Merge pull request dashpay#3337 from codablock/pr_v15_assumevalid

[v0.15.x] Backport dashpay#3336 and update release notes

Author: UdjinM6

doc/release-notes.md

@@ -233,6 +233,8 @@ modules were reorganized in separate folders to make navigation through code a b
 
 See detailed [set of changes](https://github.com/dashpay/dash/compare/v0.14.0.5...dashpay:v0.15.0.0).
 
+- [`3c055bf79`](https://github.com/dashpay/dash/commit/3c055bf79) Bump nMinimumChainWork and defaultAssumeValid (#3336)
+- [`818e7a6f7`](https://github.com/dashpay/dash/commit/818e7a6f7) Update release notes
 - [`9d5c3d12e`](https://github.com/dashpay/dash/commit/9d5c3d12e) Try to actually accept newly created dstx-es into masternode's mempool (#3332)
 - [`f23e722da`](https://github.com/dashpay/dash/commit/f23e722da) Switch CLIENT_VERSION_IS_RELEASE to `true` for v0.15 (#3306)
 - [`b57f1dac8`](https://github.com/dashpay/dash/commit/b57f1dac8) Update release notes

src/chainparams.cpp

@@ -302,10 +302,10 @@ class CMainParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_DIP0008].nThreshold = 3226; // 80% of 4032
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000020a5cd0e7d1481a5f8d5"); // 1167570
+        consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000027b81f49774e9f7fc93f"); // 1215000
 
         // By default assume that the signatures in ancestors of this block are valid.
-        consensus.defaultAssumeValid = uint256S("0x000000000000000fb7b1e9b81700283dff0f7d87cf458e5edfdae00c669de661"); // 1167570
+        consensus.defaultAssumeValid = uint256S("0x0000000000000009a563e41afbafa4044861f32feb871de41f4c6e401dac1dac"); // 1215000
 
         /**
          * The message start string is designed to be unlikely to occur in normal data.
@@ -481,10 +481,10 @@ class CTestNetParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_DIP0008].nThreshold = 50; // 50% of 100
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000000000098ebee572c3cd1"); // 200000
+        consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000000000ac720e0b2ed13d"); // 260000
 
         // By default assume that the signatures in ancestors of this block are valid.
-        consensus.defaultAssumeValid = uint256S("0x000000001015eb5ef86a8fe2b3074d947bc972c5befe32b28dd5ce915dc0d029"); // 200000
+        consensus.defaultAssumeValid = uint256S("0x000002bbe0f404f22f0aff8032e2a87cef6a32f0840e9199aa0b79ba3870b33c"); // 260000
 
         pchMessageStart[0] = 0xce;
         pchMessageStart[1] = 0xe2;