diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index d4d9944f4..1bba604ba 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("0x000000000000000000000000000000000000000000000006805c7318ce2736c0");
+        consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000002ebcfe2dd9eff82666");
 
         // By default assume that the signatures in ancestors of this block are valid.
-        consensus.defaultAssumeValid = uint256S("0x1673fa904a93848eca83d5ca82c7af974511a7e640e22edc2976420744f2e56a"); //1155631
+        consensus.defaultAssumeValid = uint256S("0x59c9b9d3fec105bdc716d84caa7579503d5b05b73618d0bf2d5fa639f780a011"); //1353397
 
         /**
          * The message start string is designed to be unlikely to occur in normal data.
@@ -168,9 +168,9 @@ public:
         };
 
         chainTxData = ChainTxData{
-            // Data as of block b44bc5ae41d1be67227ba9ad875d7268aa86c965b1d64b47c35be6e8d5c352f4 (height 1155626).
-            1487715936, // * UNIX timestamp of last known number of transactions
-            9243806,  // * total number of transactions between genesis and that timestamp
+            // Data as of block 59c9b9d3fec105bdc716d84caa7579503d5b05b73618d0bf2d5fa639f780a011 (height 1353397).
+            1516406833, // * UNIX timestamp of last known number of transactions
+            19831879,  // * total number of transactions between genesis and that timestamp
                     //   (the tx=... number in the SetBestChain debug.log lines)
             0.06     // * estimated number of transactions per second after that timestamp
         };
@@ -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("0x000000000000000000000000000000000000000000000000000000054cb9e7a0");
+        consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000000000007d006a402163e");
 
         // By default assume that the signatures in ancestors of this block are valid.
-        consensus.defaultAssumeValid = uint256S("0x43a16a626ef2ffdbe928f2bc26dcd5475c6a1a04f9542dfc6a0a88e5fcf9bd4c"); //8711
+        consensus.defaultAssumeValid = uint256S("0xa0afbded94d4be233e191525dc2d467af5c7eab3143c852c3cd549831022aad6"); //343833
 
         pchMessageStart[0] = 0xfd;
         pchMessageStart[1] = 0xd2;
@@ -258,9 +258,9 @@ public:
         };
 
         chainTxData = ChainTxData{
-            // Data as of block f2dc531da6be01f53774f970aaaca200c7a8317ee9fd398ee733b40f14e265d1 (height 8702)
-            1487715270,
-            8731,
+            // Data as of block a0afbded94d4be233e191525dc2d467af5c7eab3143c852c3cd549831022aad6 (height 343833)
+            1516406749,
+            794057,
             0.01
         };
 
diff --git a/src/qt/intro.cpp b/src/qt/intro.cpp
index c6c835bc9..f5023bf84 100644
--- a/src/qt/intro.cpp
+++ b/src/qt/intro.cpp
@@ -22,7 +22,7 @@
 
 static const uint64_t GB_BYTES = 1000000000LL;
 /* Minimum free space (in GB) needed for data directory */
-static const uint64_t BLOCK_CHAIN_SIZE = 8;
+static const uint64_t BLOCK_CHAIN_SIZE = 14;
 /* Minimum free space (in GB) needed for data directory when pruned; Does not include prune target */
 static const uint64_t CHAIN_STATE_SIZE = 3;
 /* Total required space (in GB) depending on user choice (prune, not prune) */