diff --git a/cmd/puppeth/wizard_genesis.go b/cmd/puppeth/wizard_genesis.go
index 799384985a..89423e8b55 100644
--- a/cmd/puppeth/wizard_genesis.go
+++ b/cmd/puppeth/wizard_genesis.go
@@ -103,6 +103,10 @@ func (w *wizard) makeGenesis() {
 			copy(genesis.ExtraData[32+i*common.AddressLength:], signer[:])
 		}
 
+		fmt.Println()
+		fmt.Println("How many blocks per checkpoint? (default = 990)")
+		genesis.Config.Clique.RewardCheckpoint = uint64(w.readDefaultInt(990))
+
 	default:
 		log.Crit("Invalid consensus engine choice", "choice", choice)
 	}
diff --git a/cmd/tomo/main.go b/cmd/tomo/main.go
index fd2bcde89c..756869d5de 100644
--- a/cmd/tomo/main.go
+++ b/cmd/tomo/main.go
@@ -29,6 +29,7 @@ import (
 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/console"
+	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/ethclient"
 	"github.com/ethereum/go-ethereum/internal/debug"
@@ -287,19 +288,66 @@ func startNode(ctx *cli.Context, stack *node.Node) {
 		if err := stack.Service(&ethereum); err != nil {
 			utils.Fatalf("Ethereum service not running: %v", err)
 		}
-		// Use a reduced number of threads if requested
-		if threads := ctx.GlobalInt(utils.MinerThreadsFlag.Name); threads > 0 {
-			type threaded interface {
-				SetThreads(threads int)
+		go func() {
+			started := false
+			ok, err := ethereum.ValidateMiner()
+			if err != nil {
+				utils.Fatalf("Can't verify validator permission: %v", err)
 			}
-			if th, ok := ethereum.Engine().(threaded); ok {
-				th.SetThreads(threads)
+			if ok {
+				log.Info("Validator found. Enabling mining mode...")
+				// Use a reduced number of threads if requested
+				if threads := ctx.GlobalInt(utils.MinerThreadsFlag.Name); threads > 0 {
+					type threaded interface {
+						SetThreads(threads int)
+					}
+					if th, ok := ethereum.Engine().(threaded); ok {
+						th.SetThreads(threads)
+					}
+				}
+				// Set the gas price to the limits from the CLI and start mining
+				ethereum.TxPool().SetGasPrice(utils.GlobalBig(ctx, utils.GasPriceFlag.Name))
+				if err := ethereum.StartMining(true); err != nil {
+					utils.Fatalf("Failed to start mining: %v", err)
+				}
+				started = true
+				log.Info("Enabled mining node!!!")
 			}
-		}
-		// Set the gas price to the limits from the CLI and start mining
-		ethereum.TxPool().SetGasPrice(utils.GlobalBig(ctx, utils.GasPriceFlag.Name))
-		if err := ethereum.StartMining(true); err != nil {
-			utils.Fatalf("Failed to start mining: %v", err)
-		}
+			defer close(core.Checkpoint)
+
+			for range core.Checkpoint {
+				log.Info("Checkpoint!!! It's time to reconcile node's state...")
+				ok, err := ethereum.ValidateMiner()
+				if err != nil {
+					utils.Fatalf("Can't verify validator permission: %v", err)
+				}
+				if !ok {
+					log.Info("Only validator can mine blocks. Cancelling mining on this node...")
+					if started {
+						ethereum.StopMining()
+						started = false
+					}
+					log.Info("Cancelled mining mode!!!")
+				} else if !started {
+					log.Info("Validator found. Enabling mining mode...")
+					// Use a reduced number of threads if requested
+					if threads := ctx.GlobalInt(utils.MinerThreadsFlag.Name); threads > 0 {
+						type threaded interface {
+							SetThreads(threads int)
+						}
+						if th, ok := ethereum.Engine().(threaded); ok {
+							th.SetThreads(threads)
+						}
+					}
+					// Set the gas price to the limits from the CLI and start mining
+					ethereum.TxPool().SetGasPrice(utils.GlobalBig(ctx, utils.GasPriceFlag.Name))
+					if err := ethereum.StartMining(true); err != nil {
+						utils.Fatalf("Failed to start mining: %v", err)
+					}
+					started = true
+					log.Info("Enabled mining node!!!")
+				}
+			}
+		}()
 	}
 }
diff --git a/consensus/clique/clique.go b/consensus/clique/clique.go
index 2aa4648552..f5b4ef1972 100644
--- a/consensus/clique/clique.go
+++ b/consensus/clique/clique.go
@@ -25,6 +25,7 @@ import (
 	"sync"
 	"time"
 
+	"encoding/json"
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
@@ -39,7 +40,7 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/rpc"
-	lru "github.com/hashicorp/golang-lru"
+	"github.com/hashicorp/golang-lru"
 )
 
 const (
@@ -47,7 +48,8 @@ const (
 	inmemorySnapshots  = 128  // Number of recent vote snapshots to keep in memory
 	inmemorySignatures = 4096 // Number of recent block signatures to keep in memory
 
-	wiggleTime = 500 * time.Millisecond // Random delay (per signer) to allow concurrent signers
+	wiggleTime      = 500 * time.Millisecond // Random delay (per signer) to allow concurrent signers
+	genesisCoinBase = "0x0000000000000000000000000000000000000000"
 )
 
 // Clique proof-of-authority protocol constants.
@@ -277,9 +279,6 @@ func (c *Clique) verifyHeader(chain consensus.ChainReader, header *types.Header,
 	}
 	// Checkpoint blocks need to enforce zero beneficiary
 	checkpoint := (number % c.config.Epoch) == 0
-	if checkpoint && header.Coinbase != (common.Address{}) {
-		return errInvalidCheckpointBeneficiary
-	}
 	// Nonces must be 0x00..0 or 0xff..f, zeroes enforced on checkpoints
 	if !bytes.Equal(header.Nonce[:], nonceAuthVote) && !bytes.Equal(header.Nonce[:], nonceDropVote) {
 		return errInvalidVote
@@ -367,6 +366,41 @@ func (c *Clique) verifyCascadingFields(chain consensus.ChainReader, header *type
 	return c.verifySeal(chain, header, parents)
 }
 
+func (c *Clique) GetSnapshot(chain consensus.ChainReader, header *types.Header) (*Snapshot, error) {
+	number := header.Number.Uint64()
+	log.Trace("take snapshot", "number", number, "hash", header.Hash())
+	snap, err := c.snapshot(chain, number, header.Hash(), nil)
+	if err != nil {
+		return nil, err
+	}
+	return snap, nil
+}
+
+func position(list []common.Address, x common.Address) int {
+	for i, item := range list {
+		if item == x {
+			return i
+		}
+	}
+	return -1
+}
+
+func YourTurn(snap *Snapshot, header *types.Header, cur common.Address) (bool, error) {
+	if header.Number.Uint64() == 0 {
+		// Not check signer for genesis block.
+		return true, nil
+	}
+
+	pre, err := ecrecover(header, snap.sigcache)
+	if err != nil {
+		return false, err
+	}
+	preIndex := position(snap.signers(), pre)
+	curIndex := position(snap.signers(), cur)
+	log.Info("Debugging info", "number of masternodes", len(snap.signers()), "previous", pre, "position", preIndex, "current", cur, "position", curIndex)
+	return (preIndex+1)%len(snap.signers()) == curIndex, nil
+}
+
 // snapshot retrieves the authorization snapshot at a given point in time.
 func (c *Clique) snapshot(chain consensus.ChainReader, number uint64, hash common.Hash, parents []*types.Header) (*Snapshot, error) {
 	// Search for a snapshot in memory or on disk for checkpoints
@@ -572,10 +606,9 @@ func (c *Clique) Prepare(chain consensus.ChainReader, header *types.Header) erro
 func (c *Clique) Finalize(chain consensus.ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction, uncles []*types.Header, receipts []*types.Receipt) (*types.Block, error) {
 	// set block reward
 	// FIXME: unit Ether could be too plump
-	chainReward := new(big.Int).SetUint64(chain.Config().Clique.Reward * params.Ether)
-
-	reward := new(big.Int).Set(chainReward)
-	state.AddBalance(header.Coinbase, reward)
+	if err := c.accumulateRewards(chain, state, header); err != nil {
+		return nil, err
+	}
 
 	// No block rewards in PoA, so the state remains as is and uncles are dropped
 	header.Root = state.IntermediateRoot(chain.Config().IsEIP158(header.Number))
@@ -690,3 +723,55 @@ func (c *Clique) APIs(chain consensus.ChainReader) []rpc.API {
 		Public:    false,
 	}}
 }
+
+func (c *Clique) accumulateRewards(chain consensus.ChainReader, state *state.StateDB, header *types.Header) error {
+	type rewardLog struct {
+		Sign   uint64  `json:"sign"`
+		Reward float64 `json:"reward"`
+	}
+
+	number := header.Number.Uint64()
+	rCheckpoint := chain.Config().Clique.RewardCheckpoint
+
+	if number > 0 && rCheckpoint > 0 && number%rCheckpoint == 0 {
+		// Not reward for singer of genesis block and only calculate reward at checkpoint block.
+		parentHeader := chain.GetHeaderByHash(header.ParentHash)
+		startBlockNumber := number - rCheckpoint + 1
+		endBlockNumber := parentHeader.Number.Uint64()
+		signers := make(map[common.Address]*rewardLog)
+		totalSigner := uint64(0)
+
+		for i := startBlockNumber; i <= endBlockNumber; i++ {
+			blockHeader := chain.GetHeaderByNumber(i)
+			if signer, err := ecrecover(blockHeader, c.signatures); err != nil {
+				return err
+			} else {
+				_, exist := signers[signer]
+				if exist {
+					signers[signer].Sign++
+				} else {
+					signers[signer] = &rewardLog{1, 0}
+				}
+				totalSigner++
+			}
+		}
+
+		chainReward := new(big.Int).SetUint64(chain.Config().Clique.Reward * params.Ether)
+		// Update balance reward.
+		calcReward := new(big.Int)
+		for signer, rLog := range signers {
+			calcReward.Mul(chainReward, new(big.Int).SetUint64(rLog.Sign))
+			calcReward.Div(calcReward, new(big.Int).SetUint64(totalSigner))
+			rLog.Reward = float64(calcReward.Int64())
+
+			state.AddBalance(signer, calcReward)
+		}
+		jsonSigners, err := json.Marshal(signers)
+		if err != nil {
+			return err
+		}
+		log.Info("TOMO - Calculate reward at checkpoint", "startBlock", startBlockNumber, "endBlock", endBlockNumber, "signers", string(jsonSigners), "totalSigner", totalSigner, "totalReward", chainReward)
+	}
+
+	return nil
+}
diff --git a/core/blockchain.go b/core/blockchain.go
index b33eb85a44..1d55df9394 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -47,8 +47,8 @@ import (
 
 var (
 	blockInsertTimer = metrics.NewRegisteredTimer("chain/inserts", nil)
-
-	ErrNoGenesis = errors.New("Genesis not found in chain")
+	Checkpoint       = make(chan int)
+	ErrNoGenesis     = errors.New("Genesis not found in chain")
 )
 
 const (
@@ -1185,6 +1185,11 @@ func (bc *BlockChain) insertChain(chain types.Blocks) (int, []interface{}, []*ty
 		stats.processed++
 		stats.usedGas += usedGas
 		stats.report(chain, i, bc.stateCache.TrieDB().Size())
+		if i == len(chain)-1 {
+			if (bc.chainConfig.Clique != nil) && (chain[i].NumberU64()%bc.chainConfig.Clique.Epoch) == 0 {
+				Checkpoint <- 1
+			}
+		}
 	}
 	// Append a single chain head event if we've progressed the chain
 	if lastCanon != nil && bc.CurrentBlock().Hash() == lastCanon.Hash() {
diff --git a/eth/backend.go b/eth/backend.go
index 94aad23101..9f31f935c6 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -334,6 +334,29 @@ func (self *Ethereum) SetEtherbase(etherbase common.Address) {
 	self.miner.SetEtherbase(etherbase)
 }
 
+// ValidateMiner checks if node's address is in set of validators
+func (s *Ethereum) ValidateMiner() (bool, error) {
+	eb, err := s.Etherbase()
+	if err != nil {
+		return false, err
+	}
+	if s.chainConfig.Clique != nil {
+		//check if miner's wallet is in set of validators
+		c := s.engine.(*clique.Clique)
+		snap, err := c.GetSnapshot(s.blockchain, s.blockchain.CurrentHeader())
+		if err != nil {
+			return false, fmt.Errorf("Can't verify miner: %v", err)
+		}
+		if _, authorized := snap.Signers[eb]; !authorized {
+			//This miner doesn't belong to set of validators
+			return false, nil
+		}
+	} else {
+		return false, fmt.Errorf("Only verify miners in Clique protocol")
+	}
+	return true, nil
+}
+
 func (s *Ethereum) StartMining(local bool) error {
 	eb, err := s.Etherbase()
 	if err != nil {
diff --git a/miner/worker.go b/miner/worker.go
index 15395ae0b9..fdd69a0301 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -26,6 +26,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/consensus"
+	"github.com/ethereum/go-ethereum/consensus/clique"
 	"github.com/ethereum/go-ethereum/consensus/misc"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/state"
@@ -397,6 +398,29 @@ func (self *worker) commitNewWork() {
 	tstart := time.Now()
 	parent := self.chain.CurrentBlock()
 
+	// Only try to commit new work if we are mining
+	if atomic.LoadInt32(&self.mining) == 1 {
+		// check if we are right after parent's coinbase in the list
+		// only go with Clique
+		if self.config.Clique != nil {
+			c := self.engine.(*clique.Clique)
+			snap, err := c.GetSnapshot(self.chain, parent.Header())
+			if err != nil {
+				log.Error("Failed when trying to commit new work", "err", err)
+				return
+			}
+			ok, err := clique.YourTurn(snap, parent.Header(), self.coinbase)
+			if err != nil {
+				log.Error("Failed when trying to commit new work", "err", err)
+				return
+			}
+			if !ok {
+				log.Info("Not our turn to commit block. Wait for next time")
+				return
+			}
+		}
+	}
+
 	tstamp := tstart.Unix()
 	if parent.Time().Cmp(new(big.Int).SetInt64(tstamp)) >= 0 {
 		tstamp = parent.Time().Int64() + 1
@@ -488,6 +512,9 @@ func (self *worker) commitNewWork() {
 		log.Info("Commit new mining work", "number", work.Block.Number(), "txs", work.tcount, "uncles", len(uncles), "elapsed", common.PrettyDuration(time.Since(tstart)))
 		self.unconfirmed.Shift(work.Block.NumberU64() - 1)
 	}
+	if (work.config.Clique != nil) && (work.Block.NumberU64()%work.config.Clique.Epoch) == 0 {
+		core.Checkpoint <- 1
+	}
 	self.push(work)
 }
 
diff --git a/params/config.go b/params/config.go
index 868ed1ff84..e6ce0828d5 100644
--- a/params/config.go
+++ b/params/config.go
@@ -133,9 +133,10 @@ func (c *EthashConfig) String() string {
 
 // CliqueConfig is the consensus engine configs for proof-of-authority based sealing.
 type CliqueConfig struct {
-	Period uint64 `json:"period"` // Number of seconds between blocks to enforce
-	Epoch  uint64 `json:"epoch"`  // Epoch length to reset votes and checkpoint
-	Reward uint64 `json:"reward"` // Block reward - unit Ether
+	Period           uint64 `json:"period"`           // Number of seconds between blocks to enforce
+	Epoch            uint64 `json:"epoch"`            // Epoch length to reset votes and checkpoint
+	Reward           uint64 `json:"reward"`           // Block reward - unit Ether
+	RewardCheckpoint uint64 `json:"rewardCheckpoint"` // Checkpoint block for calculate rewards.
 }
 
 // String implements the stringer interface, returning the consensus engine details.