diff --git a/gointerfaces/remote/ethbackend.pb.go b/gointerfaces/remote/ethbackend.pb.go
index 89f23a7ae..76c8c4cc8 100644
--- a/gointerfaces/remote/ethbackend.pb.go
+++ b/gointerfaces/remote/ethbackend.pb.go
@@ -433,10 +433,9 @@ type EnginePreparePayload struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	ParentHash   *types.H256 `protobuf:"bytes,1,opt,name=parentHash,proto3" json:"parentHash,omitempty"`
-	Timestamp    uint64      `protobuf:"varint,2,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
-	Random       *types.H256 `protobuf:"bytes,3,opt,name=random,proto3" json:"random,omitempty"`
-	FeeRecipient *types.H160 `protobuf:"bytes,4,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"`
+	FeeRecipient *types.H160 `protobuf:"bytes,3,opt,name=feeRecipient,proto3" json:"feeRecipient,omitempty"`
 }
 
 func (x *EnginePreparePayload) Reset() {
@@ -471,13 +470,6 @@ func (*EnginePreparePayload) Descriptor() ([]byte, []int) {
 	return file_remote_ethbackend_proto_rawDescGZIP(), []int{8}
 }
 
-func (x *EnginePreparePayload) GetParentHash() *types.H256 {
-	if x != nil {
-		return x.ParentHash
-	}
-	return nil
-}
-
 func (x *EnginePreparePayload) GetTimestamp() uint64 {
 	if x != nil {
 		return x.Timestamp
@@ -567,8 +559,8 @@ type EngineForkChoiceUpdatedRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	HeadBlockHash *EnginePreparePayload    `protobuf:"bytes,1,opt,name=headBlockHash,proto3" json:"headBlockHash,omitempty"`
-	SafeBlockHash *EngineForkChoiceUpdated `protobuf:"bytes,2,opt,name=safeBlockHash,proto3" json:"safeBlockHash,omitempty"`
+	Forkchoice *EngineForkChoiceUpdated `protobuf:"bytes,2,opt,name=forkchoice,proto3" json:"forkchoice,omitempty"`
+	Prepare    *EnginePreparePayload    `protobuf:"bytes,1,opt,name=prepare,proto3" json:"prepare,omitempty"`
 }
 
 func (x *EngineForkChoiceUpdatedRequest) Reset() {
@@ -603,16 +595,16 @@ func (*EngineForkChoiceUpdatedRequest) Descriptor() ([]byte, []int) {
 	return file_remote_ethbackend_proto_rawDescGZIP(), []int{10}
 }
 
-func (x *EngineForkChoiceUpdatedRequest) GetHeadBlockHash() *EnginePreparePayload {
+func (x *EngineForkChoiceUpdatedRequest) GetForkchoice() *EngineForkChoiceUpdated {
 	if x != nil {
-		return x.HeadBlockHash
+		return x.Forkchoice
 	}
 	return nil
 }
 
-func (x *EngineForkChoiceUpdatedRequest) GetSafeBlockHash() *EngineForkChoiceUpdated {
+func (x *EngineForkChoiceUpdatedRequest) GetPrepare() *EnginePreparePayload {
 	if x != nil {
-		return x.SafeBlockHash
+		return x.Prepare
 	}
 	return nil
 }
@@ -1178,141 +1170,137 @@ var file_remote_ethbackend_proto_rawDesc = []byte{
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 }
 
 var (
@@ -1363,47 +1351,46 @@ var file_remote_ethbackend_proto_goTypes = []interface{}{
 var file_remote_ethbackend_proto_depIdxs = []int32{
 	23, // 0: remote.EtherbaseReply.address:type_name -> types.H160
 	24, // 1: remote.EngineExecutePayloadReply.latestValidHash:type_name -> types.H256
-	24, // 2: remote.EnginePreparePayload.parentHash:type_name -> types.H256
-	24, // 3: remote.EnginePreparePayload.random:type_name -> types.H256
-	23, // 4: remote.EnginePreparePayload.feeRecipient:type_name -> types.H160
-	24, // 5: remote.EngineForkChoiceUpdated.headBlockHash:type_name -> types.H256
-	24, // 6: remote.EngineForkChoiceUpdated.safeBlockHash:type_name -> types.H256
-	24, // 7: remote.EngineForkChoiceUpdated.finalizedBlockHash:type_name -> types.H256
-	9,  // 8: remote.EngineForkChoiceUpdatedRequest.headBlockHash:type_name -> remote.EnginePreparePayload
-	10, // 9: remote.EngineForkChoiceUpdatedRequest.safeBlockHash:type_name -> remote.EngineForkChoiceUpdated
-	0,  // 10: remote.SubscribeRequest.type:type_name -> remote.Event
-	0,  // 11: remote.SubscribeReply.type:type_name -> remote.Event
-	24, // 12: remote.BlockRequest.blockHash:type_name -> types.H256
-	25, // 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
-	26, // 18: remote.ETHBACKEND.EngineExecutePayloadV1:input_type -> types.ExecutionPayload
-	11, // 19: remote.ETHBACKEND.EngineForkChoiceUpdatedV1:input_type -> remote.EngineForkChoiceUpdatedRequest
-	27, // 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.NodeInfo:input_type -> remote.NodesInfoRequest
-	2,  // 26: remote.ETHBACKEND.Etherbase:output_type -> remote.EtherbaseReply
-	4,  // 27: remote.ETHBACKEND.NetVersion:output_type -> remote.NetVersionReply
-	6,  // 28: remote.ETHBACKEND.NetPeerCount:output_type -> remote.NetPeerCountReply
-	26, // 29: remote.ETHBACKEND.EngineGetPayloadV1:output_type -> types.ExecutionPayload
-	8,  // 30: remote.ETHBACKEND.EngineExecutePayloadV1:output_type -> remote.EngineExecutePayloadReply
-	12, // 31: remote.ETHBACKEND.EngineForkChoiceUpdatedV1:output_type -> remote.EngineForkChoiceUpdatedReply
-	28, // 32: remote.ETHBACKEND.Version:output_type -> types.VersionReply
-	14, // 33: remote.ETHBACKEND.ProtocolVersion:output_type -> remote.ProtocolVersionReply
-	16, // 34: remote.ETHBACKEND.ClientVersion:output_type -> remote.ClientVersionReply
-	18, // 35: remote.ETHBACKEND.Subscribe:output_type -> remote.SubscribeReply
-	20, // 36: remote.ETHBACKEND.Block:output_type -> remote.BlockReply
-	22, // 37: remote.ETHBACKEND.NodeInfo:output_type -> remote.NodesInfoReply
-	26, // [26:38] is the sub-list for method output_type
-	14, // [14:26] 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
+	24, // 2: remote.EnginePreparePayload.random:type_name -> types.H256
+	23, // 3: remote.EnginePreparePayload.feeRecipient:type_name -> types.H160
+	24, // 4: remote.EngineForkChoiceUpdated.headBlockHash:type_name -> types.H256
+	24, // 5: remote.EngineForkChoiceUpdated.safeBlockHash:type_name -> types.H256
+	24, // 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
+	24, // 11: remote.BlockRequest.blockHash:type_name -> types.H256
+	25, // 12: remote.NodesInfoReply.nodesInfo:type_name -> types.NodeInfoReply
+	1,  // 13: remote.ETHBACKEND.Etherbase:input_type -> remote.EtherbaseRequest
+	3,  // 14: remote.ETHBACKEND.NetVersion:input_type -> remote.NetVersionRequest
+	5,  // 15: remote.ETHBACKEND.NetPeerCount:input_type -> remote.NetPeerCountRequest
+	7,  // 16: remote.ETHBACKEND.EngineGetPayloadV1:input_type -> remote.EngineGetPayloadRequest
+	26, // 17: remote.ETHBACKEND.EngineExecutePayloadV1:input_type -> types.ExecutionPayload
+	11, // 18: remote.ETHBACKEND.EngineForkChoiceUpdatedV1:input_type -> remote.EngineForkChoiceUpdatedRequest
+	27, // 19: remote.ETHBACKEND.Version:input_type -> google.protobuf.Empty
+	13, // 20: remote.ETHBACKEND.ProtocolVersion:input_type -> remote.ProtocolVersionRequest
+	15, // 21: remote.ETHBACKEND.ClientVersion:input_type -> remote.ClientVersionRequest
+	17, // 22: remote.ETHBACKEND.Subscribe:input_type -> remote.SubscribeRequest
+	19, // 23: remote.ETHBACKEND.Block:input_type -> remote.BlockRequest
+	21, // 24: remote.ETHBACKEND.NodeInfo:input_type -> remote.NodesInfoRequest
+	2,  // 25: remote.ETHBACKEND.Etherbase:output_type -> remote.EtherbaseReply
+	4,  // 26: remote.ETHBACKEND.NetVersion:output_type -> remote.NetVersionReply
+	6,  // 27: remote.ETHBACKEND.NetPeerCount:output_type -> remote.NetPeerCountReply
+	26, // 28: remote.ETHBACKEND.EngineGetPayloadV1:output_type -> types.ExecutionPayload
+	8,  // 29: remote.ETHBACKEND.EngineExecutePayloadV1:output_type -> remote.EngineExecutePayloadReply
+	12, // 30: remote.ETHBACKEND.EngineForkChoiceUpdatedV1:output_type -> remote.EngineForkChoiceUpdatedReply
+	28, // 31: remote.ETHBACKEND.Version:output_type -> types.VersionReply
+	14, // 32: remote.ETHBACKEND.ProtocolVersion:output_type -> remote.ProtocolVersionReply
+	16, // 33: remote.ETHBACKEND.ClientVersion:output_type -> remote.ClientVersionReply
+	18, // 34: remote.ETHBACKEND.Subscribe:output_type -> remote.SubscribeReply
+	20, // 35: remote.ETHBACKEND.Block:output_type -> remote.BlockReply
+	22, // 36: remote.ETHBACKEND.NodeInfo:output_type -> remote.NodesInfoReply
+	25, // [25:37] is the sub-list for method output_type
+	13, // [13:25] is the sub-list for method input_type
+	13, // [13:13] is the sub-list for extension type_name
+	13, // [13:13] is the sub-list for extension extendee
+	0,  // [0:13] is the sub-list for field type_name
 }
 
 func init() { file_remote_ethbackend_proto_init() }
diff --git a/gointerfaces/types/types.pb.go b/gointerfaces/types/types.pb.go
index e073471df..753490064 100644
--- a/gointerfaces/types/types.pb.go
+++ b/gointerfaces/types/types.pb.go
@@ -430,7 +430,7 @@ type ExecutionPayload struct {
 	GasLimit      uint64 `protobuf:"varint,8,opt,name=gasLimit,proto3" json:"gasLimit,omitempty"`
 	GasUsed       uint64 `protobuf:"varint,9,opt,name=gasUsed,proto3" json:"gasUsed,omitempty"`
 	Timestamp     uint64 `protobuf:"varint,10,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
-	ExtraData     *H256  `protobuf:"bytes,11,opt,name=extraData,proto3" json:"extraData,omitempty"`
+	ExtraData     []byte `protobuf:"bytes,11,opt,name=extraData,proto3" json:"extraData,omitempty"`
 	BaseFeePerGas *H256  `protobuf:"bytes,12,opt,name=baseFeePerGas,proto3" json:"baseFeePerGas,omitempty"`
 	BlockHash     *H256  `protobuf:"bytes,13,opt,name=blockHash,proto3" json:"blockHash,omitempty"`
 	//
@@ -541,7 +541,7 @@ func (x *ExecutionPayload) GetTimestamp() uint64 {
 	return 0
 }
 
-func (x *ExecutionPayload) GetExtraData() *H256 {
+func (x *ExecutionPayload) GetExtraData() []byte {
 	if x != nil {
 		return x.ExtraData
 	}
@@ -790,7 +790,7 @@ var file_types_types_proto_rawDesc = []byte{
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@@ -815,52 +815,51 @@ var file_types_types_proto_rawDesc = []byte{
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 }
 
 var (
@@ -905,18 +904,17 @@ var file_types_types_proto_depIdxs = []int32{
 	2,  // 12: types.ExecutionPayload.receiptRoot:type_name -> types.H256
 	5,  // 13: types.ExecutionPayload.logsBloom:type_name -> types.H2048
 	2,  // 14: types.ExecutionPayload.random:type_name -> types.H256
-	2,  // 15: types.ExecutionPayload.extraData:type_name -> types.H256
-	2,  // 16: types.ExecutionPayload.baseFeePerGas:type_name -> types.H256
-	2,  // 17: types.ExecutionPayload.blockHash:type_name -> types.H256
-	8,  // 18: types.NodeInfoReply.ports:type_name -> types.NodeInfoPorts
-	10, // 19: types.service_major_version:extendee -> google.protobuf.FileOptions
-	10, // 20: types.service_minor_version:extendee -> google.protobuf.FileOptions
-	10, // 21: types.service_patch_version:extendee -> google.protobuf.FileOptions
-	22, // [22:22] is the sub-list for method output_type
-	22, // [22:22] is the sub-list for method input_type
-	22, // [22:22] is the sub-list for extension type_name
-	19, // [19:22] is the sub-list for extension extendee
-	0,  // [0:19] is the sub-list for field type_name
+	2,  // 15: types.ExecutionPayload.baseFeePerGas:type_name -> types.H256
+	2,  // 16: types.ExecutionPayload.blockHash:type_name -> types.H256
+	8,  // 17: types.NodeInfoReply.ports:type_name -> types.NodeInfoPorts
+	10, // 18: types.service_major_version:extendee -> google.protobuf.FileOptions
+	10, // 19: types.service_minor_version:extendee -> google.protobuf.FileOptions
+	10, // 20: types.service_patch_version:extendee -> google.protobuf.FileOptions
+	21, // [21:21] is the sub-list for method output_type
+	21, // [21:21] is the sub-list for method input_type
+	21, // [21:21] is the sub-list for extension type_name
+	18, // [18:21] is the sub-list for extension extendee
+	0,  // [0:18] is the sub-list for field type_name
 }
 
 func init() { file_types_types_proto_init() }
diff --git a/interfaces/remote/ethbackend.proto b/interfaces/remote/ethbackend.proto
index 7406b8f83..03f0b1bc3 100644
--- a/interfaces/remote/ethbackend.proto
+++ b/interfaces/remote/ethbackend.proto
@@ -70,10 +70,9 @@ message EngineExecutePayloadReply {
 }
 
 message EnginePreparePayload {
-  types.H256 parentHash = 1;
-  uint64 timestamp = 2;
-  types.H256 random = 3;
-  types.H160 feeRecipient = 4;
+  uint64 timestamp = 1;
+  types.H256 random = 2;
+  types.H160 feeRecipient = 3;
 }
 
 message EngineForkChoiceUpdated {
@@ -83,8 +82,8 @@ message EngineForkChoiceUpdated {
 }
 
 message EngineForkChoiceUpdatedRequest {
-  EnginePreparePayload headBlockHash = 1;
-  EngineForkChoiceUpdated safeBlockHash = 2;
+  EngineForkChoiceUpdated forkchoice = 1;
+  EnginePreparePayload prepare = 2;
 }
 
 message EngineForkChoiceUpdatedReply {
diff --git a/interfaces/types/types.proto b/interfaces/types/types.proto
index 3e6c7eba8..9397aad37 100644
--- a/interfaces/types/types.proto
+++ b/interfaces/types/types.proto
@@ -65,7 +65,7 @@ message ExecutionPayload {
   uint64 gasLimit = 8;
   uint64 gasUsed = 9;
   uint64 timestamp = 10;
-  types.H256 extraData = 11;
+  bytes extraData = 11;
   types.H256 baseFeePerGas = 12;
   types.H256 blockHash = 13;
   /*