diff --git a/XDCx/XDCx.go b/XDCx/XDCx.go
index 9762bf6b50..2a8d9b299a 100644
--- a/XDCx/XDCx.go
+++ b/XDCx/XDCx.go
@@ -572,6 +572,9 @@ func (XDCx *XDCX) GetTradingState(block *types.Block, author common.Address) (*t
 	}
 	return tradingstate.New(root, XDCx.StateCache)
 }
+func (XDCX *XDCX) GetEmptyTradingState() (*tradingstate.TradingStateDB, error) {
+	return tradingstate.New(tradingstate.EmptyRoot, XDCX.StateCache)
+}
 
 func (XDCx *XDCX) GetStateCache() tradingstate.Database {
 	return XDCx.StateCache
diff --git a/common/constants.go b/common/constants.go
index 2972277f2a..fdbbdfc742 100644
--- a/common/constants.go
+++ b/common/constants.go
@@ -24,7 +24,7 @@ const (
 	MergeSignRange             = 15
 	RangeReturnSigner          = 150
 	MinimunMinerBlockPerEpoch  = 1
-	IgnoreSignerCheckBlock     = uint64(27307800)
+
 	OneYear                    = uint64(365 * 86400)
 	LiquidateLendingTradeBlock = uint64(100)
 )
@@ -36,14 +36,14 @@ var TIPSigning = big.NewInt(3000000)
 var TIPRandomize = big.NewInt(3464000)
 
 var TIPIncreaseMasternodes = big.NewInt(5000000) // Upgrade MN Count at Block.
-var TIPNoHalvingMNReward = big.NewInt(23779191)  // hardfork no halving masternodes reward
-var BlackListHFNumber = uint64(23779191)
-var TIPXDCX = big.NewInt(23779191)
-var TIPXDCXLending = big.NewInt(23779191)
-var TIPXDCXCancellationFee = big.NewInt(23779191)
-var TIPXDCXCancellationFeeTestnet = big.NewInt(23779191)
+var TIPNoHalvingMNReward = big.NewInt(38383838)  // hardfork no halving masternodes reward
+var BlackListHFNumber = uint64(38383838)
+var TIPXDCX = big.NewInt(38383838)
+var TIPXDCXLending = big.NewInt(38383838)
+var TIPXDCXCancellationFee = big.NewInt(38383838)
+var TIPXDCXCancellationFeeTestnet = big.NewInt(38383838)
 
-var TIPXDCXTestnet = big.NewInt(23779191)
+var TIPXDCXTestnet = big.NewInt(38383838)
 var IsTestnet bool = false
 var StoreRewardFolder string
 var RollbackHash Hash
@@ -71,9 +71,16 @@ var TRC21GasPrice = big.NewInt(250000000)
 var RateTopUp = big.NewInt(90) // 90%
 var BaseTopUp = big.NewInt(100)
 var BaseRecall = big.NewInt(100)
-var TIPTRC21Fee = big.NewInt(23779191)
-var TIPTRC21FeeTestnet = big.NewInt(23779191)
+var TIPTRC21Fee = big.NewInt(38383838)
+var TIPTRC21FeeTestnet = big.NewInt(38383838)
 var LimitTimeFinality = uint64(30) // limit in 30 block
+
+var IgnoreSignerCheckBlockArray = map[uint64]bool{
+	uint64(1032300):  true,
+	uint64(1033200):  true,
+	uint64(27307800): true,
+	uint64(28270800): true,
+}
 var Blacklist = map[Address]bool{
 	HexToAddress("0x5248bfb72fd4f234e062d3e9bb76f08643004fcd"): true,
 	HexToAddress("0x5ac26105b35ea8935be382863a70281ec7a985e9"): true,
diff --git a/consensus/XDPoS/engines/engine_v1/engine.go b/consensus/XDPoS/engines/engine_v1/engine.go
index 16c8bdb441..c5e7aaf0be 100644
--- a/consensus/XDPoS/engines/engine_v1/engine.go
+++ b/consensus/XDPoS/engines/engine_v1/engine.go
@@ -274,8 +274,8 @@ func (x *XDPoS_v1) verifyCascadingFields(chain consensus.ChainReader, header *ty
 
 func (x *XDPoS_v1) checkSignersOnCheckpoint(chain consensus.ChainReader, header *types.Header, signers []common.Address) error {
 	number := header.Number.Uint64()
-	// ignore signerCheck at checkpoint block 14458500 due to wrong snapshot at gap 14458495
-	if number == common.IgnoreSignerCheckBlock {
+	// ignore signerCheck at checkpoint block.
+	if common.IgnoreSignerCheckBlockArray[number] {
 		return nil
 	}
 	penPenalties := []common.Address{}
diff --git a/consensus/XDPoS/utils/types.go b/consensus/XDPoS/utils/types.go
index 754194c728..4f55973cfd 100644
--- a/consensus/XDPoS/utils/types.go
+++ b/consensus/XDPoS/utils/types.go
@@ -22,6 +22,7 @@ type Masternode struct {
 type TradingService interface {
 	GetTradingStateRoot(block *types.Block, author common.Address) (common.Hash, error)
 	GetTradingState(block *types.Block, author common.Address) (*tradingstate.TradingStateDB, error)
+	GetEmptyTradingState() (*tradingstate.TradingStateDB, error)
 	HasTradingState(block *types.Block, author common.Address) bool
 	GetStateCache() tradingstate.Database
 	GetTriegc() *prque.Prque
diff --git a/contracts/validator/contract/XDCValidator.sol b/contracts/validator/contract/XDCValidator.sol
index 34d8b4e51b..0e67746a17 100644
--- a/contracts/validator/contract/XDCValidator.sol
+++ b/contracts/validator/contract/XDCValidator.sol
@@ -1,7 +1,9 @@
+
 pragma solidity ^0.4.21;
 
 import "./libs/SafeMath.sol";
 
+
 contract XDCValidator {
     using SafeMath for uint256;
 
@@ -10,6 +12,8 @@ contract XDCValidator {
     event Propose(address _owner, address _candidate, uint256 _cap);
     event Resign(address _owner, address _candidate);
     event Withdraw(address _owner, uint256 _blockNumber, uint256 _cap);
+    event UploadedKYC(address _owner,string kycHash);
+    event InvalidatedNode(address _masternodeOwner, address[] _masternodes);
 
     struct ValidatorState {
         address owner;
@@ -27,9 +31,18 @@ contract XDCValidator {
 
     mapping(address => ValidatorState) validatorsState;
     mapping(address => address[]) voters;
+
+    // Mapping structures added for KYC feature.
+    mapping(address => string[]) public KYCString;
+    mapping(address => uint) public invalidKYCCount;
+    mapping(address => mapping(address => bool)) public hasVotedInvalid;
+    mapping(address => address[]) public ownerToCandidate;
+    address[] public owners;
+
     address[] public candidates;
 
     uint256 public candidateCount = 0;
+    uint256 public ownerCount =0;
     uint256 public minCandidateCap;
     uint256 public minVoterCap;
     uint256 public maxValidatorNumber;
@@ -43,10 +56,16 @@ contract XDCValidator {
     }
 
     modifier onlyValidVoterCap {
+
         require(msg.value >= minVoterCap);
         _;
     }
 
+    modifier onlyKYCWhitelisted {
+       require(KYCString[msg.sender].length!=0 || ownerToCandidate[msg.sender].length>0);
+       _;
+    }
+
     modifier onlyOwner(address _candidate) {
         require(validatorsState[_candidate].owner == msg.sender);
         _;
@@ -99,7 +118,8 @@ contract XDCValidator {
         candidateWithdrawDelay = _candidateWithdrawDelay;
         voterWithdrawDelay = _voterWithdrawDelay;
         candidateCount = _candidates.length;
-
+        owners.push(_firstOwner);
+        ownerCount++;
         for (uint256 i = 0; i < _candidates.length; i++) {
             candidates.push(_candidates[i]);
             validatorsState[_candidates[i]] = ValidatorState({
@@ -108,11 +128,20 @@ contract XDCValidator {
                 cap: _caps[i]
             });
             voters[_candidates[i]].push(_firstOwner);
+            ownerToCandidate[_firstOwner].push(_candidates[i]);
             validatorsState[_candidates[i]].voters[_firstOwner] = minCandidateCap;
         }
     }
 
-    function propose(address _candidate) external payable onlyValidCandidateCap onlyNotCandidate(_candidate) {
+
+    // uploadKYC : anyone can upload a KYC; its not equivalent to becoming an owner.
+    function uploadKYC(string kychash) external {
+        KYCString[msg.sender].push(kychash);
+        emit UploadedKYC(msg.sender,kychash);
+    }
+
+    // propose : any non-candidate who has uploaded its KYC can become an owner by proposing a candidate.
+    function propose(address _candidate) external payable onlyValidCandidateCap onlyKYCWhitelisted onlyNotCandidate(_candidate) {
         uint256 cap = validatorsState[_candidate].cap.add(msg.value);
         candidates.push(_candidate);
         validatorsState[_candidate] = ValidatorState({
@@ -122,6 +151,11 @@ contract XDCValidator {
         });
         validatorsState[_candidate].voters[msg.sender] = validatorsState[_candidate].voters[msg.sender].add(msg.value);
         candidateCount = candidateCount.add(1);
+        if (ownerToCandidate[msg.sender].length ==0){
+            owners.push(msg.sender);
+            ownerCount++;
+        }
+        ownerToCandidate[msg.sender].push(_candidate);
         voters[_candidate].push(msg.sender);
         emit Propose(msg.sender, _candidate, msg.value);
     }
@@ -198,6 +232,67 @@ contract XDCValidator {
         emit Resign(msg.sender, _candidate);
     }
 
+    // voteInvalidKYC : any candidate can vote for invalid KYC i.e. a particular candidate's owner has uploaded a bad KYC.
+    // On securing 75% votes against an owner ( not candidate ), owner & all its candidates will lose their funds.
+    function voteInvalidKYC(address _invalidCandidate) onlyValidCandidate(msg.sender) onlyValidCandidate(_invalidCandidate) public {
+        address candidateOwner = getCandidateOwner(msg.sender);
+        address _invalidMasternode = getCandidateOwner(_invalidCandidate);
+        require(!hasVotedInvalid[candidateOwner][_invalidMasternode]);
+        hasVotedInvalid[candidateOwner][_invalidMasternode] = true;
+        invalidKYCCount[_invalidMasternode] += 1;
+        if( invalidKYCCount[_invalidMasternode]*100/getOwnerCount() >= 75 ){
+            // 75% owners say that the KYC is invalid
+            address[] memory allMasternodes = new address[](candidates.length-1) ;
+            uint count=0;
+            for (uint i=0;i<candidates.length;i++){
+                if (getCandidateOwner(candidates[i])==_invalidMasternode){
+                    // logic to remove cap.
+                    candidateCount = candidateCount.sub(1);
+                    allMasternodes[count++] = candidates[i];
+                    delete candidates[i];
+                    delete validatorsState[candidates[i]];
+                    delete KYCString[_invalidMasternode];
+                    delete ownerToCandidate[_invalidMasternode];
+                    delete invalidKYCCount[_invalidMasternode];
+                }
+            }
+            for(uint k=0;k<owners.length;k++){
+                        if (owners[k]==_invalidMasternode){
+                            delete owners[k];
+                            ownerCount--;
+                            break;
+                } 
+            }
+            emit InvalidatedNode(_invalidMasternode,allMasternodes);
+        }
+    }
+
+    // invalidPercent : get votes against an owner in percentage.
+    function invalidPercent(address _invalidCandidate) onlyValidCandidate(_invalidCandidate) view public returns(uint){
+        address _invalidMasternode = getCandidateOwner(_invalidCandidate);
+        return (invalidKYCCount[_invalidMasternode]*100/getOwnerCount());
+    }
+
+
+    // getOwnerCount : get count of total owners; accounts who own atleast one masternode.
+    function getOwnerCount() view public returns (uint){
+        return ownerCount;
+    }
+    
+    // getKYC : get KYC uploaded of the owner of the given masternode or the owner themselves
+    function getLatestKYC(address _address) view public  returns (string) {
+        if(isCandidate(_address)){
+        return KYCString[getCandidateOwner(_address)][KYCString[getCandidateOwner(_address)].length-1];
+        }
+        else{
+            return KYCString[_address][KYCString[_address].length-1];
+        }
+    }
+    
+    function getHashCount(address _address) view public returns(uint){
+        return KYCString[_address].length;
+    }
+
     function withdraw(uint256 _blockNumber, uint _index) public onlyValidWithdraw(_blockNumber, _index) {
         uint256 cap = withdrawsState[msg.sender].caps[_blockNumber];
         delete withdrawsState[msg.sender].caps[_blockNumber];
diff --git a/contracts/validator/validator.go b/contracts/validator/validator.go
index e5dd8ad79e..5aa54967a0 100644
--- a/contracts/validator/validator.go
+++ b/contracts/validator/validator.go
@@ -16,10 +16,11 @@
 package validator
 
 import (
+	"math/big"
+
 	"github.com/XinFinOrg/XDPoSChain/accounts/abi/bind"
 	"github.com/XinFinOrg/XDPoSChain/common"
 	"github.com/XinFinOrg/XDPoSChain/contracts/validator/contract"
-	"math/big"
 )
 
 type Validator struct {
@@ -51,8 +52,8 @@ func DeployValidator(transactOpts *bind.TransactOpts, contractBackend bind.Contr
 	// Min Voter Cap 10 XDC
 	// 150 masternodes
 	// Candidate Delay Withdraw 30 days = 1296000 blocks
-	// Voter Delay Withdraw 2 days = 86400 blocks
-	validatorAddr, _, _, err := contract.DeployXDCValidator(transactOpts, contractBackend, validatorAddress, caps, ownerAddress, minDeposit, minVoterCap, big.NewInt(150), big.NewInt(1296000), big.NewInt(86400))
+	// Voter Delay Withdraw 10 days = 432000 blocks
+	validatorAddr, _, _, err := contract.DeployXDCValidator(transactOpts, contractBackend, validatorAddress, caps, ownerAddress, minDeposit, minVoterCap, big.NewInt(18), big.NewInt(1296000), big.NewInt(432000))
 	if err != nil {
 		return validatorAddr, nil, err
 	}
diff --git a/core/blockchain.go b/core/blockchain.go
index 940d53d4c3..9e4c84f5ca 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -519,6 +519,13 @@ func (bc *BlockChain) OrderStateAt(block *types.Block) (*tradingstate.TradingSta
 			} else {
 				return nil, err
 			}
+		} else {
+			XDCxState, err := XDCXService.GetEmptyTradingState()
+			if err == nil {
+				return XDCxState, nil
+			} else {
+				return nil, err
+			}
 		}
 	}
 	return nil, errors.New("Get XDCx state fail")
@@ -2428,26 +2435,21 @@ func (bc *BlockChain) UpdateM1() error {
 	}
 	opts := new(bind.CallOpts)
 
-	// var candidates []common.Address
-	// // get candidates from slot of stateDB
-	// // if can't get anything, request from contracts
-	// stateDB, err := bc.State()
-	// if err != nil {
-
-	// 	candidates, err = validator.GetCandidates(opts)
-	// 	if err != nil {
-
-	// 		return err
-	// 	}
-	// } else {
-
-	// 	candidates = state.GetCandidates(stateDB)
-
-	// }
-
-	candidates, err := validator.GetCandidates(opts)
+	var candidates []common.Address
+	// get candidates from slot of stateDB
+	// if can't get anything, request from contracts
+	stateDB, err := bc.State()
 	if err != nil {
-		return err
+
+		candidates, err = validator.GetCandidates(opts)
+		if err != nil {
+
+			return err
+		}
+	} else {
+
+		candidates = state.GetCandidates(stateDB)
+
 	}
 
 	var ms []utils.Masternode
@@ -2487,7 +2489,7 @@ func (bc *BlockChain) UpdateM1() error {
 			maxMasternodes = common.MaxMasternodes
 		}
 		if len(ms) > maxMasternodes {
-			err = engine.UpdateMasternodes(bc, bc.CurrentHeader(), ms[:common.MaxMasternodes])
+			err = engine.UpdateMasternodes(bc, bc.CurrentHeader(), ms[:maxMasternodes])
 		} else {
 			err = engine.UpdateMasternodes(bc, bc.CurrentHeader(), ms)
 		}
diff --git a/core/blockchain_test.go b/core/blockchain_test.go
index e70ffe3ef8..9dc4b65117 100644
--- a/core/blockchain_test.go
+++ b/core/blockchain_test.go
@@ -18,13 +18,14 @@ package core
 
 import (
 	"fmt"
-	"github.com/XinFinOrg/XDPoSChain/core/rawdb"
 	"math/big"
 	"math/rand"
 	"sync"
 	"testing"
 	"time"
 
+	"github.com/XinFinOrg/XDPoSChain/core/rawdb"
+
 	"github.com/XinFinOrg/XDPoSChain/common"
 	"github.com/XinFinOrg/XDPoSChain/consensus/ethash"
 	"github.com/XinFinOrg/XDPoSChain/core/state"
@@ -1323,7 +1324,7 @@ func TestLargeReorgTrieGC(t *testing.T) {
 }
 
 /*
-	Collection test for BlochsHashCache
+	Collection test for BlocksHashCache
 	cases
 		1. When init new chain
 		2. when insertChain
diff --git a/core/state/statedb_utils.go b/core/state/statedb_utils.go
index 694bcdd127..4a0c9d45e6 100644
--- a/core/state/statedb_utils.go
+++ b/core/state/statedb_utils.go
@@ -73,8 +73,14 @@ var (
 		"withdrawsState":         0,
 		"validatorsState":        1,
 		"voters":                 2,
+		"KYCString":              3,
+		"invalidKYCCount":        4,
+		"hasVotedInvalid":        5,
+		"ownerToCandidate":       6,
+		"owners":                 7,
 		"candidates":             8,
 		"candidateCount":         9,
+		"ownerCount":             10,
 		"minCandidateCap":        11,
 		"minVoterCap":            12,
 		"maxValidatorNumber":     13,
diff --git a/eth/api.go b/eth/api.go
index f6e4232356..9f12db9ec2 100644
--- a/eth/api.go
+++ b/eth/api.go
@@ -306,11 +306,7 @@ func NewPublicDebugAPI(eth *Ethereum) *PublicDebugAPI {
 // DumpBlock retrieves the entire state of the database at a given block.
 func (api *PublicDebugAPI) DumpBlock(blockNr rpc.BlockNumber) (state.Dump, error) {
 	if blockNr == rpc.PendingBlockNumber {
-		// If we're dumping the pending state, we need to request
-		// both the pending block as well as the pending state from
-		// the miner and operate on those
-		_, stateDb := api.eth.miner.Pending()
-		return stateDb.RawDump(), nil
+		blockNr = rpc.LatestBlockNumber
 	}
 	var block *types.Block
 	if blockNr == rpc.LatestBlockNumber {
diff --git a/eth/api_backend.go b/eth/api_backend.go
index e7c102f67e..9285afbac5 100644
--- a/eth/api_backend.go
+++ b/eth/api_backend.go
@@ -76,8 +76,7 @@ func (b *EthApiBackend) SetHead(number uint64) {
 func (b *EthApiBackend) HeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Header, error) {
 	// Pending block is only known by the miner
 	if blockNr == rpc.PendingBlockNumber {
-		block := b.eth.miner.PendingBlock()
-		return block.Header(), nil
+		blockNr = rpc.LatestBlockNumber
 	}
 	// Otherwise resolve and return the block
 	if blockNr == rpc.LatestBlockNumber {
@@ -89,8 +88,7 @@ func (b *EthApiBackend) HeaderByNumber(ctx context.Context, blockNr rpc.BlockNum
 func (b *EthApiBackend) BlockByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Block, error) {
 	// Pending block is only known by the miner
 	if blockNr == rpc.PendingBlockNumber {
-		block := b.eth.miner.PendingBlock()
-		return block, nil
+		blockNr = rpc.LatestBlockNumber
 	}
 	// Otherwise resolve and return the block
 	if blockNr == rpc.LatestBlockNumber {
@@ -102,8 +100,7 @@ func (b *EthApiBackend) BlockByNumber(ctx context.Context, blockNr rpc.BlockNumb
 func (b *EthApiBackend) StateAndHeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*state.StateDB, *types.Header, error) {
 	// Pending state is only known by the miner
 	if blockNr == rpc.PendingBlockNumber {
-		block, state := b.eth.miner.Pending()
-		return state, block.Header(), nil
+		blockNr = rpc.LatestBlockNumber
 	}
 	// Otherwise resolve the block number and return its state
 	header, err := b.HeaderByNumber(ctx, blockNr)
diff --git a/eth/api_tracer.go b/eth/api_tracer.go
index 752a92bd3e..aa4d74b7b2 100644
--- a/eth/api_tracer.go
+++ b/eth/api_tracer.go
@@ -21,13 +21,14 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"github.com/XinFinOrg/XDPoSChain/XDCx/tradingstate"
 	"io/ioutil"
 	"math/big"
 	"runtime"
 	"sync"
 	"time"
 
+	"github.com/XinFinOrg/XDPoSChain/XDCx/tradingstate"
+
 	"github.com/XinFinOrg/XDPoSChain/common"
 	"github.com/XinFinOrg/XDPoSChain/common/hexutil"
 	"github.com/XinFinOrg/XDPoSChain/core"
@@ -99,7 +100,7 @@ func (api *PrivateDebugAPI) TraceChain(ctx context.Context, start, end rpc.Block
 
 	switch start {
 	case rpc.PendingBlockNumber:
-		from = api.eth.miner.PendingBlock()
+		from = api.eth.blockchain.CurrentBlock()
 	case rpc.LatestBlockNumber:
 		from = api.eth.blockchain.CurrentBlock()
 	default:
@@ -107,7 +108,7 @@ func (api *PrivateDebugAPI) TraceChain(ctx context.Context, start, end rpc.Block
 	}
 	switch end {
 	case rpc.PendingBlockNumber:
-		to = api.eth.miner.PendingBlock()
+		to = api.eth.blockchain.CurrentBlock()
 	case rpc.LatestBlockNumber:
 		to = api.eth.blockchain.CurrentBlock()
 	default:
@@ -353,7 +354,7 @@ func (api *PrivateDebugAPI) TraceBlockByNumber(ctx context.Context, number rpc.B
 
 	switch number {
 	case rpc.PendingBlockNumber:
-		block = api.eth.miner.PendingBlock()
+		block = api.eth.blockchain.CurrentBlock()
 	case rpc.LatestBlockNumber:
 		block = api.eth.blockchain.CurrentBlock()
 	default:
@@ -514,7 +515,7 @@ func (api *PrivateDebugAPI) computeStateDB(block *types.Block, reexec uint64) (*
 			break
 		}
 		if statedb, err = state.New(block.Root(), database); err == nil {
-			XDCxState, err = tradingstate.New(block.Root(), tradingstate.NewDatabase(api.eth.XDCX.GetLevelDB()))
+			XDCxState, err = api.eth.blockchain.OrderStateAt(block)
 			if err == nil {
 				break
 			}
diff --git a/params/version.go b/params/version.go
index f9412f9e2a..c8d19d47bf 100644
--- a/params/version.go
+++ b/params/version.go
@@ -22,9 +22,9 @@ import (
 
 const (
 	VersionMajor = 1          // Major version component of the current release
-	VersionMinor = 3          // Minor version component of the current release
-	VersionPatch = 0          // Patch version component of the current release
-	VersionMeta  = "unstable" // Version metadata to append to the version string
+	VersionMinor = 4          // Minor version component of the current release
+	VersionPatch = 3          // Patch version component of the current release
+	VersionMeta  = "stable" // Version metadata to append to the version string
 )
 
 // Version holds the textual version string.