diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index df1ed4fd90..9403adb05b 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -71,10 +71,10 @@ class CMainParams : public CChainParams {
     CMainParams() {
         strNetworkID = "main";
         consensus.nSubsidyHalvingInterval = 840000;
-        consensus.BIP34Height = 690000;
+        consensus.BIP34Height = 664500;
         consensus.BIP34Hash = uint256S("0x000000000000024b89b42a942fe0d9fea3bb44ab7bd1b19115dd6a759c0808b8");
-        consensus.BIP65Height = 690000; // 000000000000000004c2b624ed5d7756c508d90fd0da2c7c679febfa6c4735f0
-        consensus.BIP66Height = 690000; // 00000000000000000379eaa19dce8c9b722d46ae6a57c2f1a988119488b50931
+        consensus.BIP65Height = 664510; // 000000000000000004c2b624ed5d7756c508d90fd0da2c7c679febfa6c4735f0
+        consensus.BIP66Height = 664520; // 00000000000000000379eaa19dce8c9b722d46ae6a57c2f1a988119488b50931
  	consensus.powLimit = uint256S("00000fffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
         consensus.nPowTargetTimespan = 3.5 * 24 * 60 * 60; // two weeks
         consensus.nPowTargetSpacing = 2.5 * 60;
@@ -85,21 +85,21 @@ class CMainParams : public CChainParams {
 	consensus.nKGWInterval = 12;
 	consensus.fRbfEnabled = false;
         consensus.fPowNoRetargeting = false;
-        consensus.nRuleChangeActivationThreshold = 1916; // 95% of 2016
-        consensus.nMinerConfirmationWindow = 2016; // nPowTargetTimespan / nPowTargetSpacing
+        consensus.nRuleChangeActivationThreshold = 750; // 95% of 1000
+        consensus.nMinerConfirmationWindow = 1000;
         consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
         consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime =  9999999999; //1199145601; // January 1, 2008
         consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 9999999999; //1230767999; // December 31, 2008
 
         // Deployment of BIP68, BIP112, and BIP113.
         consensus.vDeployments[Consensus::DEPLOYMENT_CSV].bit = 0;
-        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nStartTime = 9999999999; //1462060800; // May 1st, 2016
-        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = 9999999999; //1493596800; // May 1st, 2017
+        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nStartTime = 1486944000; //1462060800; // Feb 13th, 2017
+        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = 1487808000; //1493596800;   // Feb 23rd, 2017
 
         // Deployment of SegWit (BIP141, BIP143, and BIP147)
         consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].bit = 1;
-        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 9999999999; //1479168000; // November 15th, 2016.
-        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 9999999999; //1510704000; // November 15th, 2017.
+        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 1487894400; //1479168000; // Feb 24th. 2017
+        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1488499200; //1510704000;   // March 3rd. 2017  .
 
         // The best chain should have at least this much work.
         consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000002cb971dd56d1c583c20f90");