diff --git a/api/service/legacysync/downloader/client.go b/api/service/legacysync/downloader/client.go
index ac03e2130..5cb786ac2 100644
--- a/api/service/legacysync/downloader/client.go
+++ b/api/service/legacysync/downloader/client.go
@@ -113,7 +113,7 @@ func (client *Client) GetBlocksAndSigs(hashes [][]byte) *pb.DownloaderResponse {
 func (client *Client) Register(hash []byte, ip, port string) *pb.DownloaderResponse {
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 	defer cancel()
-	request := &pb.DownloaderRequest{Type: pb.DownloaderRequest_REGISTER}
+	request := &pb.DownloaderRequest{Type: pb.DownloaderRequest_REGISTER, RegisterWithSig: true}
 	request.PeerHash = make([]byte, len(hash))
 	copy(request.PeerHash, hash)
 	request.Ip = ip
diff --git a/api/service/legacysync/downloader/proto/downloader.pb.go b/api/service/legacysync/downloader/proto/downloader.pb.go
index fd947f6dd..0185c64db 100644
--- a/api/service/legacysync/downloader/proto/downloader.pb.go
+++ b/api/service/legacysync/downloader/proto/downloader.pb.go
@@ -154,12 +154,13 @@ type DownloaderRequest struct {
 	// Request type.
 	Type DownloaderRequest_RequestType `protobuf:"varint,1,opt,name=type,proto3,enum=downloader.DownloaderRequest_RequestType" json:"type,omitempty"`
 	// The hashes of the blocks we want to download.
-	Hashes    [][]byte `protobuf:"bytes,2,rep,name=hashes,proto3" json:"hashes,omitempty"`
-	PeerHash  []byte   `protobuf:"bytes,3,opt,name=peerHash,proto3" json:"peerHash,omitempty"`
-	BlockHash []byte   `protobuf:"bytes,4,opt,name=blockHash,proto3" json:"blockHash,omitempty"`
-	Ip        string   `protobuf:"bytes,5,opt,name=ip,proto3" json:"ip,omitempty"`
-	Port      string   `protobuf:"bytes,6,opt,name=port,proto3" json:"port,omitempty"`
-	Size      uint32   `protobuf:"varint,7,opt,name=size,proto3" json:"size,omitempty"`
+	Hashes          [][]byte `protobuf:"bytes,2,rep,name=hashes,proto3" json:"hashes,omitempty"`
+	PeerHash        []byte   `protobuf:"bytes,3,opt,name=peerHash,proto3" json:"peerHash,omitempty"`
+	BlockHash       []byte   `protobuf:"bytes,4,opt,name=blockHash,proto3" json:"blockHash,omitempty"`
+	Ip              string   `protobuf:"bytes,5,opt,name=ip,proto3" json:"ip,omitempty"`
+	Port            string   `protobuf:"bytes,6,opt,name=port,proto3" json:"port,omitempty"`
+	Size            uint32   `protobuf:"varint,7,opt,name=size,proto3" json:"size,omitempty"`
+	RegisterWithSig bool     `protobuf:"varint,8,opt,name=registerWithSig,proto3" json:"registerWithSig,omitempty"` // Expect to have NEWBLOCK response with signature
 }
 
 func (x *DownloaderRequest) Reset() {
@@ -243,6 +244,13 @@ func (x *DownloaderRequest) GetSize() uint32 {
 	return 0
 }
 
+func (x *DownloaderRequest) GetRegisterWithSig() bool {
+	if x != nil {
+		return x.RegisterWithSig
+	}
+	return false
+}
+
 // DownloaderResponse is the generic response of DownloaderRequest.
 type DownloaderResponse struct {
 	state         protoimpl.MessageState
@@ -313,8 +321,8 @@ var File_downloader_proto protoreflect.FileDescriptor
 
 var file_downloader_proto_rawDesc = []byte{
 	0x0a, 0x10, 0x64, 0x6f, 0x77, 0x6e, 0x6c, 0x6f, 0x61, 0x64, 0x65, 0x72, 0x2e, 0x70, 0x72, 0x6f,
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-	0x02, 0x0a, 0x11, 0x44, 0x6f, 0x77, 0x6e, 0x6c, 0x6f, 0x61, 0x64, 0x65, 0x72, 0x52, 0x65, 0x71,
+	0x74, 0x6f, 0x12, 0x0a, 0x64, 0x6f, 0x77, 0x6e, 0x6c, 0x6f, 0x61, 0x64, 0x65, 0x72, 0x22, 0xa2,
+	0x03, 0x0a, 0x11, 0x44, 0x6f, 0x77, 0x6e, 0x6c, 0x6f, 0x61, 0x64, 0x65, 0x72, 0x52, 0x65, 0x71,
 	0x75, 0x65, 0x73, 0x74, 0x12, 0x3d, 0x0a, 0x04, 0x74, 0x79, 0x70, 0x65, 0x18, 0x01, 0x20, 0x01,
 	0x28, 0x0e, 0x32, 0x29, 0x2e, 0x64, 0x6f, 0x77, 0x6e, 0x6c, 0x6f, 0x61, 0x64, 0x65, 0x72, 0x2e,
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@@ -327,36 +335,39 @@ var file_downloader_proto_rawDesc = []byte{
 	0x6b, 0x48, 0x61, 0x73, 0x68, 0x12, 0x0e, 0x0a, 0x02, 0x69, 0x70, 0x18, 0x05, 0x20, 0x01, 0x28,
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 }
 
 var (
diff --git a/api/service/legacysync/downloader/proto/downloader.proto b/api/service/legacysync/downloader/proto/downloader.proto
index bafed0ff9..2be54682b 100644
--- a/api/service/legacysync/downloader/proto/downloader.proto
+++ b/api/service/legacysync/downloader/proto/downloader.proto
@@ -31,6 +31,7 @@ message DownloaderRequest {
   string ip = 5;
   string port = 6;
   uint32 size = 7;
+  bool registerWithSig = 8; // Expect to have NEWBLOCK response of block along with current signature
 }
 
 // DownloaderResponse is the generic response of DownloaderRequest.
diff --git a/api/service/legacysync/syncing.go b/api/service/legacysync/syncing.go
index 07e17b253..deb962159 100644
--- a/api/service/legacysync/syncing.go
+++ b/api/service/legacysync/syncing.go
@@ -907,7 +907,7 @@ func (ss *StateSync) generateNewState(bc *core.BlockChain, worker *worker.Worker
 		if block == nil {
 			break
 		}
-		err = ss.UpdateBlockAndStatus(block, bc, worker, false)
+		err = ss.UpdateBlockAndStatus(block, bc, worker, true)
 		if err != nil {
 			break
 		}
diff --git a/node/node.go b/node/node.go
index b3fe10a93..951af2c08 100644
--- a/node/node.go
+++ b/node/node.go
@@ -66,6 +66,8 @@ const (
 type syncConfig struct {
 	timestamp int64
 	client    *downloader.Client
+	// Determine to send encoded BlockWithSig or Block
+	withSig bool
 }
 
 // Node represents a protocol-participating node in the network
diff --git a/node/node_syncing.go b/node/node_syncing.go
index d9e45a294..9e1dd8962 100644
--- a/node/node_syncing.go
+++ b/node/node_syncing.go
@@ -357,6 +357,11 @@ func (node *Node) SendNewBlockToUnsync() {
 			utils.Logger().Warn().Msg("[SYNC] unable to encode block to hashes")
 			continue
 		}
+		blockWithSigBytes, err := node.getEncodedBlockWithSigFromBlock(block)
+		if err != nil {
+			utils.Logger().Warn().Err(err).Msg("[SYNC] rlp encode BlockWithSig")
+			continue
+		}
 
 		node.stateMutex.Lock()
 		for peerID, config := range node.peerRegistrationRecord {
@@ -367,7 +372,11 @@ func (node *Node) SendNewBlockToUnsync() {
 				delete(node.peerRegistrationRecord, peerID)
 				continue
 			}
-			response, err := config.client.PushNewBlock(node.GetSyncID(), blockBytes, false)
+			sendBytes := blockBytes
+			if config.withSig {
+				sendBytes = blockWithSigBytes
+			}
+			response, err := config.client.PushNewBlock(node.GetSyncID(), sendBytes, false)
 			// close the connection if cannot push new block to unsync node
 			if err != nil {
 				node.peerRegistrationRecord[peerID].client.Close()
@@ -470,18 +479,21 @@ func (node *Node) CalculateResponse(request *downloader_pb.DownloaderRequest, in
 			response.Type = downloader_pb.DownloaderResponse_INSYNC
 			return response, nil
 		}
-		var blockObj types.Block
-		err := rlp.DecodeBytes(request.BlockHash, &blockObj)
+		var bws legacysync.BlockWithSig
+		err := rlp.DecodeBytes(request.BlockHash, &bws)
 		if err != nil {
 			utils.Logger().Warn().Msg("[SYNC] unable to decode received new block")
 			return response, err
 		}
-		node.stateSync.AddNewBlock(request.PeerHash, &blockObj)
+		blockObj := bws.Block
+		blockObj.SetCurrentCommitSig(bws.CommitSigAndBitmap)
+		node.stateSync.AddNewBlock(request.PeerHash, blockObj)
 
 	case downloader_pb.DownloaderRequest_REGISTER:
 		peerID := string(request.PeerHash[:])
 		ip := request.Ip
 		port := request.Port
+		withSig := request.RegisterWithSig
 		node.stateMutex.Lock()
 		defer node.stateMutex.Unlock()
 		if _, ok := node.peerRegistrationRecord[peerID]; ok {
@@ -509,7 +521,7 @@ func (node *Node) CalculateResponse(request *downloader_pb.DownloaderRequest, in
 					Msg("[SYNC] unable to setup client for peerID")
 				return response, nil
 			}
-			config := &syncConfig{timestamp: time.Now().UnixNano(), client: client}
+			config := &syncConfig{timestamp: time.Now().UnixNano(), client: client, withSig: withSig}
 			node.peerRegistrationRecord[peerID] = config
 			utils.Logger().Debug().
 				Str("ip", ip).
@@ -603,6 +615,14 @@ func (node *Node) getEncodedBlockWithSigByHash(hash common.Hash) ([]byte, error)
 	return b, nil
 }
 
+func (node *Node) getEncodedBlockWithSigFromBlock(block *types.Block) ([]byte, error) {
+	bwh := legacysync.BlockWithSig{
+		Block:              block,
+		CommitSigAndBitmap: block.GetCurrentCommitSig(),
+	}
+	return rlp.EncodeToBytes(bwh)
+}
+
 func (node *Node) getCommitSigAndBitmap(block *types.Block) ([]byte, error) {
 	child := node.Blockchain().GetBlockByNumber(block.NumberU64() + 1)
 	if child != nil {