Merge bitcoin/bitcoin#28591: kernel: chainparams updates for 26.x

bd71f03df75d2c17926b6d575ffa886daa334e3a doc: update example pulls in release-process.md (fanquake)
b2ede22395ae8ce371433c9611929374dd98908a headerssync: update params for 26.x (fanquake)
f12f92b813cd8c29904f36f8ed7ed74649886897 kernel: update m_assumed_* chain params for 26.x (fanquake)
a8c2e5e556daf2a8c6b013110c802768b3f4b30e kernel: update chainTxData for 26.x (fanquake)
a9d070a6f89d855aec5fbe6efe679feef86a21f3 kernel: update nMinimumChainWork & defaultAssumeValid for 26.x (fanquake)

Pull request description:

  Update chainparams pre `26.x` branch off.

  Note: Remember that some variance is expected in the m_assumed_* sizes.

  Closes #28572.

ACKs for top commit:
  Sjors:
    re-ACK bd71f03df75d2c17926b6d575ffa886daa334e3a
  ajtowns:
    reACK bd71f03df75d2c17926b6d575ffa886daa334e3a
  darosior:
    re-ACK bd71f03df75d2c17926b6d575ffa886daa334e3a for assumevalid and minchainwork params.

Tree-SHA512: c586b82711477bfc1fd9ac4c9c1130ccde29f75d652492c66ef5730f4a49b7da822a3ad2d9090468ea0c9f0e77d00c25f6a800600c81878d8141ce2ffb3724af

2 files changed, 22 insertions, 22 deletions

diff --git a/src/headerssync.cpp b/src/headerssync.cpp
index 1b5d7305e8..b885590c56 100644
--- a/src/headerssync.cpp
+++ b/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{600};
+constexpr size_t HEADER_COMMITMENT_PERIOD{606};
 
 //! Only feed headers to validation once this many headers on top have been
 //! received and validated against commitments.
-constexpr size_t REDOWNLOAD_BUFFER_SIZE{14308}; // 14308/600 = ~23.8 commitments
+constexpr size_t REDOWNLOAD_BUFFER_SIZE{14441}; // 14441/606 = ~23.8 commitments
 
 // Our memory analysis assumes 48 bytes for a CompressedHeader (so we should
 // re-calculate parameters if we compress further)
diff --git a/src/kernel/chainparams.cpp b/src/kernel/chainparams.cpp
index 644e2a2c67..3ac8756e41 100644
--- a/src/kernel/chainparams.cpp
+++ b/src/kernel/chainparams.cpp
@@ -104,8 +104,8 @@ public:
         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 = uint256S("0x000000000000000000000000000000000000000044a50fe819c39ad624021859");
-        consensus.defaultAssumeValid = uint256S("0x000000000000000000035c3f0d31e71a5ee24c5aaf3354689f65bd7b07dee632"); // 784000
+        consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000052b2559353df4117b7348b64");
+        consensus.defaultAssumeValid = uint256S("0x00000000000000000001a0a448d6cf2546b06801389cc030b2b18c6491266815"); // 804000
 
         /**
          * The message start string is designed to be unlikely to occur in normal data.
@@ -118,8 +118,8 @@ public:
         pchMessageStart[3] = 0xd9;
         nDefaultPort = 8333;
         nPruneAfterHeight = 100000;
-        m_assumed_blockchain_size = 540;
-        m_assumed_chain_state_size = 7;
+        m_assumed_blockchain_size = 590;
+        m_assumed_chain_state_size = 9;
 
         genesis = CreateGenesisBlock(1231006505, 2083236893, 0x1d00ffff, 1, 50 * COIN);
         consensus.hashGenesisBlock = genesis.GetHash();
@@ -177,10 +177,10 @@ public:
         };
 
         chainTxData = ChainTxData{
-            // Data from RPC: getchaintxstats 4096 000000000000000000035c3f0d31e71a5ee24c5aaf3354689f65bd7b07dee632
-            .nTime    = 1680665245,
-            .nTxCount = 820876044,
-            .dTxRate  = 3.672283614033389,
+            // Data from RPC: getchaintxstats 4096 00000000000000000001a0a448d6cf2546b06801389cc030b2b18c6491266815
+            .nTime    = 1692502494,
+            .nTxCount = 881818374,
+            .dTxRate  = 5.521964628130412,
         };
     }
 };
@@ -222,8 +222,8 @@ public:
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = 1628640000; // August 11th, 2021
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].min_activation_height = 0; // No activation delay
 
-        consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000000000977edb0244170858d07");
-        consensus.defaultAssumeValid = uint256S("0x0000000000000021bc50a89cde4870d4a81ffe0153b3c8de77b435a2fd3f6761"); // 2429000
+        consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000000000b6a51f415a67c0da307");
+        consensus.defaultAssumeValid = uint256S("0x0000000000000093bcb68c03a9a168ae252572d348a2eaeba2cdf9231d73206f"); // 2500000
 
         pchMessageStart[0] = 0x0b;
         pchMessageStart[1] = 0x11;
@@ -276,10 +276,10 @@ public:
         };
 
         chainTxData = ChainTxData{
-            // Data from RPC: getchaintxstats 4096 0000000000000021bc50a89cde4870d4a81ffe0153b3c8de77b435a2fd3f6761
-            .nTime    = 1681542696,
-            .nTxCount = 65345929,
-            .dTxRate  = 0.09855282814711661,
+            // Data from RPC: getchaintxstats 4096 0000000000000093bcb68c03a9a168ae252572d348a2eaeba2cdf9231d73206f
+            .nTime    = 1694733634,
+            .nTxCount = 66484552,
+            .dTxRate  = 0.1804908356632494,
         };
     }
 };
@@ -302,15 +302,15 @@ public:
             vSeeds.emplace_back("178.128.221.177");
             vSeeds.emplace_back("v7ajjeirttkbnt32wpy3c6w3emwnfr3fkla7hpxcfokr3ysd3kqtzmqd.onion:38333");
 
-            consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000000000000000001899d8142b0");
-            consensus.defaultAssumeValid = uint256S("0x0000004429ef154f7e00b4f6b46bfbe2d2678ecd351d95bbfca437ab9a5b84ec"); // 138000
+            consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000000000000000001ad46be4862");
+            consensus.defaultAssumeValid = uint256S("0x0000013d778ba3f914530f11f6b69869c9fab54acff85acd7b8201d111f19b7f"); // 150000
             m_assumed_blockchain_size = 1;
             m_assumed_chain_state_size = 0;
             chainTxData = ChainTxData{
-                // Data from RPC: getchaintxstats 4096 0000004429ef154f7e00b4f6b46bfbe2d2678ecd351d95bbfca437ab9a5b84ec
-                .nTime    = 1681127428,
-                .nTxCount = 2226359,
-                .dTxRate  = 0.006424463050600656,
+                // Data from RPC: getchaintxstats 4096 0000013d778ba3f914530f11f6b69869c9fab54acff85acd7b8201d111f19b7f
+                .nTime    = 1688366339,
+                .nTxCount = 2262750,
+                .dTxRate  = 0.003414084572046456,
             };
         } else {
             bin = *options.challenge;