Merge #6669: feat: define BIP 9 fork DEPLOYMENT_V23 for new version featureset

98749a7 feat: define BIP 9 fork `DEPLOYMENT_V23` for new version featureset (Kittywhiskers Van Gogh)

Pull request description:

  ## Motivation

  Should handle the deployment needs for [dash#6662](#6662) and [dash#6665](#6665) as they're expected to be shipped in the same major version.

  ## Breaking Changes

  None expected.

  ## Checklist

  - [x] I have performed a self-review of my own code
  - [x] I have commented my code, particularly in hard-to-understand areas **(note: N/A)**
  - [x] I have added or updated relevant unit/integration/functional/e2e tests
  - [x] I have made corresponding changes to the documentation **(note: N/A)**
  - [x] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_

ACKs for top commit:
  UdjinM6:
    utACK 98749a7
  PastaPastaPasta:
    utACK 98749a7

Tree-SHA512: b61302a0bcf236f06661a4a53f1d7b3ab0f65659c1c9ab2fcb782457a25eb1e6bdc942647dca6a4e22686e0c7cc83405e099e1fa790cf007d2bee3eedc456d5f

Author: PastaPastaPasta

src/chainparams.cpp

@@ -217,6 +217,15 @@ class CMainParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_WITHDRAWALS].nFalloffCoeff = 5;          // this corresponds to 10 periods
         consensus.vDeployments[Consensus::DEPLOYMENT_WITHDRAWALS].useEHF = true;
 
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].bit = 12;
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nStartTime = 1751328000;    // July 1, 2025
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nTimeout = 1782864000;      // July 1, 2026
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nWindowSize = 4032;
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nThresholdStart = 3226;     // 80% of 4032
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nThresholdMin = 2420;       // 60% of 4032
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nFalloffCoeff = 5;          // this corresponds to 10 periods
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].useEHF = true;
+
         // The best chain should have at least this much work.
         consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000a39050764808db046f5c"); // 2216986
 
@@ -414,6 +423,15 @@ class CTestNetParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_WITHDRAWALS].nFalloffCoeff = 5;          // this corresponds to 10 periods
         consensus.vDeployments[Consensus::DEPLOYMENT_WITHDRAWALS].useEHF = true;
 
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].bit = 12;
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nStartTime = 1751328000;    // July 1, 2025
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nWindowSize = 100;
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nThresholdStart = 80;       // 80% of 100
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nThresholdMin = 60;         // 60% of 100
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nFalloffCoeff = 5;          // this corresponds to 10 periods
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].useEHF = true;
+
         // The best chain should have at least this much work.
         consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000000000000031f769ba78b4bee"); // 1189000
 
@@ -586,6 +604,15 @@ class CDevNetParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_WITHDRAWALS].nFalloffCoeff = 5;          // this corresponds to 10 periods
         consensus.vDeployments[Consensus::DEPLOYMENT_WITHDRAWALS].useEHF = true;
 
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].bit = 12;
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nStartTime = 1751328000;    // July 1, 2025
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nWindowSize = 120;
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nThresholdStart = 96;       // 80% of 120
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nThresholdMin = 72;         // 60% of 120
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nFalloffCoeff = 5;          // this corresponds to 10 periods
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].useEHF = true;
+
         // The best chain should have at least this much work.
         consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000000000000000000000000000");
 
@@ -822,6 +849,15 @@ class CRegTestParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_WITHDRAWALS].nFalloffCoeff = 5;          // this corresponds to 10 periods
         consensus.vDeployments[Consensus::DEPLOYMENT_WITHDRAWALS].useEHF = true;
 
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].bit = 12;
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nStartTime = 0;
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nWindowSize = 350;
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nThresholdStart = 350 / 5 * 4;     // 80% of window size
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nThresholdMin = 350 / 5 * 3;       // 60% of window size
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].nFalloffCoeff = 5;                 // this corresponds to 10 periods
+        consensus.vDeployments[Consensus::DEPLOYMENT_V23].useEHF = true;
+
         // The best chain should have at least this much work.
         consensus.nMinimumChainWork = uint256S("0x00");
 

src/consensus/params.h

@@ -40,6 +40,7 @@ constexpr bool ValidDeployment(BuriedDeployment dep) { return dep <= DEPLOYMENT_
 enum DeploymentPos : uint16_t {
     DEPLOYMENT_TESTDUMMY,
     DEPLOYMENT_WITHDRAWALS, // Deployment of Fix for quorum selection for withdrawals
+    DEPLOYMENT_V23,         // Deployment of doubling withdrawal limit, extended addresses
     // NOTE: Also add new deployments to VersionBitsDeploymentInfo in deploymentinfo.cpp
     MAX_VERSION_BITS_DEPLOYMENTS
 };

src/deploymentinfo.cpp

@@ -15,6 +15,10 @@ const struct VBDeploymentInfo VersionBitsDeploymentInfo[Consensus::MAX_VERSION_B
         /*.name =*/"withdrawals",
         /*.gbt_force =*/true,
     },
+    {
+        /*.name =*/"v23",
+        /*.gbt_force =*/true,
+    },
 };
 
 std::string DeploymentName(Consensus::BuriedDeployment dep)

src/rpc/blockchain.cpp

@@ -1543,6 +1543,7 @@ RPCHelpMan getblockchaininfo()
     }
     for (auto ehf_deploy : { /* sorted by activation block */
                              Consensus::DEPLOYMENT_WITHDRAWALS,
+                             Consensus::DEPLOYMENT_V23,
                              Consensus::DEPLOYMENT_TESTDUMMY }) {
         SoftForkDescPushBack(&tip, ehfSignals, softforks, consensusParams, ehf_deploy);
     }

test/functional/rpc_blockchain.py

@@ -225,6 +225,17 @@ def _test_getblockchaininfo(self):
                     'ehf': True
                 },
                 'active': False},
+            'v23': {
+                'type': 'bip9',
+                'bip9': {
+                    'status': 'defined',
+                    'start_time': 0,
+                    'timeout': 9223372036854775807,  # "v23" does not have a timeout so is set to the max int64 value
+                    'since': 0,
+                    'min_activation_height': 0,
+                    'ehf': True
+                },
+                'active': False},
             'testdummy': {
                 'type': 'bip9',
                 'bip9': {