Merge bitcoin/bitcoin#31978: kernel: pre-29.x chainparams and headerssync update

11a2d3a [headerssync] update headerssync config for v29 (glozow)
dd23c53 [kernel] update chainTxData for v29 (glozow)
80926af [kernel] update assumevalid and minimumChainWork for v29 (glozow)
0683b8e [kernel] update assumed blockchain and chainstate sizes for v29 (glozow)

Pull request description:

  Update chainparams and headerssync config for v29.0 (see [release process](https://github.com/bitcoin/bitcoin/blob/master/doc/release-process.md#before-branch-off)).

ACKs for top commit:
  achow101:
    ACK 11a2d3a
  Sjors:
    ACK 11a2d3a

Tree-SHA512: 726cbb16a3bc8b11419c2888b17552d70217f616f17a715ba4983fdfccb0cfd9705c528601a6bb3e62563a6f43d41543181e13cdbad89d75abba3b7899328031

Author: fanquake

contrib/devtools/headerssync-params.py

@@ -12,13 +12,13 @@
 # Parameters:
 
 # Aim for still working fine at some point in the future. [datetime]
-TIME = datetime(2027, 4, 1)
+TIME = datetime(2027, 10, 6)
 
 # Expected block interval. [timedelta]
 BLOCK_INTERVAL = timedelta(seconds=600)
 
 # The number of headers corresponding to the minchainwork parameter. [headers]
-MINCHAINWORK_HEADERS = 856760
+MINCHAINWORK_HEADERS = 886157
 
 # Combined processing bandwidth from all attackers to one victim. [bit/s]
 # 6 Gbit/s is approximately the speed at which a single thread of a Ryzen 5950X CPU thread can hash

src/headerssync.cpp

@@ -13,11 +13,11 @@
 // contrib/devtools/headerssync-params.py.
 
 //! Store one header commitment per HEADER_COMMITMENT_PERIOD blocks.
-constexpr size_t HEADER_COMMITMENT_PERIOD{615};
+constexpr size_t HEADER_COMMITMENT_PERIOD{624};
 
 //! Only feed headers to validation once this many headers on top have been
 //! received and validated against commitments.
-constexpr size_t REDOWNLOAD_BUFFER_SIZE{14621}; // 14621/615 = ~23.8 commitments
+constexpr size_t REDOWNLOAD_BUFFER_SIZE{14827}; // 14827/624 = ~23.8 commitments
 
 // Our memory analysis assumes 48 bytes for a CompressedHeader (so we should
 // re-calculate parameters if we compress further)

src/kernel/chainparams.cpp

@@ -117,8 +117,8 @@ class CMainParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = 1628640000; // August 11th, 2021
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].min_activation_height = 709632; // Approximately November 12th, 2021
 
-        consensus.nMinimumChainWork = uint256{"000000000000000000000000000000000000000088e186b70e0862c193ec44d6"};
-        consensus.defaultAssumeValid = uint256{"000000000000000000011c5890365bdbe5d25b97ce0057589acaef4f1a57263f"}; // 856760
+        consensus.nMinimumChainWork = uint256{"0000000000000000000000000000000000000000b1f3b93b65b16d035a82be84"};
+        consensus.defaultAssumeValid = uint256{"00000000000000000001b658dd1120e82e66d2790811f89ede9742ada3ed6d77"}; // 886157
 
         /**
          * The message start string is designed to be unlikely to occur in normal data.
@@ -131,7 +131,7 @@ class CMainParams : public CChainParams {
         pchMessageStart[3] = 0xd9;
         nDefaultPort = 8333;
         nPruneAfterHeight = 100000;
-        m_assumed_blockchain_size = 620;
+        m_assumed_blockchain_size = 720;
         m_assumed_chain_state_size = 14;
 
         genesis = CreateGenesisBlock(1231006505, 2083236893, 0x1d00ffff, 1, 50 * COIN);
@@ -201,10 +201,10 @@ class CMainParams : public CChainParams {
         };
 
         chainTxData = ChainTxData{
-            // Data from RPC: getchaintxstats 4096 000000000000000000011c5890365bdbe5d25b97ce0057589acaef4f1a57263f
-            .nTime    = 1723649144,
-            .tx_count = 1059312821,
-            .dTxRate  = 6.721086701157182,
+            // Data from RPC: getchaintxstats 4096 00000000000000000001b658dd1120e82e66d2790811f89ede9742ada3ed6d77
+            .nTime    = 1741017141,
+            .tx_count = 1161875261,
+            .dTxRate  = 4.620728156243148,
         };
     }
 };
@@ -247,16 +247,16 @@ 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
 
-        consensus.nMinimumChainWork = uint256{"000000000000000000000000000000000000000000000f209695166be8b61fa9"};
-        consensus.defaultAssumeValid = uint256{"000000000000000465b1a66c9f386308e8c75acef9201f3f577811da09fc90ad"}; // 2873500
+        consensus.nMinimumChainWork = uint256{"0000000000000000000000000000000000000000000015f5e0c9f13455b0eb17"};
+        consensus.defaultAssumeValid = uint256{"00000000000003fc7967410ba2d0a8a8d50daedc318d43e8baf1a9782c236a57"}; // 3974606
 
         pchMessageStart[0] = 0x0b;
         pchMessageStart[1] = 0x11;
         pchMessageStart[2] = 0x09;
         pchMessageStart[3] = 0x07;
         nDefaultPort = 18333;
         nPruneAfterHeight = 1000;
-        m_assumed_blockchain_size = 93;
+        m_assumed_blockchain_size = 200;
         m_assumed_chain_state_size = 19;
 
         genesis = CreateGenesisBlock(1296688602, 414098458, 0x1d00ffff, 1, 50 * COIN);
@@ -302,10 +302,10 @@ class CTestNetParams : public CChainParams {
         };
 
         chainTxData = ChainTxData{
-            // Data from RPC: getchaintxstats 4096 000000000000000465b1a66c9f386308e8c75acef9201f3f577811da09fc90ad
-            .nTime    = 1723613341,
-            .tx_count = 187917082,
-            .dTxRate  = 3.265051477698455,
+            // Data from RPC: getchaintxstats 4096 00000000000003fc7967410ba2d0a8a8d50daedc318d43e8baf1a9782c236a57
+            .nTime    = 1741042082,
+            .tx_count = 475477615,
+            .dTxRate  = 17.15933950357594,
         };
     }
 };
@@ -346,17 +346,17 @@ class CTestNet4Params : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].min_activation_height = 0; // No activation delay
 
-        consensus.nMinimumChainWork = uint256{"00000000000000000000000000000000000000000000005faa15d02e6202f3ba"};
-        consensus.defaultAssumeValid = uint256{"000000005be348057db991fa5d89fe7c4695b667cfb311391a8db374b6f681fd"}; // 39550
+        consensus.nMinimumChainWork = uint256{"0000000000000000000000000000000000000000000001d6dce8651b6094e4c1"};
+        consensus.defaultAssumeValid = uint256{"0000000000003ed4f08dbdf6f7d6b271a6bcffce25675cb40aa9fa43179a89f3"}; // 72600
 
         pchMessageStart[0] = 0x1c;
         pchMessageStart[1] = 0x16;
         pchMessageStart[2] = 0x3f;
         pchMessageStart[3] = 0x28;
         nDefaultPort = 48333;
         nPruneAfterHeight = 1000;
-        m_assumed_blockchain_size = 1;
-        m_assumed_chain_state_size = 0;
+        m_assumed_blockchain_size = 11;
+        m_assumed_chain_state_size = 1;
 
         const char* testnet4_genesis_msg = "03/May/2024 000000000000000000001ebd58c244970b3aa9d783bb001011fbe8ea8e98e00e";
         const CScript testnet4_genesis_script = CScript() << "000000000000000000000000000000000000000000000000000000000000000000"_hex << OP_CHECKSIG;
@@ -401,10 +401,10 @@ class CTestNet4Params : public CChainParams {
         };
 
         chainTxData = ChainTxData{
-            // Data from RPC: getchaintxstats 4096 000000005be348057db991fa5d89fe7c4695b667cfb311391a8db374b6f681fd
-            .nTime    = 1723651702,
-            .tx_count = 757229,
-            .dTxRate  = 0.01570402633472492,
+            // Data from RPC: getchaintxstats 4096 0000000000003ed4f08dbdf6f7d6b271a6bcffce25675cb40aa9fa43179a89f3
+            .nTime    = 1741070246,
+            .tx_count = 7653966,
+            .dTxRate  = 1.239174414591965,
         };
     }
 };
@@ -428,15 +428,15 @@ class SigNetParams : public CChainParams {
             vSeeds.emplace_back("178.128.221.177");
             vSeeds.emplace_back("v7ajjeirttkbnt32wpy3c6w3emwnfr3fkla7hpxcfokr3ysd3kqtzmqd.onion:38333");
 
-            consensus.nMinimumChainWork = uint256{"0000000000000000000000000000000000000000000000000000025dbd66e58f"};
-            consensus.defaultAssumeValid = uint256{"0000014aad1d58dddcb964dd749b073374c6306e716b22f573a2efe68d414539"}; // 208800
-            m_assumed_blockchain_size = 2;
-            m_assumed_chain_state_size = 0;
+            consensus.nMinimumChainWork = uint256{"000000000000000000000000000000000000000000000000000002b517f3d1a1"};
+            consensus.defaultAssumeValid = uint256{"000000895a110f46e59eb82bbc5bfb67fa314656009c295509c21b4999f5180a"}; // 237722
+            m_assumed_blockchain_size = 9;
+            m_assumed_chain_state_size = 1;
             chainTxData = ChainTxData{
-                // Data from RPC: getchaintxstats 4096 0000014aad1d58dddcb964dd749b073374c6306e716b22f573a2efe68d414539
-                .nTime    = 1723655233,
-                .tx_count = 5507045,
-                .dTxRate  = 0.06271073277261494,
+                // Data from RPC: getchaintxstats 4096 000000895a110f46e59eb82bbc5bfb67fa314656009c295509c21b4999f5180a
+                .nTime    = 1741019645,
+                .tx_count = 16540736,
+                .dTxRate  = 1.064918879911595,
             };
         } else {
             bin = *options.challenge;