kernel: Chainparams and headerssync updates pre-31.0 #34677

pull achow101 wants to merge 5 commits into bitcoin:master from achow101:31-chainparams changing 2 files +66 −42
  1. achow101 commented at 12:33 AM on February 26, 2026: member

    Update chainparams and headerssync params per the release process.

    Also added new assumeutxo snapshots for each network. I've uploaded snapshots to https://achow101.com/files/utxo-snapshots/

  2. kernel: update assumed blockchain and chainstate sizes 5ca0c55517
  3. kernel: update defaultAssumeValid and minimumChainWork 8eaf1d26d4
  4. kernel: update chainTxData cf261b071f
  5. kernel: Update headerssync params 58c2e23fca
  6. DrahtBot added the label Validation on Feb 26, 2026
  7. achow101 renamed this:
    kernel: Chainparams and headerssync updates
    kernel: Chainparams and headerssync updates pre-31.0
    on Feb 26, 2026
  8. achow101 added this to the milestone 31.0 on Feb 26, 2026
  9. DrahtBot commented at 12:34 AM on February 26, 2026: contributor

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    The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

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    Reviews

    See the guideline for information on the review process.

    Type Reviewers
    ACK janb84, Sjors, sipa, jaonoctus, fjahr

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    Conflicts

    Reviewers, this pull request conflicts with the following ones:

    • #26201 (Remove Taproot BIP 9 deployment by Sjors)

    If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

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    LLM Linter (✨ experimental)

    Possible places where named args for integral literals may be used (e.g. func(x, /*named_arg=*/0) in C++, and func(x, named_arg=0) in Python):

    • [datetime(2028, 10, 10)] in contrib/devtools/headerssync-params.py

    <sup>2026-02-26 07:23:28</sup>

  10. kernel: Add recent assumeutxo snapshot info 44538f8ada
  11. janb84 commented at 1:21 PM on February 26, 2026: contributor

    ACK 44538f8ada868cb73ffa7a4bfb5267046d3f6b85

    Checked some hashes with block heights /chainwork / getchaintxstats, all match (for mainnet. testnets checked only public information)

    Mainnet: https://mempool.space/block/00000000000000000000ccebd6d74d9194d8dcdc1d177c478e094bfad51ba5ac => 938'343

    MinimumChainwork matches:

    <details>

    bitcoin-cli getblockheader 00000000000000000000ccebd6d74d9194d8dcdc1d177c478e094bfad51ba5ac
{
  "hash": "00000000000000000000ccebd6d74d9194d8dcdc1d177c478e094bfad51ba5ac",
  "height": 938343,
[...]
  **"chainwork": "0000000000000000000000000000000000000001128750f82f4c366153a3a030"**,
}

    </details>

    https://mempool.space/block/0000000000000000000147034958af1652b2b91bba607beacc5e72a56f0fb5ee = > 935'000

    getchaintxstats match ;

    <details>

    bitcoin-cli getchaintxstats 4096 00000000000000000000ccebd6d74d9194d8dcdc1d177c478e094bfad51ba5ac
{
  "time": 1772055173,
  "txcount": 1315805869,
  "window_final_block_hash": "00000000000000000000ccebd6d74d9194d8dcdc1d177c478e094bfad51ba5ac",
  "window_final_block_height": 938343,
  "window_block_count": 4096,
  "window_interval": 2346169,
  "window_tx_count": 12671917,
  "txrate": 5.40111006496122
}

    </details>

    Testnet 3

    https://mempool.space/testnet/block/000000007a61e4230b28ac5cb6b5e5a0130de37ac1faf2f8987d2fa6505b67f4 => 4'842'348

    https://mempool.space/testnet/block/00000000000000f4971a7fb37fbdff89315b69a2e1920c467654a382f0d64786 => 4'840'000

    Testnet 4

    https://mempool.space/testnet4/block/0000000002368b1e4ee27e2e85676ae6f9f9e69579b29093e9a82c170bf7cf8a => 123'613

    https://mempool.space/testnet4/block/000000000bd2317e51b3c5794981c35ba894ce27d3e772d5c39ecd9cbce01dc8 => 120'000

    Signet

    https://mempool.space/signet/block/00000008414aab61092ef93f1aacc54cf9e9f16af29ddad493b908a01ff5c329 => 293'175

    https://mempool.space/signet/block/0000000577f2741bb30cd9d39d6d71b023afbeb9764f6260786a97969d5c9ac0 => 290'000

  12. in src/kernel/chainparams.cpp:410 in 44538f8ada 
     402 | @@ -391,20 +403,26 @@ class CTestNet4Params : public CChainParams {
 403 |                  .hash_serialized = AssumeutxoHash{uint256{"784fb5e98241de66fdd429f4392155c9e7db5c017148e66e8fdbc95746f8b9b5"}},
 404 |                  .m_chain_tx_count = 11347043,
 405 |                  .blockhash = uint256{"0000000002ebe8bcda020e0dd6ccfbdfac531d2f6a81457191b99fc2df2dbe3b"},
 406 | +            },
 407 | +            {
 408 | +                .height = 120'000,
 409 | +                .hash_serialized = AssumeutxoHash{uint256{"10b05d05ad468d0971162e1b222a4aa66caca89da2bb2a93f8f37fb29c4794b0"}},
 410 | +                .m_chain_tx_count = 14141057,
    jaonoctus commented at 7:09 PM on February 27, 2026:

    m_chain_tx_count seems to be wrong. Is this a typo?

    -.m_chain_tx_count = 14141057,
+.m_chain_tx_count = 13870119,

    $ bitcoin-cli gettxoutsetinfo hash_serialized_3

    {
  "height": 120000,
  "bestblock": "000000000bd2317e51b3c5794981c35ba894ce27d3e772d5c39ecd9cbce01dc8",
  "txouts": 13870119,
  "bogosize": 1142705000,
  "hash_serialized_3": "10b05d05ad468d0971162e1b222a4aa66caca89da2bb2a93f8f37fb29c4794b0",
  "total_amount": 5999799.97251533,
  "transactions": 9181935,
  "disk_size": 1023009172
}
    achow101 commented at 7:51 PM on February 27, 2026:

    No, it is correct. It's the count of transactions in the chain, not the number of UTXOs.

    jaonoctus commented at 8:25 PM on February 27, 2026:

    @achow101 Oh I see, it should match txcount from getchaintxstats instead. Pardon

    In that case, it seems to be right then.

    $ bitcoin-cli getchaintxstats 4096

    {
  "time": 1769234583,
  "txcount": 14141057,
  "window_final_block_hash": "000000000bd2317e51b3c5794981c35ba894ce27d3e772d5c39ecd9cbce01dc8",
  "window_final_block_height": 120000,
  "window_block_count": 4096,
  "window_interval": 2168096,
  "window_tx_count": 56313,
  "txrate": 0.02597348087907547
}
  13. jaonoctus commented at 7:11 PM on February 27, 2026: none

    [REDACTED]

  14. jaonoctus commented at 9:46 PM on February 27, 2026: none

    I've validated the new chainparams and headerssync against my own nodes. I'll be hosting the new torrent snapshot files at https://bitcoin-snapshots.jaonoctus.dev once this PR is merged.

    mainnet

    • m_assumeutxo_data @ 935'000
    • chainTxData @ 935'000
    • consensus.nMinimumChainWork @ 938'343
    • consensus.defaultAssumeValid @ 938'343
    magnet:?xt=urn:btih:3492d082655d173d3459f7a5e454f3dd4ed0101b&dn=utxo-935000.dat&tr=udp%3A%2F%2Ftracker.bitcoin.sprovoost.nl%3A6969&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce
    • sha256: e572ddbe456d254f05fb004cebe225bdb3656074b66f0e9b1c7fa83e1301d486

    <details>

    <summary>Details</summary>

    $ sha256sum utxo-935000.dat
e572ddbe456d254f05fb004cebe225bdb3656074b66f0e9b1c7fa83e1301d486

    $ bitcoin-cli getblockhash 935000
0000000000000000000147034958af1652b2b91bba607beacc5e72a56f0fb5ee

$ bitcoin-cli getblockhash 938343
00000000000000000000ccebd6d74d9194d8dcdc1d177c478e094bfad51ba5ac

    # tip: 935'000
$ bitcoin-cli gettxoutsetinfo hash_serialized_3
{
  "height": 935000,
  "bestblock": "0000000000000000000147034958af1652b2b91bba607beacc5e72a56f0fb5ee",
  "txouts": 164241311,
  "bogosize": 12870854130,
  "hash_serialized_3": "e4b90ef9eae834f56c4b64d2d50143cee10ad87994c614d7d04125e2a6025050",
  "total_amount": 19984148.03206779,
  "transactions": 113879165,
  "disk_size": 13290295029
}

    # tip: 935'000
$ bitcoin-cli getchaintxstats 4096
{
  "time": 1770215102,
  "txcount": 1305397408,
  "window_final_block_hash": "0000000000000000000147034958af1652b2b91bba607beacc5e72a56f0fb5ee",
  "window_final_block_height": 935000,
  "window_block_count": 4096,
  "window_interval": 2660438,
  "window_tx_count": 11723636,
  "txrate": 4.406656347563822
}

    # tip: 938'343
$ bitcoin-cli getchaintxstats 4096
{
  "time": 1772055173,
  "txcount": 1315805869,
  "window_final_block_hash": "00000000000000000000ccebd6d74d9194d8dcdc1d177c478e094bfad51ba5ac",
  "window_final_block_height": 938343,
  "window_block_count": 4096,
  "window_interval": 2346169,
  "window_tx_count": 12671917,
  "txrate": 5.40111006496122
}

    $ bitcoin-cli getblockheader 00000000000000000000ccebd6d74d9194d8dcdc1d177c478e094bfad51ba5ac
{
  "hash": "00000000000000000000ccebd6d74d9194d8dcdc1d177c478e094bfad51ba5ac",
  "confirmations": 1,
  "height": 938343,
  "version": 671891456,
  "versionHex": "280c4000",
  "merkleroot": "1bd0deca15c01a0b62b9f56b5310004d41678c8be829b2ec5fc93ff3a8041c00",
  "time": 1772055173,
  "mediantime": 1772052403,
  "nonce": 3140788553,
  "bits": "1701f303",
  "target": "00000000000000000001f3030000000000000000000000000000000000000000",
  "difficulty": 144398401518100.9,
  "chainwork": "0000000000000000000000000000000000000001128750f82f4c366153a3a030",
  "nTx": 3963,
  "previousblockhash": "00000000000000000000bf88bc08552c46937df889b9e0cfe1141da456923b3c"
}

    </details>

    testnet4

    • m_assumeutxo_data @ 120'000
    • chainTxData @ 120'000
    • consensus.nMinimumChainWork @ 123'613
    • consensus.defaultAssumeValid @ 123'613
    magnet:?xt=urn:btih:25733a7e451ca435f2901921b805c167f560424d&dn=utxo-testnet4-120000.dat&tr=udp%3A%2F%2Ftracker.bitcoin.sprovoost.nl%3A6969&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce
    • sha256: 093b44c537d207d7daf3367b00e7c71323d0163b7ae3d73f76ea05479a945f9c

    <details>

    <summary>Details</summary>

    $ bitcoin-cli getblockhash 120000
000000000bd2317e51b3c5794981c35ba894ce27d3e772d5c39ecd9cbce01dc8

$ bitcoin-cli getblockhash 123613
0000000002368b1e4ee27e2e85676ae6f9f9e69579b29093e9a82c170bf7cf8a

    # tip: 120'000
$ bitcoin-cli gettxoutsetinfo hash_serialized_3
{
  "height": 120000,
  "bestblock": "000000000bd2317e51b3c5794981c35ba894ce27d3e772d5c39ecd9cbce01dc8",
  "txouts": 13870119,
  "bogosize": 1142705000,
  "hash_serialized_3": "10b05d05ad468d0971162e1b222a4aa66caca89da2bb2a93f8f37fb29c4794b0",
  "total_amount": 5999799.97251533,
  "transactions": 9181935,
  "disk_size": 1023009172
}

    # tip: 120'000
$ bitcoin-cli getchaintxstats 4096
{
  "time": 1769234583,
  "txcount": 14141057,
  "window_final_block_hash": "000000000bd2317e51b3c5794981c35ba894ce27d3e772d5c39ecd9cbce01dc8",
  "window_final_block_height": 120000,
  "window_block_count": 4096,
  "window_interval": 2168096,
  "window_tx_count": 56313,
  "txrate": 0.02597348087907547
}

    # tip: 123'613
$ bitcoin-cli getchaintxstats 4096
{
  "time": 1772013387,
  "txcount": 14191421,
  "window_final_block_hash": "0000000002368b1e4ee27e2e85676ae6f9f9e69579b29093e9a82c170bf7cf8a",
  "window_final_block_height": 123613,
  "window_block_count": 4096,
  "window_interval": 2993163,
  "window_tx_count": 55331,
  "txrate": 0.01848579579528412
}

    $ bitcoin-cli getblockheader 0000000002368b1e4ee27e2e85676ae6f9f9e69579b29093e9a82c170bf7cf8a
{
  "hash": "0000000002368b1e4ee27e2e85676ae6f9f9e69579b29093e9a82c170bf7cf8a",
  "confirmations": 9,
  "height": 123613,
  "version": 1073733632,
  "versionHex": "3fffe000",
  "merkleroot": "0e9f83f33fc7913d7c088411675c5fc8f22fc9f796d6afde7a1b1938da4242e6",
  "time": 1772013387,
  "mediantime": 1772007382,
  "nonce": 2783855826,
  "bits": "1d00ffff",
  "target": "00000000ffff0000000000000000000000000000000000000000000000000000",
  "difficulty": 1,
  "chainwork": "0000000000000000000000000000000000000000000009a0fe15d0177d086304",
  "nTx": 1,
  "previousblockhash": "0000000009feb85d0c1076552f914835055a86032fdbcce1c821b5a624acfa00",
  "nextblockhash": "0000000007f977533c5fa7d5de287be9d3b30f63dfbf4e17648f6e5d0a4e907c"
}

    </details>

    testnet3

    • m_assumeutxo_data @ 4'840'000
    • chainTxData @ 4'840'000
    • consensus.nMinimumChainWork @ 4'842'348
    • consensus.defaultAssumeValid @ 4'842'348
    magnet:?xt=urn:btih:dfe62321ec8e9538a47e4f019d34a88510eaa751&dn=utxo-testnet-4840000.dat&tr=udp%3A%2F%2Ftracker.bitcoin.sprovoost.nl%3A6969&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce
    • sha256: eacaf9f1cdf6ddcc182ca255ffa3c423b592aede0abdbb4504079df586a22981

    <details>

    <summary>Details</summary>

    $ bitcoin-cli getblockhash 4840000
00000000000000f4971a7fb37fbdff89315b69a2e1920c467654a382f0d64786

$ bitcoin-cli getblockhash 4842348
000000007a61e4230b28ac5cb6b5e5a0130de37ac1faf2f8987d2fa6505b67f4

    # tip: 4'840'000
$ bitcoin-cli gettxoutsetinfo hash_serialized_3
{
  "height": 4840000,
  "bestblock": "00000000000000f4971a7fb37fbdff89315b69a2e1920c467654a382f0d64786",
  "txouts": 235037810,
  "bogosize": 18882533444,
  "hash_serialized_3": "ce6bb677bb2ee9789c4a1c9d73e6683c53fc20e8fdbedbdaaf468982a0c8db2a",
  "total_amount": 20999097.89823624,
  "transactions": 151886949,
  "disk_size": 16634570050
}

    # tip: 4'840'000
$ bitcoin-cli getchaintxstats 4096
{
  "time": 1770358647,
  "txcount": 536078574,
  "window_final_block_hash": "00000000000000f4971a7fb37fbdff89315b69a2e1920c467654a382f0d64786",
  "window_final_block_height": 4840000,
  "window_block_count": 4096,
  "window_interval": 1276608,
  "window_tx_count": 62368,
  "txrate": 0.04885446433047576
}

    # tip: 4'842'348
$ bitcoin-cli getchaintxstats 4096
{
  "time": 1772051651,
  "txcount": 536108416,
  "window_final_block_hash": "000000007a61e4230b28ac5cb6b5e5a0130de37ac1faf2f8987d2fa6505b67f4",
  "window_final_block_height": 4842348,
  "window_block_count": 4096,
  "window_interval": 2328088,
  "window_tx_count": 62660,
  "txrate": 0.02691479016257117
}

    $ bitcoin-cli getblockheader 000000007a61e4230b28ac5cb6b5e5a0130de37ac1faf2f8987d2fa6505b67f4
{
  "hash": "000000007a61e4230b28ac5cb6b5e5a0130de37ac1faf2f8987d2fa6505b67f4",
  "confirmations": 1,
  "height": 4842348,
  "version": 536870912,
  "versionHex": "20000000",
  "merkleroot": "6c3083cb05ca4798dd4fb9343cf544a20e8172035b8645ad946195c4e0e91a68",
  "time": 1772051651,
  "mediantime": 1772045594,
  "nonce": 1509827168,
  "bits": "1d00ffff",
  "target": "00000000ffff0000000000000000000000000000000000000000000000000000",
  "difficulty": 1,
  "chainwork": "0000000000000000000000000000000000000000000017dde1c649f3708d14b6",
  "nTx": 17,
  "previousblockhash": "0000000032167e59d45f0861dc426ec95b6d5850e69121bde56ae6eb25eebd8a"
}

    </details>

    signet

    • m_assumeutxo_data @ 290'000
    • chainTxData @ 290'000
    • consensus.nMinimumChainWork @ 293'175
    • consensus.defaultAssumeValid @ 29'3175
    magnet:?xt=urn:btih:304c3ee0ac2ce34ba64173b50d1950976544e8a3&dn=utxo-signet-290000.dat&tr=udp%3A%2F%2Ftracker.bitcoin.sprovoost.nl%3A6969&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce
    • sha256: 12d1b3f1e3488ddea251b8222e4ecf8552de2aa73c9fe05f94a08a1eb5eba367

    <details>

    <summary>Details</summary>

    $ bitcoin-cli getblockhash 290000
0000000577f2741bb30cd9d39d6d71b023afbeb9764f6260786a97969d5c9ac0

$ bitcoin-cli getblockhash 293175
00000008414aab61092ef93f1aacc54cf9e9f16af29ddad493b908a01ff5c329

    # tip: 290'000
$ bitcoin-cli gettxoutsetinfo hash_serialized_3
{
  "height": 290000,
  "bestblock": "0000000577f2741bb30cd9d39d6d71b023afbeb9764f6260786a97969d5c9ac0",
  "txouts": 59319793,
  "bogosize": 4753561406,
  "hash_serialized_3": "97267e000b4b876800167e71b9123f1529d13b14308abec2888bbd2160d14545",
  "total_amount": 12499727.17741007,
  "transactions": 11145919,
  "disk_size": 3498668523
}

    # tip: 290'000
$ bitcoin-cli getchaintxstats 4096
{
  "time": 1770163902,
  "txcount": 28547497,
  "window_final_block_hash": "0000000577f2741bb30cd9d39d6d71b023afbeb9764f6260786a97969d5c9ac0",
  "window_final_block_height": 290000,
  "window_block_count": 4096,
  "window_interval": 2459211,
  "window_tx_count": 158216,
  "txrate": 0.06433608177582159
}

    # tip: 293'175
$ bitcoin-cli getchaintxstats 4096
{
  "time": 1772055248,
  "txcount": 28676833,
  "window_final_block_hash": "00000008414aab61092ef93f1aacc54cf9e9f16af29ddad493b908a01ff5c329",
  "window_final_block_height": 293175,
  "window_block_count": 4096,
  "window_interval": 2435790,
  "window_tx_count": 164090,
  "txrate": 0.06736623436338929
}

    $ bitcoin-cli getblockheader 0000000002368b1e4ee27e2e85676ae6f9f9e69579b29093e9a82c170bf7cf8a
{
  "hash": "00000008414aab61092ef93f1aacc54cf9e9f16af29ddad493b908a01ff5c329",
  "confirmations": 1,
  "height": 293175,
  "version": 536870912,
  "versionHex": "20000000",
  "merkleroot": "664431bfbd5f0d84be6a71b5f19f936d6ecb6e3cfbbe315212b6eedc927408c6",
  "time": 1772055248,
  "mediantime": 1772050304,
  "nonce": 36906233,
  "bits": "1d150eea",
  "target": "000000150eea0000000000000000000000000000000000000000000000000000",
  "difficulty": 0.0474865840527392,
  "chainwork": "00000000000000000000000000000000000000000000000000000b463ea0a4b8",
  "nTx": 109,
  "previousblockhash": "0000000e14aa494dc78672c43bf4095b3360a597ded2fcb985ccd67aa76b0d7e"
}

    </details>

  15. Sjors commented at 5:58 PM on March 3, 2026: member

    ACK 44538f8ada868cb73ffa7a4bfb5267046d3f6b85

    <details><summary>signed</summary>

    -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

ACK 44538f8ada868cb73ffa7a4bfb5267046d3f6b85

I didn't do a full resync though.
-----BEGIN PGP SIGNATURE-----

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    </details>

  16. DrahtBot requested review from jaonoctus on Mar 3, 2026
  17. sipa commented at 2:58 PM on March 5, 2026: member

    ACK 44538f8ada868cb73ffa7a4bfb5267046d3f6b85. I re-did all the mainnet parameters, but did not look closely at the other networks.

  18. jaonoctus commented at 9:12 PM on March 5, 2026: none

    ACK 44538f8ada868cb73ffa7a4bfb5267046d3f6b85

    #34677#pullrequestreview-3869225696

  19. fjahr commented at 11:53 PM on March 6, 2026: contributor

    ACK 44538f8ada868cb73ffa7a4bfb5267046d3f6b85

    I have re-done the mainnet, testnet4 and signet params.

  20. fanquake merged this on Mar 8, 2026
  21. fanquake closed this on Mar 8, 2026
Contributors
achow101DrahtBotjanb84jaonoctusSjorssipafjahr
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Milestone
31.0

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