diff --git a/benchmark_main.go b/benchmark_main.go
index 841df3aedc..03cb6e8366 100644
--- a/benchmark_main.go
+++ b/benchmark_main.go
@@ -47,6 +47,18 @@ func getPeers(myIp, myPort, myShardId string, config *[][]string) []p2p.Peer {
 	return peerList
 }
 
+func getClientPeer(config *[][]string) *p2p.Peer {
+	for _, node := range *config {
+		ip, port, status := node[0], node[1], node[2]
+		if status == "client" {
+			continue
+		}
+		peer := p2p.Peer{Port: port, Ip: ip}
+		return &peer
+	}
+	return nil
+}
+
 func readConfigFile(configFile string) [][]string {
 	file, _ := os.Open(configFile)
 	fscanner := bufio.NewScanner(file)
@@ -84,6 +96,12 @@ func main() {
 
 	node := node.NewNode(&consensus)
 
+	clientPeer := getClientPeer(&config)
+	// If there is a client configured in the node list.
+	if clientPeer != nil {
+		node.ClientPeer = clientPeer
+	}
+
 	// Assign closure functions to the consensus object
 	consensus.BlockVerifier = node.VerifyNewBlock
 	consensus.OnConsensusDone = node.PostConsensusProcessing
diff --git a/node/message.go b/node/message.go
index 9ff8789c32..d3bf7d9154 100644
--- a/node/message.go
+++ b/node/message.go
@@ -13,6 +13,7 @@ type TransactionMessageType int
 const (
 	SEND TransactionMessageType = iota
 	REQUEST
+	CROSS_TX_PROOF // The proof of accept or reject returned by the leader to the cross shard transaction client.
 )
 
 // The types of messages used for NODE/CONTROL
@@ -22,7 +23,7 @@ const (
 	STOP ControlMessageType = iota
 )
 
-//ConstructTransactionListMessage constructs serialized transactions
+// Constructs serialized transactions
 func ConstructTransactionListMessage(transactions []*blockchain.Transaction) []byte {
 	byteBuffer := bytes.NewBuffer([]byte{byte(common.NODE)})
 	byteBuffer.WriteByte(byte(common.TRANSACTION))
@@ -37,7 +38,7 @@ func ConstructTransactionListMessage(transactions []*blockchain.Transaction) []b
 	return byteBuffer.Bytes()
 }
 
-//ConstructTransactionListMessage constructs serialized transactions
+// Constructs serialized transactions
 func ConstructRequestTransactionsMessage(transactionIds [][]byte) []byte {
 	byteBuffer := bytes.NewBuffer([]byte{byte(common.NODE)})
 	byteBuffer.WriteByte(byte(common.TRANSACTION))
@@ -48,10 +49,18 @@ func ConstructRequestTransactionsMessage(transactionIds [][]byte) []byte {
 	return byteBuffer.Bytes()
 }
 
-//ConstructStopMessage is  STOP message
+// Constructs STOP message for node to stop
 func ConstructStopMessage() []byte {
 	byteBuffer := bytes.NewBuffer([]byte{byte(common.NODE)})
 	byteBuffer.WriteByte(byte(common.CONTROL))
 	byteBuffer.WriteByte(byte(STOP))
 	return byteBuffer.Bytes()
 }
+
+//ConstructStopMessage is  STOP message
+func ConstructProofOfAcceptOrRejectMessage() []byte {
+	byteBuffer := bytes.NewBuffer([]byte{byte(common.NODE)})
+	byteBuffer.WriteByte(byte(common.TRANSACTION))
+	byteBuffer.WriteByte(byte(CROSS_TX_PROOF))
+	return byteBuffer.Bytes()
+}
diff --git a/node/node.go b/node/node.go
index f4c37b59f8..bbde77dc87 100644
--- a/node/node.go
+++ b/node/node.go
@@ -4,6 +4,7 @@ import (
 	"harmony-benchmark/blockchain"
 	"harmony-benchmark/consensus"
 	"harmony-benchmark/log"
+	"harmony-benchmark/p2p"
 	"net"
 	"os"
 	"strconv"
@@ -25,6 +26,8 @@ type Node struct {
 
 	pendingTxMutex       sync.Mutex
 	crossTxToReturnMutex sync.Mutex
+
+	ClientPeer *p2p.Peer // The peer for the benchmark tx generator client, used to return proof-of-accept
 }
 
 // Add new crossTx and proofs to the list of crossTx that needs to be sent back to client
diff --git a/node/node_handler.go b/node/node_handler.go
index 32aca5f94c..0a9d58bd77 100644
--- a/node/node_handler.go
+++ b/node/node_handler.go
@@ -108,8 +108,9 @@ func (node *Node) transactionMessageHandler(msgPayload []byte) {
 				txToReturn = append(txToReturn, tx)
 			}
 		}
-
 		// TODO: return the transaction list to requester
+	case CROSS_TX_PROOF:
+		// TODO: implement this
 	}
 }
 
@@ -160,6 +161,13 @@ func (node *Node) WaitForConsensusReady(readySignal chan int) {
 	}
 }
 
+// This is called by consensus participants to verify the block they are running consensus on
+func (node *Node) SendBackProofOfAcceptOrReject() {
+	if node.ClientPeer != nil {
+		p2p.SendMessage(*node.ClientPeer, ConstructProofOfAcceptOrRejectMessage())
+	}
+}
+
 // This is called by consensus participants to verify the block they are running consensus on
 func (node *Node) VerifyNewBlock(newBlock *blockchain.Block) bool {
 	return node.UtxoPool.VerifyTransactions(newBlock.Transactions)
@@ -184,5 +192,7 @@ func (node *Node) PostConsensusProcessing(newBlock *blockchain.Block) {
 		}
 		node.addCrossTxsToReturn(node.CrossTxsInConsensus)
 		node.CrossTxsInConsensus = []*blockchain.CrossShardTxAndProof{}
+
+		node.SendBackProofOfAcceptOrReject()
 	}
 }