Subsidy hardfork

configure.ac

@@ -1,6 +1,6 @@
 AC_PREREQ([2.69])
 define(_CLIENT_VERSION_MAJOR, 3)
-define(_CLIENT_VERSION_MINOR, 1)
+define(_CLIENT_VERSION_MINOR, 2)
 define(_CLIENT_VERSION_BUILD, 0)
 define(_CLIENT_VERSION_RC, 0)
 define(_CLIENT_VERSION_IS_RELEASE, true)

src/chainparams.cpp

@@ -120,8 +120,13 @@ class CMainParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].min_activation_height = 1056905;
 
+        // Supply hardfork
+        consensus.nSubsidyAddress = "mbc1qsr02lgky5tghhxupl4u48l96h7fdk07muekwru";
+        consensus.nSubsidyHeight = 2650000;
+        consensus.nSubsidyAmount = 11000000000 * COIN;
+
         consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000000000000000054d62a0d6408");
-        consensus.defaultAssumeValid = uint256S("0xd7b08ed3874a97dbf7bc8ba3b7b55e75704c57e3a2c52737232fbcdc93bed040"); // 1056000
+        consensus.defaultAssumeValid = uint256S("0x23eef88fbc540be75a7b61188bcf118c29db9d4f5fa663863d0458f74ba675b2"); // 1056000
 
         /**
          * The message start string is designed to be unlikely to occur in normal data.
@@ -143,12 +148,12 @@ class CMainParams : public CChainParams {
         // Decrease reward by 30% each 2 years
         consensus.rewardEpoch = 525960 * 2; 
         consensus.rewardEpochRate = 0.3;
+        consensus.rewardEpochRate_v2 = 0.18;
 
         const char* pszTimestamp = "The WSJ 09/Oct/2019 Nobel Prize in Chemistry Awarded to Developers of Lithium-Ion Batteries";
         std::vector<SnapshotProvider> providers = {
             {"http://snapshot.microbitcoin.org", "/mainnet.csv"},
             {"http://micro.codepillow.io", "/mainnet.csv"},
-            {"http://sman.pw", "/snapshot/mainnet.csv"}
         };
 
         vSnapshot = InitSnapshot("mainnet.csv", providers);
@@ -190,6 +195,8 @@ class CMainParams : public CChainParams {
                 { 800000, uint256S("0x038389a836e6f90e0f379bdc6a0c74d841eb6dbec8b23e2b335a981be3d0a56f")},
                 { 900000, uint256S("0xb7381d1d7c281eec55fa985fd28bdb0c3bf5373a936ea37b3d861a7520d128f4")},
                 { 1000000, uint256S("0x849d3a7f266d3ba3ebce81c20f467f532832652a86e6495b03ec77985535efc9")},
+                { 2000000, uint256S("0xa4ecd2833734ce7bb8fb1af7ae53bc33c4bf986dbc7eb87d8d01d6873fdb7ded")},
+                { 2600000, uint256S("0x23eef88fbc540be75a7b61188bcf118c29db9d4f5fa663863d0458f74ba675b2")},
             }
         };
 
@@ -198,10 +205,10 @@ class CMainParams : public CChainParams {
         };
 
         chainTxData = ChainTxData{
-            // Data from rpc: getchaintxstats 4096 d7b08ed3874a97dbf7bc8ba3b7b55e75704c57e3a2c52737232fbcdc93bed040
-            /* nTime    */ 1634486414,
-            /* nTxCount */ 1381700,
-            /* dTxRate  */ 0.02002703629723786
+            // Data from rpc: getchaintxstats 4096 23eef88fbc540be75a7b61188bcf118c29db9d4f5fa663863d0458f74ba675b2
+            /* nTime    */ 1727905204,
+            /* nTxCount */ 3043896,
+            /* dTxRate  */ 0.01708408484745776
         };
     }
 };
@@ -239,15 +246,21 @@ class CTestNetParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = 1628640000; // August 11th, 2021
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].min_activation_height = 0; // No activation delay
 
+        // Supply hardfork
+        consensus.nSubsidyAddress = "";
+        consensus.nSubsidyHeight = 99999999999;
+        consensus.nSubsidyAmount = 1000 * COIN;
+
         consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000005180c3bd8290da33a1a");
         consensus.defaultAssumeValid = uint256S("0x0000000000004ae2f3896ca8ecd41c460a35bf6184e145d91558cece1c688a76"); // 2010000
 
         consensus.lwmaAveragingWindow = 90;
         consensus.baseReward = 5500 * COIN;
 
         // Decrease reward by 30% each 2 years
-        consensus.rewardEpoch = 525960 * 2; 
+        consensus.rewardEpoch = 525960 * 2;
         consensus.rewardEpochRate = 0.3;
+        consensus.rewardEpochRate_v2 = 0.18;
 
         pchMessageStart[0] = 0x74;
         pchMessageStart[1] = 0x6d;
@@ -395,8 +408,9 @@ class SigNetParams : public CChainParams {
         consensus.baseReward = 5500 * COIN;
 
         // Decrease reward by 30% each 2 years
-        consensus.rewardEpoch = 525960 * 2; 
+        consensus.rewardEpoch = 525960 * 2;
         consensus.rewardEpochRate = 0.3;
+        consensus.rewardEpochRate_v2 = 0.18;
 
         const char* pszTimestamp = "The WSJ 09/Oct/2019 Nobel Prize in Chemistry Awarded to Developers of Lithium-Ion Batteries";
         vSnapshot = EmptySnapshot();
@@ -458,6 +472,11 @@ class CRegTestParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].min_activation_height = 0; // No activation delay
 
+        // Supply hardfork
+        consensus.nSubsidyAddress = "rmbc1q0xey88kv87e7c82dj8kuje4tesvster8a562ux";
+        consensus.nSubsidyHeight = 200;
+        consensus.nSubsidyAmount = 11000000000 * COIN;
+
         consensus.nMinimumChainWork = uint256{};
         consensus.defaultAssumeValid = uint256{};
 
@@ -476,8 +495,9 @@ class CRegTestParams : public CChainParams {
         consensus.baseReward = 5500 * COIN;
 
         // Decrease reward by 30% each 2 years
-        consensus.rewardEpoch = 525960 * 2; 
+        consensus.rewardEpoch = 525960 * 2;
         consensus.rewardEpochRate = 0.3;
+        consensus.rewardEpochRate_v2 = 0.18;
 
         const char* pszTimestamp = "Cretaceous Bird-Like Dinosaur Had Adaptations for Swimming and Diving | Sci-News Dec 2, 2022";
 

src/consensus/params.h

@@ -86,9 +86,15 @@ struct Params {
     uint256 defaultAssumeValid;
     int lwmaAveragingWindow;
     double rewardEpochRate;
+    double rewardEpochRate_v2;
     CAmount baseReward;
     int rewardEpoch;
 
+    // Subsidy hardfork
+    std::string nSubsidyAddress;
+    int nSubsidyHeight;
+    CAmount nSubsidyAmount;
+
     /**
      * If true, witness commitments contain a payload equal to a MicroBitcoin Script solution
      * to the signet challenge. See BIP325.

src/pow.cpp

@@ -22,6 +22,11 @@ unsigned int Lwma3CalculateNextWorkRequired(const CBlockIndex* pindexLast, const
     const arith_uint256 powLimit = UintToArith256(params.powLimit);
     if (height < N) { return powLimit.GetCompact(); }
 
+    // Subsidy hardfork
+    // Here we reset the diff in order to guarantee smooth experience
+    if (height >= params.nSubsidyHeight && height < params.nSubsidyHeight + N)
+        return powLimit.GetCompact();
+
     arith_uint256 sumTarget, previousDiff, nextTarget;
     int64_t thisTimestamp, previousTimestamp;
     int64_t t = 0, j = 0, solvetimeSum = 0;

src/validation.cpp

@@ -52,6 +52,9 @@
 #include <validationinterface.h>
 #include <warnings.h>
 
+#include <key_io.h>
+#include <script/standard.h>
+
 #include <numeric>
 #include <optional>
 #include <string>
@@ -1193,7 +1196,17 @@ CTransactionRef GetTransaction(const CBlockIndex* const block_index, const CTxMe
 
 CAmount GetBlockSubsidy(int nHeight, const Consensus::Params& consensusParams)
 {
-    const long double r = 1 + (std::log(1 - consensusParams.rewardEpochRate) / consensusParams.rewardEpoch);
+    double rewardEpochRate = consensusParams.rewardEpochRate;
+
+    // Subsidy hardfork
+    if (nHeight == ::Params().GetConsensus().nSubsidyHeight)
+        return ::Params().GetConsensus().nSubsidyAmount;
+
+    // Updated epoch reduction rate post hardfork
+    if (nHeight > ::Params().GetConsensus().nSubsidyHeight)
+        rewardEpochRate = consensusParams.rewardEpochRate_v2;
+
+    const long double r = 1 + (std::log(1 - rewardEpochRate) / consensusParams.rewardEpoch);
     return consensusParams.baseReward * std::pow(r, nHeight);
 }
 
@@ -3263,6 +3276,27 @@ static bool ContextualCheckBlock(const CBlock& block, BlockValidationState& stat
         }
     }
 
+    // Subsidy hardfork
+    if (nHeight == ::Params().GetConsensus().nSubsidyHeight) {
+        // Just in case
+        if (block.vtx[0]->vout.size() < 1) {
+            return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS, "bad-subsidy-hardfork-output", "invalid subsidy outoutput");
+        }
+
+        const CTxOut& output = block.vtx[0]->vout[0];
+
+        CTxDestination destination = DecodeDestination(::Params().GetConsensus().nSubsidyAddress);
+        CScript subsidyScript = GetScriptForDestination(destination);
+
+        if (output.scriptPubKey != subsidyScript) {
+            return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS, "bad-subsidy-hardfork-scriptpubkey", "invalid subsidy address");
+        }
+
+        if (output.nValue != ::Params().GetConsensus().nSubsidyAmount) {
+            return state.Invalid(BlockValidationResult::BLOCK_CONSENSUS, "bad-subsidy-hardfork-amount", "invalid subsidy amount");
+        }
+    }
+
     // Validation for witness commitments.
     // * We compute the witness hash (which is the hash including witnesses) of all the block's transactions, except the
     //   coinbase (where 0x0000....0000 is used instead).