diff --git a/consensus/consensus.go b/consensus/consensus.go
index 096a93ef8..c702086aa 100644
--- a/consensus/consensus.go
+++ b/consensus/consensus.go
@@ -97,6 +97,8 @@ type Consensus struct {
 	OnConsensusDone func(*types.Block)
 	// The verifier func passed from Node object
 	BlockVerifier func(*types.Block) error
+	// Block Proposer proposes new block at the specific block number
+	BlockProposer func(blockNum uint64) (*types.Block, error)
 	// verified block to state sync broadcast
 	VerifiedNewBlock chan *types.Block
 	// will trigger state syncing when blockNum is low
diff --git a/consensus/consensus_v2.go b/consensus/consensus_v2.go
index b475c047b..9f6550343 100644
--- a/consensus/consensus_v2.go
+++ b/consensus/consensus_v2.go
@@ -191,9 +191,9 @@ func (consensus *Consensus) finalizeCommits() {
 
 // BlockCommitSig returns the byte array of aggregated
 // commit signature and bitmap signed on the block
-func (consensus *Consensus) BlockCommitSig(blockNum uint64) ([]byte, []byte, error) {
+func (consensus *Consensus) BlockCommitSigs(blockNum uint64) ([]byte, error) {
 	if consensus.blockNum <= 1 {
-		return nil, nil, nil
+		return nil, nil
 	}
 	lastCommits, err := consensus.ChainReader.ReadCommitSig(blockNum)
 	if err != nil ||
@@ -205,21 +205,14 @@ func (consensus *Consensus) BlockCommitSig(blockNum uint64) ([]byte, []byte, err
 			consensus.getLogger().Error().
 				Int("numCommittedMsg", len(msgs)).
 				Msg("GetLastCommitSig failed with wrong number of committed message")
-			return nil, nil, errors.Errorf(
+			return nil, errors.Errorf(
 				"GetLastCommitSig failed with wrong number of committed message %d", len(msgs),
 			)
 		}
 		lastCommits = msgs[0].Payload
 	}
-	//#### Read payload data from committed msg
-	aggSig := make([]byte, bls.BLSSignatureSizeInBytes)
-	bitmap := make([]byte, len(lastCommits)-bls.BLSSignatureSizeInBytes)
-	offset := 0
-	copy(aggSig[:], lastCommits[offset:offset+bls.BLSSignatureSizeInBytes])
-	offset += bls.BLSSignatureSizeInBytes
-	copy(bitmap[:], lastCommits[offset:])
-	//#### END Read payload data from committed msg
-	return aggSig, bitmap, nil
+
+	return lastCommits, nil
 }
 
 // try to catch up if fall behind
diff --git a/consensus/engine/consensus_engine.go b/consensus/engine/consensus_engine.go
index d772826d8..2b9253647 100644
--- a/consensus/engine/consensus_engine.go
+++ b/consensus/engine/consensus_engine.go
@@ -115,6 +115,6 @@ type Engine interface {
 		state *state.DB, txs []*types.Transaction,
 		receipts []*types.Receipt, outcxs []*types.CXReceipt,
 		incxs []*types.CXReceiptsProof, stks staking.StakingTransactions,
-		doubleSigners slash.Records,
+		doubleSigners slash.Records, sigsReady chan bool,
 	) (*types.Block, reward.Reader, error)
 }
diff --git a/consensus/leader.go b/consensus/leader.go
index 5f5fa81f5..7047062e8 100644
--- a/consensus/leader.go
+++ b/consensus/leader.go
@@ -205,6 +205,9 @@ func (consensus *Consensus) onPrepare(msg *msg_pb.Message) {
 }
 
 func (consensus *Consensus) onCommit(msg *msg_pb.Message) {
+	if consensus.viewID == 10 {
+		return
+	}
 	recvMsg, err := consensus.ParseFBFTMessage(msg)
 	if err != nil {
 		consensus.getLogger().Debug().Err(err).Msg("[OnCommit] Parse pbft message failed")
@@ -308,7 +311,7 @@ func (consensus *Consensus) onCommit(msg *msg_pb.Message) {
 
 		consensus.getLogger().Info().Msg("[OnCommit] Starting Grace Period")
 		go func(viewID uint64) {
-			time.Sleep(2500 * time.Millisecond)
+			time.Sleep(1500 * time.Millisecond)
 			logger.Info().Msg("[OnCommit] Commit Grace Period Ended")
 			consensus.commitFinishChan <- viewID
 		}(viewID)
diff --git a/core/chain_makers.go b/core/chain_makers.go
index 4e85a0e6e..23ab7bff9 100644
--- a/core/chain_makers.go
+++ b/core/chain_makers.go
@@ -196,7 +196,7 @@ func GenerateChain(
 		if b.engine != nil {
 			// Finalize and seal the block
 			block, _, err := b.engine.Finalize(
-				chainreader, b.header, statedb, b.txs, b.receipts, nil, nil, nil, nil,
+				chainreader, b.header, statedb, b.txs, b.receipts, nil, nil, nil, nil, nil,
 			)
 			if err != nil {
 				panic(err)
diff --git a/core/state_processor.go b/core/state_processor.go
index 6664f5056..8a29fc27c 100644
--- a/core/state_processor.go
+++ b/core/state_processor.go
@@ -135,9 +135,13 @@ func (p *StateProcessor) Process(
 	}
 
 	// Finalize the block, applying any consensus engine specific extras (e.g. block rewards)
+	sigsReady := make(chan bool)
+	go func() {
+		sigsReady <- true
+	}()
 	_, payout, err := p.engine.Finalize(
 		p.bc, header, statedb, block.Transactions(),
-		receipts, outcxs, incxs, block.StakingTransactions(), slashes,
+		receipts, outcxs, incxs, block.StakingTransactions(), slashes, sigsReady,
 	)
 	if err != nil {
 		return nil, nil, nil, 0, nil, errors.New("[Process] Cannot finalize block")
diff --git a/crypto/bls/bls.go b/crypto/bls/bls.go
index 0f291debf..0ff2ae18c 100644
--- a/crypto/bls/bls.go
+++ b/crypto/bls/bls.go
@@ -95,3 +95,18 @@ func (pk *SerializedPublicKey) FromLibBLSPublicKey(key *bls.PublicKey) error {
 	copy(pk[:], bytes)
 	return nil
 }
+
+func SeparateSigAndMask(commitSigs []byte) ([]byte, []byte, error) {
+	if len(commitSigs) < BLSSignatureSizeInBytes {
+		return nil, nil, errors.New("no mask data found in commit sigs")
+	}
+	//#### Read payload data from committed msg
+	aggSig := make([]byte, BLSSignatureSizeInBytes)
+	bitmap := make([]byte, len(commitSigs)-BLSSignatureSizeInBytes)
+	offset := 0
+	copy(aggSig[:], commitSigs[offset:offset+BLSSignatureSizeInBytes])
+	offset += BLSSignatureSizeInBytes
+	copy(bitmap[:], commitSigs[offset:])
+	//#### END Read payload data from committed msg
+	return aggSig, bitmap, nil
+}
diff --git a/internal/chain/engine.go b/internal/chain/engine.go
index a8fb611d9..4bd7aba5c 100644
--- a/internal/chain/engine.go
+++ b/internal/chain/engine.go
@@ -208,7 +208,7 @@ func (e *engineImpl) Finalize(
 	state *state.DB, txs []*types.Transaction,
 	receipts []*types.Receipt, outcxs []*types.CXReceipt,
 	incxs []*types.CXReceiptsProof, stks staking.StakingTransactions,
-	doubleSigners slash.Records,
+	doubleSigners slash.Records, sigsReady chan bool,
 ) (*types.Block, reward.Reader, error) {
 
 	isBeaconChain := header.ShardID() == shard.BeaconChainShardID
@@ -249,10 +249,10 @@ func (e *engineImpl) Finalize(
 	// Accumulate block rewards and commit the final state root
 	// Header seems complete, assemble into a block and return
 	payout, err := AccumulateRewardsAndCountSigs(
-		chain, state, header, e.Beaconchain(),
+		chain, state, header, e.Beaconchain(), sigsReady,
 	)
 	if err != nil {
-		return nil, nil, errors.New("cannot pay block reward")
+		return nil, nil, err
 	}
 
 	// Apply slashes
diff --git a/internal/chain/reward.go b/internal/chain/reward.go
index 265da6fb2..ed342566b 100644
--- a/internal/chain/reward.go
+++ b/internal/chain/reward.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"math/big"
 	"sort"
+	"time"
 
 	"github.com/harmony-one/harmony/internal/params"
 
@@ -116,27 +117,25 @@ func lookupDelegatorShares(
 // This func also do IncrementValidatorSigningCounts for validators
 func AccumulateRewardsAndCountSigs(
 	bc engine.ChainReader, state *state.DB,
-	header *block.Header, beaconChain engine.ChainReader,
+	header *block.Header, beaconChain engine.ChainReader, sigsReady chan bool,
 ) (reward.Reader, error) {
 	blockNum := header.Number().Uint64()
 	currentHeader := beaconChain.CurrentHeader()
 	nowEpoch, blockNow := currentHeader.Epoch(), currentHeader.Number()
 
-	if blockNum == 0 {
-		// genesis block has no parent to reward.
-		return network.EmptyPayout, nil
-	}
-
-	if bc.Config().IsStaking(header.Epoch()) &&
-		bc.CurrentHeader().ShardID() != shard.BeaconChainShardID {
+	if blockNum == 0 || (bc.Config().IsStaking(header.Epoch()) &&
+		bc.CurrentHeader().ShardID() != shard.BeaconChainShardID) {
+		// Block here until the commit sigs are ready or timeout.
+		// sigsReady signal indicates that the commit sigs are already populated in the header object.
+		if err := waitForCommitSigs(sigsReady); err != nil {
+			return network.EmptyPayout, err
+		}
 		return network.EmptyPayout, nil
-
 	}
 
 	// After staking
 	if headerE := header.Epoch(); bc.Config().IsStaking(headerE) &&
 		bc.CurrentHeader().ShardID() == shard.BeaconChainShardID {
-		utils.AnalysisStart("accumulateRewardBeaconchainSelfPayout", nowEpoch, blockNow)
 		defaultReward := network.BaseStakedReward
 
 		// After block time is reduced to 5 seconds, the block reward is adjusted accordingly
@@ -182,72 +181,9 @@ func AccumulateRewardsAndCountSigs(
 		newRewards, beaconP, shardP :=
 			big.NewInt(0), []reward.Payout{}, []reward.Payout{}
 
-		// Take care of my own beacon chain committee, _ is missing, for slashing
-		parentE, members, payable, missing, err := ballotResultBeaconchain(beaconChain, header)
-		if err != nil {
-			return network.EmptyPayout, err
-		}
-		subComm := shard.Committee{shard.BeaconChainShardID, members}
-
-		if err := availability.IncrementValidatorSigningCounts(
-			beaconChain,
-			subComm.StakedValidators(),
-			state,
-			payable,
-			missing,
-		); err != nil {
-			return network.EmptyPayout, err
-		}
-		votingPower, err := lookupVotingPower(
-			parentE, &subComm,
-		)
-		if err != nil {
-			return network.EmptyPayout, err
-		}
-
-		allSignersShare := numeric.ZeroDec()
-		for j := range payable {
-			voter := votingPower.Voters[payable[j].BLSPublicKey]
-			if !voter.IsHarmonyNode {
-				voterShare := voter.OverallPercent
-				allSignersShare = allSignersShare.Add(voterShare)
-			}
-		}
-		for beaconMember := range payable {
-			// TODO Give out whatever leftover to the last voter/handle
-			// what to do about share of those that didn't sign
-			blsKey := payable[beaconMember].BLSPublicKey
-			voter := votingPower.Voters[blsKey]
-			if !voter.IsHarmonyNode {
-				snapshot, err := bc.ReadValidatorSnapshot(voter.EarningAccount)
-				if err != nil {
-					return network.EmptyPayout, err
-				}
-				due := defaultReward.Mul(
-					voter.OverallPercent.Quo(allSignersShare),
-				).RoundInt()
-				newRewards.Add(newRewards, due)
-
-				shares, err := lookupDelegatorShares(snapshot)
-				if err != nil {
-					return network.EmptyPayout, err
-				}
-				if err := state.AddReward(snapshot.Validator, due, shares); err != nil {
-					return network.EmptyPayout, err
-				}
-				beaconP = append(beaconP, reward.Payout{
-					ShardID:     shard.BeaconChainShardID,
-					Addr:        voter.EarningAccount,
-					NewlyEarned: due,
-					EarningKey:  voter.Identity,
-				})
-			}
-		}
-		utils.AnalysisEnd("accumulateRewardBeaconchainSelfPayout", nowEpoch, blockNow)
-
-		utils.AnalysisStart("accumulateRewardShardchainPayout", nowEpoch, blockNow)
 		// Handle rewards for shardchain
 		if cxLinks := header.CrossLinks(); len(cxLinks) > 0 {
+			utils.AnalysisStart("accumulateRewardShardchainPayout", nowEpoch, blockNow)
 			crossLinks := types.CrossLinks{}
 			if err := rlp.DecodeBytes(cxLinks, &crossLinks); err != nil {
 				return network.EmptyPayout, err
@@ -391,11 +327,81 @@ func AccumulateRewardsAndCountSigs(
 				}
 			}
 			utils.AnalysisEnd("accumulateRewardShardchainPayout", nowEpoch, blockNow)
-			return network.NewStakingEraRewardForRound(
-				newRewards, missing, beaconP, shardP,
-			), nil
 		}
-		return network.EmptyPayout, nil
+
+		// Block here until the commit sigs are ready or timeout.
+		// sigsReady signal indicates that the commit sigs are already populated in the header object.
+		if err := waitForCommitSigs(sigsReady); err != nil {
+			return network.EmptyPayout, err
+		}
+
+		utils.AnalysisStart("accumulateRewardBeaconchainSelfPayout", nowEpoch, blockNow)
+		// Take care of my own beacon chain committee, _ is missing, for slashing
+		parentE, members, payable, missing, err := ballotResultBeaconchain(beaconChain, header)
+		if err != nil {
+			return network.EmptyPayout, err
+		}
+		subComm := shard.Committee{shard.BeaconChainShardID, members}
+
+		if err := availability.IncrementValidatorSigningCounts(
+			beaconChain,
+			subComm.StakedValidators(),
+			state,
+			payable,
+			missing,
+		); err != nil {
+			return network.EmptyPayout, err
+		}
+		votingPower, err := lookupVotingPower(
+			parentE, &subComm,
+		)
+		if err != nil {
+			return network.EmptyPayout, err
+		}
+
+		allSignersShare := numeric.ZeroDec()
+		for j := range payable {
+			voter := votingPower.Voters[payable[j].BLSPublicKey]
+			if !voter.IsHarmonyNode {
+				voterShare := voter.OverallPercent
+				allSignersShare = allSignersShare.Add(voterShare)
+			}
+		}
+		for beaconMember := range payable {
+			// TODO Give out whatever leftover to the last voter/handle
+			// what to do about share of those that didn't sign
+			blsKey := payable[beaconMember].BLSPublicKey
+			voter := votingPower.Voters[blsKey]
+			if !voter.IsHarmonyNode {
+				snapshot, err := bc.ReadValidatorSnapshot(voter.EarningAccount)
+				if err != nil {
+					return network.EmptyPayout, err
+				}
+				due := defaultReward.Mul(
+					voter.OverallPercent.Quo(allSignersShare),
+				).RoundInt()
+				newRewards.Add(newRewards, due)
+
+				shares, err := lookupDelegatorShares(snapshot)
+				if err != nil {
+					return network.EmptyPayout, err
+				}
+				if err := state.AddReward(snapshot.Validator, due, shares); err != nil {
+					return network.EmptyPayout, err
+				}
+				beaconP = append(beaconP, reward.Payout{
+					ShardID:     shard.BeaconChainShardID,
+					Addr:        voter.EarningAccount,
+					NewlyEarned: due,
+					EarningKey:  voter.Identity,
+				})
+			}
+		}
+		utils.AnalysisEnd("accumulateRewardBeaconchainSelfPayout", nowEpoch, blockNow)
+
+		return network.NewStakingEraRewardForRound(
+			newRewards, missing, beaconP, shardP,
+		), nil
 	}
 
 	// Before staking
@@ -417,6 +423,13 @@ func AccumulateRewardsAndCountSigs(
 			err, "cannot read shard state at epoch %v", parentHeader.Epoch(),
 		)
 	}
+
+	// Block here until the commit sigs are ready or timeout.
+	// sigsReady signal indicates that the commit sigs are already populated in the header object.
+	if err := waitForCommitSigs(sigsReady); err != nil {
+		return network.EmptyPayout, err
+	}
+
 	_, signers, _, err := availability.BallotResult(
 		parentHeader, header, parentShardState, header.ShardID(),
 	)
@@ -452,3 +465,16 @@ func AccumulateRewardsAndCountSigs(
 
 	return network.NewPreStakingEraRewarded(totalAmount), nil
 }
+
+func waitForCommitSigs(sigsReady chan bool) error {
+	select {
+	case success := <-sigsReady:
+		if !success {
+			return errors.New("Failed to get commit sigs")
+		}
+		utils.Logger().Info().Msg("Commit sigs are ready")
+	case <-time.After(10 * time.Second):
+		return errors.New("Timeout waiting for commit sigs for reward calculation")
+	}
+	return nil
+}
diff --git a/node/node_handler_test.go b/node/node_handler_test.go
index b53ae8ab3..bc35701d9 100644
--- a/node/node_handler_test.go
+++ b/node/node_handler_test.go
@@ -42,8 +42,12 @@ func TestAddNewBlock(t *testing.T) {
 	node.Worker.CommitTransactions(
 		txs, stks, common.Address{},
 	)
+	commitSigs := make(chan []byte)
+	go func() {
+		commitSigs <- []byte{}
+	}()
 	block, _ := node.Worker.FinalizeNewBlock(
-		[]byte{}, []byte{}, 0, common.Address{}, nil, nil,
+		commitSigs, 0, common.Address{}, nil, nil,
 	)
 
 	_, err = node.Blockchain().InsertChain([]*types.Block{block}, true)
@@ -81,8 +85,12 @@ func TestVerifyNewBlock(t *testing.T) {
 	node.Worker.CommitTransactions(
 		txs, stks, common.Address{},
 	)
+	commitSigs := make(chan []byte)
+	go func() {
+		commitSigs <- []byte{}
+	}()
 	block, _ := node.Worker.FinalizeNewBlock(
-		[]byte{}, []byte{}, 0, common.Address{}, nil, nil,
+		commitSigs, 0, common.Address{}, nil, nil,
 	)
 
 	if err := node.VerifyNewBlock(block); err != nil {
diff --git a/node/node_newblock.go b/node/node_newblock.go
index 1a20c6ad3..68947b5a8 100644
--- a/node/node_newblock.go
+++ b/node/node_newblock.go
@@ -47,12 +47,18 @@ func (node *Node) WaitForConsensusReadyV2(readySignal chan struct{}, stopChan ch
 						Uint64("blockNum", node.Blockchain().CurrentBlock().NumberU64()+1).
 						Msg("PROPOSING NEW BLOCK ------------------------------------------------")
 
-					newBlock, err := node.proposeNewBlock()
+					// Prepare last commit signatures
+					commitSigs := make(chan []byte)
+					sigs, err := node.Consensus.BlockCommitSigs(node.Blockchain().CurrentBlock().NumberU64())
 					if err != nil {
-						utils.Logger().Err(err).Msg("!!!!!!!!!Failed Proposing New Block!!!!!!!!!")
+						utils.Logger().Error().Err(err).Msg("[proposeNewBlock] Cannot get commit signatures from last block")
+						break
 					}
+					go func() {
+						commitSigs <- sigs
+					}()
+					newBlock, err := node.ProposeNewBlock(commitSigs)
 
-					err = node.Blockchain().Validator().ValidateHeader(newBlock, true)
 					if err == nil {
 						utils.Logger().Info().
 							Uint64("blockNum", newBlock.NumberU64()).
@@ -67,7 +73,7 @@ func (node *Node) WaitForConsensusReadyV2(readySignal chan struct{}, stopChan ch
 						node.BlockChannel <- newBlock
 						break
 					} else {
-						utils.Logger().Err(err).Msg("!!!!!!!!!Failed Verifying New Block Header!!!!!!!!!")
+						utils.Logger().Err(err).Msg("!!!!!!!!!Failed Proposing New Block!!!!!!!!!")
 					}
 				}
 			}
@@ -75,7 +81,7 @@ func (node *Node) WaitForConsensusReadyV2(readySignal chan struct{}, stopChan ch
 	}()
 }
 
-func (node *Node) proposeNewBlock() (*types.Block, error) {
+func (node *Node) ProposeNewBlock(commitSigs chan []byte) (*types.Block, error) {
 	currentHeader := node.Blockchain().CurrentHeader()
 	nowEpoch, blockNow := currentHeader.Epoch(), currentHeader.Number()
 	utils.AnalysisStart("proposeNewBlock", nowEpoch, blockNow)
@@ -224,17 +230,22 @@ func (node *Node) proposeNewBlock() (*types.Block, error) {
 		return nil, err
 	}
 
-	// Prepare last commit signatures
-	sig, mask, err := node.Consensus.BlockCommitSig(header.Number().Uint64() - 1)
+	finalizedBlock, err := node.Worker.FinalizeNewBlock(
+		commitSigs, node.Consensus.GetViewID(),
+		coinbase, crossLinksToPropose, shardState,
+	)
 	if err != nil {
-		utils.Logger().Error().Err(err).Msg("[proposeNewBlock] Cannot get commit signatures from last block")
+		utils.Logger().Error().Err(err).Msg("[proposeNewBlock] Failed finalizing the new block")
 		return nil, err
 	}
+	utils.Logger().Info().Msg("[proposeNewBlock] verifying the new block header")
+	err = node.Blockchain().Validator().ValidateHeader(finalizedBlock, true)
 
-	return node.Worker.FinalizeNewBlock(
-		sig, mask, node.Consensus.GetViewID(),
-		coinbase, crossLinksToPropose, shardState,
-	)
+	if err != nil {
+		utils.Logger().Error().Err(err).Msg("[proposeNewBlock] Failed verifying the new block header")
+		return nil, err
+	}
+	return finalizedBlock, nil
 }
 
 func (node *Node) proposeReceiptsProof() []*types.CXReceiptsProof {
diff --git a/node/worker/worker.go b/node/worker/worker.go
index d141730a8..ac82ae078 100644
--- a/node/worker/worker.go
+++ b/node/worker/worker.go
@@ -7,6 +7,8 @@ import (
 	"sort"
 	"time"
 
+	"github.com/harmony-one/harmony/crypto/bls"
+
 	"github.com/harmony-one/harmony/crypto/hash"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -422,18 +424,9 @@ func (w *Worker) verifySlashes(
 
 // FinalizeNewBlock generate a new block for the next consensus round.
 func (w *Worker) FinalizeNewBlock(
-	sig []byte, signers []byte, viewID uint64, coinbase common.Address,
+	commitSigs chan []byte, viewID uint64, coinbase common.Address,
 	crossLinks types.CrossLinks, shardState *shard.State,
 ) (*types.Block, error) {
-	// Put sig, signers, viewID, coinbase into header
-	if len(sig) > 0 && len(signers) > 0 {
-		// TODO: directly set signature into lastCommitSignature
-		sig2 := w.current.header.LastCommitSignature()
-		copy(sig2[:], sig[:])
-		w.current.header.SetLastCommitSignature(sig2)
-		w.current.header.SetLastCommitBitmap(signers)
-	}
-
 	w.current.header.SetCoinbase(coinbase)
 	w.current.header.SetViewID(new(big.Int).SetUint64(viewID))
 
@@ -491,15 +484,39 @@ func (w *Worker) FinalizeNewBlock(
 	}
 	state := w.current.state.Copy()
 	copyHeader := types.CopyHeader(w.current.header)
+
+	sigsReady := make(chan bool)
+	go func() {
+		select {
+		case sigs := <-commitSigs:
+			sig, signers, err := bls.SeparateSigAndMask(sigs)
+			if err != nil {
+				utils.Logger().Error().Err(err).Msg("Failed to parse commit sigs")
+				sigsReady <- false
+			}
+			// Put sig, signers, viewID, coinbase into header
+			if len(sig) > 0 && len(signers) > 0 {
+				sig2 := copyHeader.LastCommitSignature()
+				copy(sig2[:], sig[:])
+				utils.Logger().Info().Hex("sigs", sig).Hex("bitmap", signers).Msg("Setting commit sigs")
+				copyHeader.SetLastCommitSignature(sig2)
+				copyHeader.SetLastCommitBitmap(signers)
+			}
+			sigsReady <- true
+		case <-time.After(10 * time.Second):
+			// Exit goroutine
+			utils.Logger().Warn().Msg("Timeout waiting for commit sigs")
+		}
+	}()
+
 	block, _, err := w.engine.Finalize(
 		w.chain, copyHeader, state, w.current.txs, w.current.receipts,
 		w.current.outcxs, w.current.incxs, w.current.stakingTxs,
-		w.current.slashes,
+		w.current.slashes, sigsReady,
 	)
 	if err != nil {
 		return nil, errors.Wrapf(err, "cannot finalize block")
 	}
-
 	return block, nil
 }
 
diff --git a/test/chain/bls/main.go b/test/chain/bls/main.go
new file mode 100644
index 000000000..f54f42a01
--- /dev/null
+++ b/test/chain/bls/main.go
@@ -0,0 +1,86 @@
+package main
+
+import (
+	"fmt"
+	"github.com/harmony-one/harmony/crypto/bls"
+	"math/big"
+
+	common2 "github.com/ethereum/go-ethereum/common"
+	bls_core "github.com/harmony-one/bls/ffi/go/bls"
+	"github.com/harmony-one/harmony/crypto/hash"
+	"github.com/harmony-one/harmony/internal/common"
+
+	staking "github.com/harmony-one/harmony/staking/types"
+)
+
+var (
+	validatorAddress = common2.Address(common.MustBech32ToAddress("one1pdv9lrdwl0rg5vglh4xtyrv3wjk3wsqket7zxy"))
+
+	testBLSPubKey    = "30b2c38b1316da91e068ac3bd8751c0901ef6c02a1d58bc712104918302c6ed03d5894671d0c816dad2b4d303320f202"
+	testBLSPrvKey    = "c6d7603520311f7a4e6aac0b26701fc433b75b38df504cd416ef2b900cd66205"
+	postStakingEpoch = big.NewInt(200)
+)
+
+func init() {
+	bls_core.Init(bls_core.BLS12_381)
+}
+
+func generateBLSKeySigPair() (bls.SerializedPublicKey, bls.SerializedSignature) {
+	p := &bls_core.PublicKey{}
+	p.DeserializeHexStr(testBLSPubKey)
+	pub := bls.SerializedPublicKey{}
+	pub.FromLibBLSPublicKey(p)
+	messageBytes := []byte(staking.BLSVerificationStr)
+	privateKey := &bls_core.SecretKey{}
+	privateKey.DeserializeHexStr(testBLSPrvKey)
+	msgHash := hash.Keccak256(messageBytes)
+	signature := privateKey.SignHash(msgHash[:])
+	var sig bls.SerializedSignature
+	copy(sig[:], signature.Serialize())
+	return pub, sig
+}
+
+func main() {
+	pri1 := bls.RandPrivateKey()
+	pri2 := bls.RandPrivateKey()
+	pri3 := bls.RandPrivateKey()
+	pri4 := bls.RandPrivateKey()
+
+	pub1 := pri1.GetPublicKey()
+	pub2 := pri2.GetPublicKey()
+	pub3 := pri3.GetPublicKey()
+	pub4 := pri4.GetPublicKey()
+
+	w1 := bls.PublicKeyWrapper{Object: pub1}
+	w1.Bytes.FromLibBLSPublicKey(w1.Object)
+
+	w2 := bls.PublicKeyWrapper{Object: pub2}
+	w2.Bytes.FromLibBLSPublicKey(w2.Object)
+
+	w3 := bls.PublicKeyWrapper{Object: pub3}
+	w3.Bytes.FromLibBLSPublicKey(w3.Object)
+
+	w4 := bls.PublicKeyWrapper{Object: pub4}
+	w4.Bytes.FromLibBLSPublicKey(w4.Object)
+
+	wrappers := []bls.PublicKeyWrapper{w1, w2, w3, w4}
+
+	bls.NewMask(wrappers, nil)
+
+	messageBytes := []byte(staking.BLSVerificationStr)
+	msgHash := hash.Keccak256(messageBytes)
+
+	s1 := pri1.SignHash(msgHash)
+	//s2 := pri2.SignHash(msgHash)
+	//s3 := pri3.SignHash(msgHash)
+	//s4 := pri4.SignHash(msgHash)
+
+	var aggregatedSig bls_core.Sign
+	aggregatedSig.Add(s1)
+
+	aggPub := &bls_core.PublicKey{}
+
+	aggPub.Add(pub1)
+
+	fmt.Println(aggregatedSig.VerifyHash(pub1, msgHash))
+}
diff --git a/test/chain/main.go b/test/chain/main.go
index f4e43c962..879f7e8d0 100644
--- a/test/chain/main.go
+++ b/test/chain/main.go
@@ -126,8 +126,12 @@ func fundFaucetContract(chain *core.BlockChain) {
 	if err != nil {
 		fmt.Println(err)
 	}
+	commitSigs := make(chan []byte)
+	go func() {
+		commitSigs <- []byte{}
+	}()
 	block, _ := contractworker.
-		FinalizeNewBlock([]byte{}, []byte{}, 0, common.Address{}, nil, nil)
+		FinalizeNewBlock(commitSigs, 0, common.Address{}, nil, nil)
 	_, err = chain.InsertChain(types.Blocks{block}, true /* verifyHeaders */)
 	if err != nil {
 		fmt.Println(err)
@@ -171,8 +175,12 @@ func callFaucetContractToFundAnAddress(chain *core.BlockChain) {
 	if err != nil {
 		fmt.Println(err)
 	}
+	commitSigs := make(chan []byte)
+	go func() {
+		commitSigs <- []byte{}
+	}()
 	block, _ := contractworker.FinalizeNewBlock(
-		[]byte{}, []byte{}, 0, common.Address{}, nil, nil,
+		commitSigs, 0, common.Address{}, nil, nil,
 	)
 	_, err = chain.InsertChain(types.Blocks{block}, true /* verifyHeaders */)
 	if err != nil {