Merge #13794: chainparams: Update with data from assumed valid chain

fa8f2d8 doc: Fix chainTxData comment (MarcoFalke)
fa6094f chainparams: Update with data from assumed valid chain (MarcoFalke)

Pull request description:

  Can be reviewed by using the `getblock` and `getchaintxstats` rpcs of a synced node. Reviewers get extra points when their full node has checkpoints and assumevalid disabled.

Tree-SHA512: cedd61fde129ae4c16fc12275b61e4c5659b6d72dd801c608efc294188561bc986d94652fe9bea71ada48654258e2a074d2d2da78036c69608ccff3a6cc1ccf5

Author: laanwj

src/chainparams.cpp

@@ -102,10 +102,10 @@ class CMainParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1510704000; // November 15th, 2017.
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000000f91c579d57cad4bc5278cc");
+        consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000028822fef1c230963535a90d");
 
         // By default assume that the signatures in ancestors of this block are valid.
-        consensus.defaultAssumeValid = uint256S("0x0000000000000000005214481d2d96f898e3d5416e43359c145944a909d242e0"); //506067
+        consensus.defaultAssumeValid = uint256S("0x0000000000000000002e63058c023a9a1de233554f28c7b21380b6c9003f36a8"); //534292
 
         /**
          * The message start string is designed to be unlikely to occur in normal data.
@@ -170,11 +170,10 @@ class CMainParams : public CChainParams {
         };
 
         chainTxData = ChainTxData{
-            // Data as of block 0000000000000000002d6cca6761c99b3c2e936f9a0e304b7c7651a993f461de (height 506081).
-            1516903077, // * UNIX timestamp of last known number of transactions
-            295363220,  // * total number of transactions between genesis and that timestamp
-                        //   (the tx=... number in the ChainStateFlushed debug.log lines)
-            3.5         // * estimated number of transactions per second after that timestamp
+            // Data from rpc: getchaintxstats 4096 0000000000000000002e63058c023a9a1de233554f28c7b21380b6c9003f36a8
+            /* nTime    */ 1532884444,
+            /* nTxCount */ 331282217,
+            /* dTxRate  */ 2.4
         };
 
         /* disable fallback fee on mainnet */
@@ -217,10 +216,10 @@ class CTestNetParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1493596800; // May 1st 2017
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000002830dab7f76dbb7d63");
+        consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000007dbe94253893cbd463");
 
         // By default assume that the signatures in ancestors of this block are valid.
-        consensus.defaultAssumeValid = uint256S("0x0000000002e9e7b00e1f6dc5123a04aad68dd0f0968d8c7aa45f6640795c37b1"); //1135275
+        consensus.defaultAssumeValid = uint256S("0x0000000000000037a8cd3e06cd5edbfe9dd1dbcc5dacab279376ef7cfc2b4c75"); //1354312
 
         pchMessageStart[0] = 0x0b;
         pchMessageStart[1] = 0x11;
@@ -264,10 +263,10 @@ class CTestNetParams : public CChainParams {
         };
 
         chainTxData = ChainTxData{
-            // Data as of block 000000000000033cfa3c975eb83ecf2bb4aaedf68e6d279f6ed2b427c64caff9 (height 1260526)
-            1516903490,
-            17082348,
-            0.09
+            // Data from rpc: getchaintxstats 4096 0000000000000037a8cd3e06cd5edbfe9dd1dbcc5dacab279376ef7cfc2b4c75
+            /* nTime    */ 1531929919,
+            /* nTxCount */ 19438708,
+            /* dTxRate  */ 0.626
         };
 
         /* enable fallback fee on testnet */

src/chainparams.h

@@ -32,9 +32,9 @@ struct CCheckpointData {
  * See also: CChainParams::TxData, GuessVerificationProgress.
  */
 struct ChainTxData {
-    int64_t nTime;
-    int64_t nTxCount;
-    double dTxRate;
+    int64_t nTime;    //!< UNIX timestamp of last known number of transactions
+    int64_t nTxCount; //!< total number of transactions between genesis and that timestamp
+    double dTxRate;   //!< estimated number of transactions per second after that timestamp
 };
 
 /**