diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 93b4e5d70..d87708b43 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -102,10 +102,10 @@ public:
         consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1517356801; // January 31st, 2018
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000002ebcfe2dd9eff82666");
+        consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000000c1bfe2bbe614f41260");
 
         // By default assume that the signatures in ancestors of this block are valid.
-        consensus.defaultAssumeValid = uint256S("0x59c9b9d3fec105bdc716d84caa7579503d5b05b73618d0bf2d5fa639f780a011"); //1353397
+        consensus.defaultAssumeValid = uint256S("0x66f49ad85624c33e4fd61aa45c54012509ed4a53308908dd07f56346c7939273"); //1441280
 
         /**
          * The message start string is designed to be unlikely to occur in normal data.
@@ -212,10 +212,10 @@ public:
         consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1517356801; // January 31st, 2018
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000000000007d006a402163e");
+        consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000000000000001df7b5aa1700ce");
 
         // By default assume that the signatures in ancestors of this block are valid.
-        consensus.defaultAssumeValid = uint256S("0xa0afbded94d4be233e191525dc2d467af5c7eab3143c852c3cd549831022aad6"); //343833
+        consensus.defaultAssumeValid = uint256S("0x1efb29c8187d5a496a33377941d1df415169c3ce5d8c05d055f25b683ec3f9a3"); //612653
 
         pchMessageStart[0] = 0xfd;
         pchMessageStart[1] = 0xd2;