.Descriptor instead.
+func (*EngineForkChoiceState) Descriptor() ([]byte, []int) {
 	return file_remote_ethbackend_proto_rawDescGZIP(), []int{9}
 }
 
-func (x *EngineForkChoiceUpdated) GetHeadBlockHash() *types.H256 {
+func (x *EngineForkChoiceState) GetHeadBlockHash() *types.H256 {
 	if x != nil {
 		return x.HeadBlockHash
 	}
 	return nil
 }
 
-func (x *EngineForkChoiceUpdated) GetSafeBlockHash() *types.H256 {
+func (x *EngineForkChoiceState) GetSafeBlockHash() *types.H256 {
 	if x != nil {
 		return x.SafeBlockHash
 	}
 	return nil
 }
 
-func (x *EngineForkChoiceUpdated) GetFinalizedBlockHash() *types.H256 {
+func (x *EngineForkChoiceState) GetFinalizedBlockHash() *types.H256 {
 	if x != nil {
 		return x.FinalizedBlockHash
 	}
@@ -559,8 +625,8 @@ type EngineForkChoiceUpdatedRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Forkchoice *EngineForkChoiceUpdated `protobuf:"bytes,1,opt,name=forkchoice,proto3" json:"forkchoice,omitempty"`
-	Prepare    *EnginePreparePayload    `protobuf:"bytes,2,opt,name=prepare,proto3" json:"prepare,omitempty"`
+	ForkchoiceState   *EngineForkChoiceState   `protobuf:"bytes,1,opt,name=forkchoiceState,proto3" json:"forkchoiceState,omitempty"`
+	PayloadAttributes *EnginePayloadAttributes `protobuf:"bytes,2,opt,name=payloadAttributes,proto3" json:"payloadAttributes,omitempty"`
 }
 
 func (x *EngineForkChoiceUpdatedRequest) Reset() {
@@ -595,16 +661,16 @@ func (*EngineForkChoiceUpdatedRequest) Descriptor() ([]byte, []int) {
 	return file_remote_ethbackend_proto_rawDescGZIP(), []int{10}
 }
 
-func (x *EngineForkChoiceUpdatedRequest) GetForkchoice() *EngineForkChoiceUpdated {
+func (x *EngineForkChoiceUpdatedRequest) GetForkchoiceState() *EngineForkChoiceState {
 	if x != nil {
-		return x.Forkchoice
+		return x.ForkchoiceState
 	}
 	return nil
 }
 
-func (x *EngineForkChoiceUpdatedRequest) GetPrepare() *EnginePreparePayload {
+func (x *EngineForkChoiceUpdatedRequest) GetPayloadAttributes() *EnginePayloadAttributes {
 	if x != nil {
-		return x.Prepare
+		return x.PayloadAttributes
 	}
 	return nil
 }
@@ -614,8 +680,8 @@ type EngineForkChoiceUpdatedReply struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Status    string `protobuf:"bytes,1,opt,name=status,proto3" json:"status,omitempty"`
-	PayloadId uint64 `protobuf:"varint,2,opt,name=payloadId,proto3" json:"payloadId,omitempty"`
+	PayloadStatus *EnginePayloadStatus `protobuf:"bytes,1,opt,name=payloadStatus,proto3" json:"payloadStatus,omitempty"`
+	PayloadId     uint64               `protobuf:"varint,2,opt,name=payloadId,proto3" json:"payloadId,omitempty"`
 }
 
 func (x *EngineForkChoiceUpdatedReply) Reset() {
@@ -650,11 +716,11 @@ func (*EngineForkChoiceUpdatedReply) Descriptor() ([]byte, []int) {
 	return file_remote_ethbackend_proto_rawDescGZIP(), []int{11}
 }
 
-func (x *EngineForkChoiceUpdatedReply) GetStatus() string {
+func (x *EngineForkChoiceUpdatedReply) GetPayloadStatus() *EnginePayloadStatus {
 	if x != nil {
-		return x.Status
+		return x.PayloadStatus
 	}
-	return ""
+	return nil
 }
 
 func (x *EngineForkChoiceUpdatedReply) GetPayloadId() uint64 {
@@ -1258,154 +1324,170 @@ var file_remote_ethbackend_proto_rawDesc = []byte{
 	0x6e, 0x65, 0x47, 0x65, 0x74, 0x50, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64, 0x52, 0x65, 0x71, 0x75,
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 }
 
 var (
@@ -1420,87 +1502,90 @@ func file_remote_ethbackend_proto_rawDescGZIP() []byte {
 	return file_remote_ethbackend_proto_rawDescData
 }
 
-var file_remote_ethbackend_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_remote_ethbackend_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
 var file_remote_ethbackend_proto_msgTypes = make([]protoimpl.MessageInfo, 24)
 var file_remote_ethbackend_proto_goTypes = []interface{}{
 	(Event)(0),                             // 0: remote.Event
-	(*EtherbaseRequest)(nil),               // 1: remote.EtherbaseRequest
-	(*EtherbaseReply)(nil),                 // 2: remote.EtherbaseReply
-	(*NetVersionRequest)(nil),              // 3: remote.NetVersionRequest
-	(*NetVersionReply)(nil),                // 4: remote.NetVersionReply
-	(*NetPeerCountRequest)(nil),            // 5: remote.NetPeerCountRequest
-	(*NetPeerCountReply)(nil),              // 6: remote.NetPeerCountReply
-	(*EngineGetPayloadRequest)(nil),        // 7: remote.EngineGetPayloadRequest
-	(*EngineExecutePayloadReply)(nil),      // 8: remote.EngineExecutePayloadReply
-	(*EnginePreparePayload)(nil),           // 9: remote.EnginePreparePayload
-	(*EngineForkChoiceUpdated)(nil),        // 10: remote.EngineForkChoiceUpdated
-	(*EngineForkChoiceUpdatedRequest)(nil), // 11: remote.EngineForkChoiceUpdatedRequest
-	(*EngineForkChoiceUpdatedReply)(nil),   // 12: remote.EngineForkChoiceUpdatedReply
-	(*ProtocolVersionRequest)(nil),         // 13: remote.ProtocolVersionRequest
-	(*ProtocolVersionReply)(nil),           // 14: remote.ProtocolVersionReply
-	(*ClientVersionRequest)(nil),           // 15: remote.ClientVersionRequest
-	(*ClientVersionReply)(nil),             // 16: remote.ClientVersionReply
-	(*SubscribeRequest)(nil),               // 17: remote.SubscribeRequest
-	(*SubscribeReply)(nil),                 // 18: remote.SubscribeReply
-	(*BlockRequest)(nil),                   // 19: remote.BlockRequest
-	(*BlockReply)(nil),                     // 20: remote.BlockReply
-	(*TxnLookupRequest)(nil),               // 21: remote.TxnLookupRequest
-	(*TxnLookupReply)(nil),                 // 22: remote.TxnLookupReply
-	(*NodesInfoRequest)(nil),               // 23: remote.NodesInfoRequest
-	(*NodesInfoReply)(nil),                 // 24: remote.NodesInfoReply
-	(*types.H160)(nil),                     // 25: types.H160
-	(*types.H256)(nil),                     // 26: types.H256
-	(*types.NodeInfoReply)(nil),            // 27: types.NodeInfoReply
-	(*types.ExecutionPayload)(nil),         // 28: types.ExecutionPayload
-	(*emptypb.Empty)(nil),                  // 29: google.protobuf.Empty
-	(*types.VersionReply)(nil),             // 30: types.VersionReply
+	(EngineStatus)(0),                      // 1: remote.EngineStatus
+	(*EtherbaseRequest)(nil),               // 2: remote.EtherbaseRequest
+	(*EtherbaseReply)(nil),                 // 3: remote.EtherbaseReply
+	(*NetVersionRequest)(nil),              // 4: remote.NetVersionRequest
+	(*NetVersionReply)(nil),                // 5: remote.NetVersionReply
+	(*NetPeerCountRequest)(nil),            // 6: remote.NetPeerCountRequest
+	(*NetPeerCountReply)(nil),              // 7: remote.NetPeerCountReply
+	(*EngineGetPayloadRequest)(nil),        // 8: remote.EngineGetPayloadRequest
+	(*EnginePayloadStatus)(nil),            // 9: remote.EnginePayloadStatus
+	(*EnginePayloadAttributes)(nil),        // 10: remote.EnginePayloadAttributes
+	(*EngineForkChoiceState)(nil),          // 11: remote.EngineForkChoiceState
+	(*EngineForkChoiceUpdatedRequest)(nil), // 12: remote.EngineForkChoiceUpdatedRequest
+	(*EngineForkChoiceUpdatedReply)(nil),   // 13: remote.EngineForkChoiceUpdatedReply
+	(*ProtocolVersionRequest)(nil),         // 14: remote.ProtocolVersionRequest
+	(*ProtocolVersionReply)(nil),           // 15: remote.ProtocolVersionReply
+	(*ClientVersionRequest)(nil),           // 16: remote.ClientVersionRequest
+	(*ClientVersionReply)(nil),             // 17: remote.ClientVersionReply
+	(*SubscribeRequest)(nil),               // 18: remote.SubscribeRequest
+	(*SubscribeReply)(nil),                 // 19: remote.SubscribeReply
+	(*BlockRequest)(nil),                   // 20: remote.BlockRequest
+	(*BlockReply)(nil),                     // 21: remote.BlockReply
+	(*TxnLookupRequest)(nil),               // 22: remote.TxnLookupRequest
+	(*TxnLookupReply)(nil),                 // 23: remote.TxnLookupReply
+	(*NodesInfoRequest)(nil),               // 24: remote.NodesInfoRequest
+	(*NodesInfoReply)(nil),                 // 25: remote.NodesInfoReply
+	(*types.H160)(nil),                     // 26: types.H160
+	(*types.H256)(nil),                     // 27: types.H256
+	(*types.NodeInfoReply)(nil),            // 28: types.NodeInfoReply
+	(*types.ExecutionPayload)(nil),         // 29: types.ExecutionPayload
+	(*emptypb.Empty)(nil),                  // 30: google.protobuf.Empty
+	(*types.VersionReply)(nil),             // 31: types.VersionReply
 }
 var file_remote_ethbackend_proto_depIdxs = []int32{
-	25, // 0: remote.EtherbaseReply.address:type_name -> types.H160
-	26, // 1: remote.EngineExecutePayloadReply.latestValidHash:type_name -> types.H256
-	26, // 2: remote.EnginePreparePayload.random:type_name -> types.H256
-	25, // 3: remote.EnginePreparePayload.feeRecipient:type_name -> types.H160
-	26, // 4: remote.EngineForkChoiceUpdated.headBlockHash:type_name -> types.H256
-	26, // 5: remote.EngineForkChoiceUpdated.safeBlockHash:type_name -> types.H256
-	26, // 6: remote.EngineForkChoiceUpdated.finalizedBlockHash:type_name -> types.H256
-	10, // 7: remote.EngineForkChoiceUpdatedRequest.forkchoice:type_name -> remote.EngineForkChoiceUpdated
-	9,  // 8: remote.EngineForkChoiceUpdatedRequest.prepare:type_name -> remote.EnginePreparePayload
-	0,  // 9: remote.SubscribeRequest.type:type_name -> remote.Event
-	0,  // 10: remote.SubscribeReply.type:type_name -> remote.Event
-	26, // 11: remote.BlockRequest.blockHash:type_name -> types.H256
-	26, // 12: remote.TxnLookupRequest.txnHash:type_name -> types.H256
-	27, // 13: remote.NodesInfoReply.nodesInfo:type_name -> types.NodeInfoReply
-	1,  // 14: remote.ETHBACKEND.Etherbase:input_type -> remote.EtherbaseRequest
-	3,  // 15: remote.ETHBACKEND.NetVersion:input_type -> remote.NetVersionRequest
-	5,  // 16: remote.ETHBACKEND.NetPeerCount:input_type -> remote.NetPeerCountRequest
-	7,  // 17: remote.ETHBACKEND.EngineGetPayloadV1:input_type -> remote.EngineGetPayloadRequest
-	28, // 18: remote.ETHBACKEND.EngineExecutePayloadV1:input_type -> types.ExecutionPayload
-	11, // 19: remote.ETHBACKEND.EngineForkChoiceUpdatedV1:input_type -> remote.EngineForkChoiceUpdatedRequest
-	29, // 20: remote.ETHBACKEND.Version:input_type -> google.protobuf.Empty
-	13, // 21: remote.ETHBACKEND.ProtocolVersion:input_type -> remote.ProtocolVersionRequest
-	15, // 22: remote.ETHBACKEND.ClientVersion:input_type -> remote.ClientVersionRequest
-	17, // 23: remote.ETHBACKEND.Subscribe:input_type -> remote.SubscribeRequest
-	19, // 24: remote.ETHBACKEND.Block:input_type -> remote.BlockRequest
-	21, // 25: remote.ETHBACKEND.TxnLookup:input_type -> remote.TxnLookupRequest
-	23, // 26: remote.ETHBACKEND.NodeInfo:input_type -> remote.NodesInfoRequest
-	2,  // 27: remote.ETHBACKEND.Etherbase:output_type -> remote.EtherbaseReply
-	4,  // 28: remote.ETHBACKEND.NetVersion:output_type -> remote.NetVersionReply
-	6,  // 29: remote.ETHBACKEND.NetPeerCount:output_type -> remote.NetPeerCountReply
-	28, // 30: remote.ETHBACKEND.EngineGetPayloadV1:output_type -> types.ExecutionPayload
-	8,  // 31: remote.ETHBACKEND.EngineExecutePayloadV1:output_type -> remote.EngineExecutePayloadReply
-	12, // 32: remote.ETHBACKEND.EngineForkChoiceUpdatedV1:output_type -> remote.EngineForkChoiceUpdatedReply
-	30, // 33: remote.ETHBACKEND.Version:output_type -> types.VersionReply
-	14, // 34: remote.ETHBACKEND.ProtocolVersion:output_type -> remote.ProtocolVersionReply
-	16, // 35: remote.ETHBACKEND.ClientVersion:output_type -> remote.ClientVersionReply
-	18, // 36: remote.ETHBACKEND.Subscribe:output_type -> remote.SubscribeReply
-	20, // 37: remote.ETHBACKEND.Block:output_type -> remote.BlockReply
-	22, // 38: remote.ETHBACKEND.TxnLookup:output_type -> remote.TxnLookupReply
-	24, // 39: remote.ETHBACKEND.NodeInfo:output_type -> remote.NodesInfoReply
-	27, // [27:40] is the sub-list for method output_type
-	14, // [14:27] is the sub-list for method input_type
-	14, // [14:14] is the sub-list for extension type_name
-	14, // [14:14] is the sub-list for extension extendee
-	0,  // [0:14] is the sub-list for field type_name
+	26, // 0: remote.EtherbaseReply.address:type_name -> types.H160
+	1,  // 1: remote.EnginePayloadStatus.status:type_name -> remote.EngineStatus
+	27, // 2: remote.EnginePayloadStatus.latestValidHash:type_name -> types.H256
+	27, // 3: remote.EnginePayloadAttributes.random:type_name -> types.H256
+	26, // 4: remote.EnginePayloadAttributes.suggestedFeeRecipient:type_name -> types.H160
+	27, // 5: remote.EngineForkChoiceState.headBlockHash:type_name -> types.H256
+	27, // 6: remote.EngineForkChoiceState.safeBlockHash:type_name -> types.H256
+	27, // 7: remote.EngineForkChoiceState.finalizedBlockHash:type_name -> types.H256
+	11, // 8: remote.EngineForkChoiceUpdatedRequest.forkchoiceState:type_name -> remote.EngineForkChoiceState
+	10, // 9: remote.EngineForkChoiceUpdatedRequest.payloadAttributes:type_name -> remote.EnginePayloadAttributes
+	9,  // 10: remote.EngineForkChoiceUpdatedReply.payloadStatus:type_name -> remote.EnginePayloadStatus
+	0,  // 11: remote.SubscribeRequest.type:type_name -> remote.Event
+	0,  // 12: remote.SubscribeReply.type:type_name -> remote.Event
+	27, // 13: remote.BlockRequest.blockHash:type_name -> types.H256
+	27, // 14: remote.TxnLookupRequest.txnHash:type_name -> types.H256
+	28, // 15: remote.NodesInfoReply.nodesInfo:type_name -> types.NodeInfoReply
+	2,  // 16: remote.ETHBACKEND.Etherbase:input_type -> remote.EtherbaseRequest
+	4,  // 17: remote.ETHBACKEND.NetVersion:input_type -> remote.NetVersionRequest
+	6,  // 18: remote.ETHBACKEND.NetPeerCount:input_type -> remote.NetPeerCountRequest
+	8,  // 19: remote.ETHBACKEND.EngineGetPayloadV1:input_type -> remote.EngineGetPayloadRequest
+	29, // 20: remote.ETHBACKEND.EngineNewPayloadV1:input_type -> types.ExecutionPayload
+	12, // 21: remote.ETHBACKEND.EngineForkChoiceUpdatedV1:input_type -> remote.EngineForkChoiceUpdatedRequest
+	30, // 22: remote.ETHBACKEND.Version:input_type -> google.protobuf.Empty
+	14, // 23: remote.ETHBACKEND.ProtocolVersion:input_type -> remote.ProtocolVersionRequest
+	16, // 24: remote.ETHBACKEND.ClientVersion:input_type -> remote.ClientVersionRequest
+	18, // 25: remote.ETHBACKEND.Subscribe:input_type -> remote.SubscribeRequest
+	20, // 26: remote.ETHBACKEND.Block:input_type -> remote.BlockRequest
+	22, // 27: remote.ETHBACKEND.TxnLookup:input_type -> remote.TxnLookupRequest
+	24, // 28: remote.ETHBACKEND.NodeInfo:input_type -> remote.NodesInfoRequest
+	3,  // 29: remote.ETHBACKEND.Etherbase:output_type -> remote.EtherbaseReply
+	5,  // 30: remote.ETHBACKEND.NetVersion:output_type -> remote.NetVersionReply
+	7,  // 31: remote.ETHBACKEND.NetPeerCount:output_type -> remote.NetPeerCountReply
+	29, // 32: remote.ETHBACKEND.EngineGetPayloadV1:output_type -> types.ExecutionPayload
+	9,  // 33: remote.ETHBACKEND.EngineNewPayloadV1:output_type -> remote.EnginePayloadStatus
+	13, // 34: remote.ETHBACKEND.EngineForkChoiceUpdatedV1:output_type -> remote.EngineForkChoiceUpdatedReply
+	31, // 35: remote.ETHBACKEND.Version:output_type -> types.VersionReply
+	15, // 36: remote.ETHBACKEND.ProtocolVersion:output_type -> remote.ProtocolVersionReply
+	17, // 37: remote.ETHBACKEND.ClientVersion:output_type -> remote.ClientVersionReply
+	19, // 38: remote.ETHBACKEND.Subscribe:output_type -> remote.SubscribeReply
+	21, // 39: remote.ETHBACKEND.Block:output_type -> remote.BlockReply
+	23, // 40: remote.ETHBACKEND.TxnLookup:output_type -> remote.TxnLookupReply
+	25, // 41: remote.ETHBACKEND.NodeInfo:output_type -> remote.NodesInfoReply
+	29, // [29:42] is the sub-list for method output_type
+	16, // [16:29] is the sub-list for method input_type
+	16, // [16:16] is the sub-list for extension type_name
+	16, // [16:16] is the sub-list for extension extendee
+	0,  // [0:16] is the sub-list for field type_name
 }
 
 func init() { file_remote_ethbackend_proto_init() }
@@ -1594,7 +1679,7 @@ func file_remote_ethbackend_proto_init() {
 			}
 		}
 		file_remote_ethbackend_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*EngineExecutePayloadReply); i {
+			switch v := v.(*EnginePayloadStatus); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1606,7 +1691,7 @@ func file_remote_ethbackend_proto_init() {
 			}
 		}
 		file_remote_ethbackend_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*EnginePreparePayload); i {
+			switch v := v.(*EnginePayloadAttributes); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1618,7 +1703,7 @@ func file_remote_ethbackend_proto_init() {
 			}
 		}
 		file_remote_ethbackend_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*EngineForkChoiceUpdated); i {
+			switch v := v.(*EngineForkChoiceState); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1803,7 +1888,7 @@ func file_remote_ethbackend_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_remote_ethbackend_proto_rawDesc,
-			NumEnums:      1,
+			NumEnums:      2,
 			NumMessages:   24,
 			NumExtensions: 0,
 			NumServices:   1,
diff --git a/gointerfaces/remote/ethbackend_grpc.pb.go b/gointerfaces/remote/ethbackend_grpc.pb.go
index ad5cbea78..51debbffe 100644
--- a/gointerfaces/remote/ethbackend_grpc.pb.go
+++ b/gointerfaces/remote/ethbackend_grpc.pb.go
@@ -23,10 +23,10 @@ type ETHBACKENDClient interface {
 	Etherbase(ctx context.Context, in *EtherbaseRequest, opts ...grpc.CallOption) (*EtherbaseReply, error)
 	NetVersion(ctx context.Context, in *NetVersionRequest, opts ...grpc.CallOption) (*NetVersionReply, error)
 	NetPeerCount(ctx context.Context, in *NetPeerCountRequest, opts ...grpc.CallOption) (*NetPeerCountReply, error)
-	// Fetch Execution Payload using its id.
+	// Fetch Execution Payload using its ID.
 	EngineGetPayloadV1(ctx context.Context, in *EngineGetPayloadRequest, opts ...grpc.CallOption) (*types.ExecutionPayload, error)
-	// Execute the payload.
-	EngineExecutePayloadV1(ctx context.Context, in *types.ExecutionPayload, opts ...grpc.CallOption) (*EngineExecutePayloadReply, error)
+	// Validate and possibly execute the payload.
+	EngineNewPayloadV1(ctx context.Context, in *types.ExecutionPayload, opts ...grpc.CallOption) (*EnginePayloadStatus, error)
 	// Update fork choice
 	EngineForkChoiceUpdatedV1(ctx context.Context, in *EngineForkChoiceUpdatedRequest, opts ...grpc.CallOption) (*EngineForkChoiceUpdatedReply, error)
 	// Version returns the service version number
@@ -91,9 +91,9 @@ func (c *eTHBACKENDClient) EngineGetPayloadV1(ctx context.Context, in *EngineGet
 	return out, nil
 }
 
-func (c *eTHBACKENDClient) EngineExecutePayloadV1(ctx context.Context, in *types.ExecutionPayload, opts ...grpc.CallOption) (*EngineExecutePayloadReply, error) {
-	out := new(EngineExecutePayloadReply)
-	err := c.cc.Invoke(ctx, "/remote.ETHBACKEND/EngineExecutePayloadV1", in, out, opts...)
+func (c *eTHBACKENDClient) EngineNewPayloadV1(ctx context.Context, in *types.ExecutionPayload, opts ...grpc.CallOption) (*EnginePayloadStatus, error) {
+	out := new(EnginePayloadStatus)
+	err := c.cc.Invoke(ctx, "/remote.ETHBACKEND/EngineNewPayloadV1", in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -202,10 +202,10 @@ type ETHBACKENDServer interface {
 	Etherbase(context.Context, *EtherbaseRequest) (*EtherbaseReply, error)
 	NetVersion(context.Context, *NetVersionRequest) (*NetVersionReply, error)
 	NetPeerCount(context.Context, *NetPeerCountRequest) (*NetPeerCountReply, error)
-	// Fetch Execution Payload using its id.
+	// Fetch Execution Payload using its ID.
 	EngineGetPayloadV1(context.Context, *EngineGetPayloadRequest) (*types.ExecutionPayload, error)
-	// Execute the payload.
-	EngineExecutePayloadV1(context.Context, *types.ExecutionPayload) (*EngineExecutePayloadReply, error)
+	// Validate and possibly execute the payload.
+	EngineNewPayloadV1(context.Context, *types.ExecutionPayload) (*EnginePayloadStatus, error)
 	// Update fork choice
 	EngineForkChoiceUpdatedV1(context.Context, *EngineForkChoiceUpdatedRequest) (*EngineForkChoiceUpdatedReply, error)
 	// Version returns the service version number
@@ -243,8 +243,8 @@ func (UnimplementedETHBACKENDServer) NetPeerCount(context.Context, *NetPeerCount
 func (UnimplementedETHBACKENDServer) EngineGetPayloadV1(context.Context, *EngineGetPayloadRequest) (*types.ExecutionPayload, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method EngineGetPayloadV1 not implemented")
 }
-func (UnimplementedETHBACKENDServer) EngineExecutePayloadV1(context.Context, *types.ExecutionPayload) (*EngineExecutePayloadReply, error) {
-	return nil, status.Errorf(codes.Unimplemented, "method EngineExecutePayloadV1 not implemented")
+func (UnimplementedETHBACKENDServer) EngineNewPayloadV1(context.Context, *types.ExecutionPayload) (*EnginePayloadStatus, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method EngineNewPayloadV1 not implemented")
 }
 func (UnimplementedETHBACKENDServer) EngineForkChoiceUpdatedV1(context.Context, *EngineForkChoiceUpdatedRequest) (*EngineForkChoiceUpdatedReply, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method EngineForkChoiceUpdatedV1 not implemented")
@@ -355,20 +355,20 @@ func _ETHBACKEND_EngineGetPayloadV1_Handler(srv interface{}, ctx context.Context
 	return interceptor(ctx, in, info, handler)
 }
 
-func _ETHBACKEND_EngineExecutePayloadV1_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+func _ETHBACKEND_EngineNewPayloadV1_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(types.ExecutionPayload)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
 	if interceptor == nil {
-		return srv.(ETHBACKENDServer).EngineExecutePayloadV1(ctx, in)
+		return srv.(ETHBACKENDServer).EngineNewPayloadV1(ctx, in)
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/remote.ETHBACKEND/EngineExecutePayloadV1",
+		FullMethod: "/remote.ETHBACKEND/EngineNewPayloadV1",
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(ETHBACKENDServer).EngineExecutePayloadV1(ctx, req.(*types.ExecutionPayload))
+		return srv.(ETHBACKENDServer).EngineNewPayloadV1(ctx, req.(*types.ExecutionPayload))
 	}
 	return interceptor(ctx, in, info, handler)
 }
@@ -544,8 +544,8 @@ var ETHBACKEND_ServiceDesc = grpc.ServiceDesc{
 			Handler:    _ETHBACKEND_EngineGetPayloadV1_Handler,
 		},
 		{
-			MethodName: "EngineExecutePayloadV1",
-			Handler:    _ETHBACKEND_EngineExecutePayloadV1_Handler,
+			MethodName: "EngineNewPayloadV1",
+			Handler:    _ETHBACKEND_EngineNewPayloadV1_Handler,
 		},
 		{
 			MethodName: "EngineForkChoiceUpdatedV1",
diff --git a/interfaces/Cargo.toml b/interfaces/Cargo.toml
index b85385c3f..00483b70c 100644
--- a/interfaces/Cargo.toml
+++ b/interfaces/Cargo.toml
@@ -16,7 +16,8 @@ web3 = []
 
 [dependencies]
 arrayref = "0.3"
-ethereum-types = { version = "0.12", default-features = false }
+ethereum-types = { version = "0.13", default-features = false }
+ethnum = { version = "1", default-features = false }
 once_cell = { version = "1", optional = true }
 prost = "0.9"
 serde = { version = "1", features = ["derive"], optional = true }
diff --git a/interfaces/remote/ethbackend.proto b/interfaces/remote/ethbackend.proto
index 22884380e..9787770bb 100644
--- a/interfaces/remote/ethbackend.proto
+++ b/interfaces/remote/ethbackend.proto
@@ -13,17 +13,22 @@ service ETHBACKEND {
   rpc NetVersion(NetVersionRequest) returns (NetVersionReply);
 
   rpc NetPeerCount(NetPeerCountRequest) returns (NetPeerCountReply);
-  // "The Merge" RPC Requests to be netively implemented in the Erigon Node Backend
 
-  // Fetch Execution Payload using its id.
+  // ------------------------------------------------------------------------
+  // "The Merge" RPC requests natively implemented in the Erigon node backend
+
+  // Fetch Execution Payload using its ID.
   rpc EngineGetPayloadV1(EngineGetPayloadRequest) returns (types.ExecutionPayload);
 
-  // Execute the payload.
-  rpc EngineExecutePayloadV1(types.ExecutionPayload) returns (EngineExecutePayloadReply);
+  // Validate and possibly execute the payload.
+  rpc EngineNewPayloadV1(types.ExecutionPayload) returns (EnginePayloadStatus);
 
   // Update fork choice
   rpc EngineForkChoiceUpdatedV1(EngineForkChoiceUpdatedRequest) returns (EngineForkChoiceUpdatedReply);
 
+  // End of the Merge requests
+  // ------------------------------------------------------------------------
+
   // Version returns the service version number
   rpc Version(google.protobuf.Empty) returns (types.VersionReply);
 
@@ -68,30 +73,41 @@ message NetPeerCountReply { uint64 count = 1; }
 message EngineGetPayloadRequest {
   uint64 payloadId = 1;
 }
-message EngineExecutePayloadReply {
-  string status = 1;
+
+enum EngineStatus {
+  VALID = 0;
+  INVALID = 1;
+  SYNCING = 2;
+  ACCEPTED = 3;
+  INVALID_BLOCK_HASH = 4;
+  INVALID_TERMINAL_BLOCK = 5;
+}
+
+message EnginePayloadStatus {
+  EngineStatus status = 1;
   types.H256 latestValidHash = 2;
+  string validationError = 3;
 }
 
-message EnginePreparePayload {
+message EnginePayloadAttributes {
   uint64 timestamp = 1;
   types.H256 random = 2;
-  types.H160 feeRecipient = 3;
+  types.H160 suggestedFeeRecipient = 3;
 }
 
-message EngineForkChoiceUpdated {
+message EngineForkChoiceState {
   types.H256 headBlockHash = 1;
   types.H256 safeBlockHash = 2;
   types.H256 finalizedBlockHash = 3;
 }
 
 message EngineForkChoiceUpdatedRequest {
-  EngineForkChoiceUpdated forkchoice = 1;
-  EnginePreparePayload prepare = 2;
+  EngineForkChoiceState forkchoiceState = 1;
+  EnginePayloadAttributes payloadAttributes = 2;
 }
 
 message EngineForkChoiceUpdatedReply {
-  string status = 1;
+  EnginePayloadStatus payloadStatus = 1;
   uint64 payloadId = 2;
 }
 
diff --git a/interfaces/src/lib.rs b/interfaces/src/lib.rs
index 987ab6490..7d7c7a643 100644
--- a/interfaces/src/lib.rs
+++ b/interfaces/src/lib.rs
@@ -111,6 +111,18 @@ pub mod types {
     U!(H128, ethereum_types::H128, ethereum_types::U128);
     U!(H256, ethereum_types::H256, ethereum_types::U256);
     U!(H512, ethereum_types::H512, ethereum_types::U512);
+
+    impl From<ethnum::U256> for H256 {
+        fn from(v: ethnum::U256) -> Self {
+            ethereum_types::H256(v.to_be_bytes()).into()
+        }
+    }
+
+    impl From<H256> for ethnum::U256 {
+        fn from(v: H256) -> Self {
+            ethnum::U256::from_be_bytes(ethereum_types::H256::from(v).0)
+        }
+    }
 }
 
 #[cfg(feature = "consensus")]