Merge bitcoin/bitcoin#33274: kernel: chainparams & headersync updates for 30.0

755152a kernel: add testnet4 assumeutxo param at height 90'000 (fanquake)
a651268 kernel: add mainnet assumeutxo param at height 910'000 (fanquake)
943de66 kernel: update headersync params (fanquake)
66fb962 kernel: update chainTxData (fanquake)
c3cb26e kernel: update assumevalid and minimumChainWork (fanquake)
b4adae7 kernel: update assumed blockchain & chainstate sizes (fanquake)

Pull request description:

  Also adds assumeutxo params for mainnet at `910'000` & testnet4 & `90'000`.

ACKs for top commit:
  Sjors:
    re-ACK 755152a
  achow101:
    ACK 755152a
  w0xlt:
    ACK bitcoin/bitcoin@755152a
  hodlinator:
    ACK 755152a

Tree-SHA512: d26b023b1fdbb72e81c3879aa274e3900742f015d77c1bb3cde00b3b882642c6b35a6268c6ccf35fa9243b58b5a1ebe6eba3eb7f58678eee5bd8a6d6e7518a6f

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, 10, 6)
+TIME = datetime(2028, 4, 2)
 
 # Expected block interval. [timedelta]
 BLOCK_INTERVAL = timedelta(seconds=600)
 
 # The number of headers corresponding to the minchainwork parameter. [headers]
-MINCHAINWORK_HEADERS = 886157
+MINCHAINWORK_HEADERS = 912683
 
 # 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{624};
+constexpr size_t HEADER_COMMITMENT_PERIOD{632};
 
 //! Only feed headers to validation once this many headers on top have been
 //! received and validated against commitments.
-constexpr size_t REDOWNLOAD_BUFFER_SIZE{14827}; // 14827/624 = ~23.8 commitments
+constexpr size_t REDOWNLOAD_BUFFER_SIZE{15009}; // 15009/632 = ~23.7 commitments
 
 // Our memory analysis assumes 48 bytes for a CompressedHeader (so we should
 // re-calculate parameters if we compress further)

src/kernel/chainparams.cpp

@@ -118,8 +118,8 @@ class CMainParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].threshold = 1815; // 90%
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].period = 2016;
 
-        consensus.nMinimumChainWork = uint256{"0000000000000000000000000000000000000000b1f3b93b65b16d035a82be84"};
-        consensus.defaultAssumeValid = uint256{"00000000000000000001b658dd1120e82e66d2790811f89ede9742ada3ed6d77"}; // 886157
+        consensus.nMinimumChainWork = uint256{"0000000000000000000000000000000000000000dee8e2a309ad8a9820433c68"};
+        consensus.defaultAssumeValid = uint256{"00000000000000000000611fd22f2df7c8fbd0688745c3a6c3bb5109cc2a12cb"}; // 912683
 
         /**
          * The message start string is designed to be unlikely to occur in normal data.
@@ -132,7 +132,7 @@ class CMainParams : public CChainParams {
         pchMessageStart[3] = 0xd9;
         nDefaultPort = 8333;
         nPruneAfterHeight = 100000;
-        m_assumed_blockchain_size = 720;
+        m_assumed_blockchain_size = 810;
         m_assumed_chain_state_size = 14;
 
         genesis = CreateGenesisBlock(1231006505, 2083236893, 0x1d00ffff, 1, 50 * COIN);
@@ -180,14 +180,20 @@ class CMainParams : public CChainParams {
                 .hash_serialized = AssumeutxoHash{uint256{"dbd190983eaf433ef7c15f78a278ae42c00ef52e0fd2a54953782175fbadcea9"}},
                 .m_chain_tx_count = 1145604538,
                 .blockhash = consteval_ctor(uint256{"000000000000000000010b17283c3c400507969a9c2afd1dcf2082ec5cca2880"}),
+            },
+            {
+                .height = 910'000,
+                .hash_serialized = AssumeutxoHash{uint256{"4daf8a17b4902498c5787966a2b51c613acdab5df5db73f196fa59a4da2f1568"}},
+                .m_chain_tx_count = 1226586151,
+                .blockhash = consteval_ctor(uint256{"0000000000000000000108970acb9522ffd516eae17acddcb1bd16469194a821"}),
             }
         };
 
         chainTxData = ChainTxData{
-            // Data from RPC: getchaintxstats 4096 00000000000000000001b658dd1120e82e66d2790811f89ede9742ada3ed6d77
-            .nTime    = 1741017141,
-            .tx_count = 1161875261,
-            .dTxRate  = 4.620728156243148,
+            // Data from RPC: getchaintxstats 4096 00000000000000000000611fd22f2df7c8fbd0688745c3a6c3bb5109cc2a12cb
+            .nTime    = 1756722903,
+            .tx_count = 1235299397,
+            .dTxRate  = 5.456290459519495,
         };
     }
 };
@@ -232,16 +238,16 @@ class CTestNetParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].threshold = 1512; // 75%
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].period = 2016;
 
-        consensus.nMinimumChainWork = uint256{"0000000000000000000000000000000000000000000015f5e0c9f13455b0eb17"};
-        consensus.defaultAssumeValid = uint256{"00000000000003fc7967410ba2d0a8a8d50daedc318d43e8baf1a9782c236a57"}; // 3974606
+        consensus.nMinimumChainWork = uint256{"0000000000000000000000000000000000000000000016dd270dd94fac1d7632"};
+        consensus.defaultAssumeValid = uint256{"0000000000000065c6c38258e201971a3fdfcc2ceee0dd6e85a6c022d45dee34"}; // 4550000
 
         pchMessageStart[0] = 0x0b;
         pchMessageStart[1] = 0x11;
         pchMessageStart[2] = 0x09;
         pchMessageStart[3] = 0x07;
         nDefaultPort = 18333;
         nPruneAfterHeight = 1000;
-        m_assumed_blockchain_size = 200;
+        m_assumed_blockchain_size = 240;
         m_assumed_chain_state_size = 19;
 
         genesis = CreateGenesisBlock(1296688602, 414098458, 0x1d00ffff, 1, 50 * COIN);
@@ -281,10 +287,10 @@ class CTestNetParams : public CChainParams {
         };
 
         chainTxData = ChainTxData{
-            // Data from RPC: getchaintxstats 4096 00000000000003fc7967410ba2d0a8a8d50daedc318d43e8baf1a9782c236a57
-            .nTime    = 1741042082,
-            .tx_count = 475477615,
-            .dTxRate  = 17.15933950357594,
+            // Data from RPC: getchaintxstats 4096 0000000000000065c6c38258e201971a3fdfcc2ceee0dd6e85a6c022d45dee34
+            .nTime    = 1751816758,
+            .tx_count = 508468699,
+            .dTxRate  = 7.172978845985714,
         };
     }
 };
@@ -328,17 +334,17 @@ class CTestNet4Params : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].threshold = 1512; // 75%
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].period = 2016;
 
-        consensus.nMinimumChainWork = uint256{"0000000000000000000000000000000000000000000001d6dce8651b6094e4c1"};
-        consensus.defaultAssumeValid = uint256{"0000000000003ed4f08dbdf6f7d6b271a6bcffce25675cb40aa9fa43179a89f3"}; // 72600
+        consensus.nMinimumChainWork = uint256{"00000000000000000000000000000000000000000000034a4690fe592dc49c7c"};
+        consensus.defaultAssumeValid = uint256{"000000000000000180a58e7fa3b0db84b5ea76377524894f53660d93ac839d9b"}; // 91000
 
         pchMessageStart[0] = 0x1c;
         pchMessageStart[1] = 0x16;
         pchMessageStart[2] = 0x3f;
         pchMessageStart[3] = 0x28;
         nDefaultPort = 48333;
         nPruneAfterHeight = 1000;
-        m_assumed_blockchain_size = 11;
-        m_assumed_chain_state_size = 1;
+        m_assumed_blockchain_size = 22;
+        m_assumed_chain_state_size = 2;
 
         const char* testnet4_genesis_msg = "03/May/2024 000000000000000000001ebd58c244970b3aa9d783bb001011fbe8ea8e98e00e";
         const CScript testnet4_genesis_script = CScript() << "000000000000000000000000000000000000000000000000000000000000000000"_hex << OP_CHECKSIG;
@@ -373,14 +379,19 @@ class CTestNet4Params : public CChainParams {
         m_is_mockable_chain = false;
 
         m_assumeutxo_data = {
-            {}
+            {
+                .height = 90'000,
+                .hash_serialized = AssumeutxoHash{uint256{"784fb5e98241de66fdd429f4392155c9e7db5c017148e66e8fdbc95746f8b9b5"}},
+                .m_chain_tx_count = 11347043,
+                .blockhash = consteval_ctor(uint256{"0000000002ebe8bcda020e0dd6ccfbdfac531d2f6a81457191b99fc2df2dbe3b"}),
+            }
         };
 
         chainTxData = ChainTxData{
-            // Data from RPC: getchaintxstats 4096 0000000000003ed4f08dbdf6f7d6b271a6bcffce25675cb40aa9fa43179a89f3
-            .nTime    = 1741070246,
-            .tx_count = 7653966,
-            .dTxRate  = 1.239174414591965,
+            // Data from RPC: getchaintxstats 4096 000000000000000180a58e7fa3b0db84b5ea76377524894f53660d93ac839d9b
+            .nTime    = 1752470331,
+            .tx_count = 11414302,
+            .dTxRate  = 0.2842619757327476,
         };
     }
 };
@@ -402,15 +413,15 @@ class SigNetParams : public CChainParams {
             vSeeds.emplace_back("seed.signet.bitcoin.sprovoost.nl.");
             vSeeds.emplace_back("seed.signet.achownodes.xyz."); // Ava Chow, only supports x1, x5, x9, x49, x809, x849, xd, x400, x404, x408, x448, xc08, xc48, x40c
 
-            consensus.nMinimumChainWork = uint256{"000000000000000000000000000000000000000000000000000002b517f3d1a1"};
-            consensus.defaultAssumeValid = uint256{"000000895a110f46e59eb82bbc5bfb67fa314656009c295509c21b4999f5180a"}; // 237722
-            m_assumed_blockchain_size = 9;
-            m_assumed_chain_state_size = 1;
+            consensus.nMinimumChainWork = uint256{"0000000000000000000000000000000000000000000000000000067d328e681a"};
+            consensus.defaultAssumeValid = uint256{"000000128586e26813922680309f04e1de713c7542fee86ed908f56368aefe2e"}; // 267665
+            m_assumed_blockchain_size = 20;
+            m_assumed_chain_state_size = 4;
             chainTxData = ChainTxData{
-                // Data from RPC: getchaintxstats 4096 000000895a110f46e59eb82bbc5bfb67fa314656009c295509c21b4999f5180a
-                .nTime    = 1741019645,
-                .tx_count = 16540736,
-                .dTxRate  = 1.064918879911595,
+                // Data from RPC: getchaintxstats 4096 000000128586e26813922680309f04e1de713c7542fee86ed908f56368aefe2e
+                .nTime    = 1756723017,
+                .tx_count = 26185472,
+                .dTxRate  = 0.7452721495389969,
             };
         } else {
             bin = *options.challenge;