Activate the new DAA by height instead of MTP.
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Authored by deadalnix on Nov 30 2017, 12:49.

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schancel
freetrader

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rSTAGING3e9c40071112: Activate the new DAA by height instead of MTP.
rABC3e9c40071112: Activate the new DAA by height instead of MTP.

Summary

As per title.

Test Plan

make check

Do IBD on testnet and mainnet.

Diff Detail

Repository

rABC Bitcoin ABC

Branch

daaheight

Lint

Lint Passed

Unit

No Test Coverage

Build Status

Buildable 1230
Build 1230: arc lint + arc unit

Event Timeline

deadalnix created this revision.Nov 30 2017, 12:49

Harbormaster completed remote builds in B1204: Diff 1876.Nov 30 2017, 12:49

Herald added a reviewer: Restricted Project. · View Herald TranscriptNov 30 2017, 12:49

Herald added a reviewer: Restricted Project. · View Herald Transcript

Rebase

Harbormaster completed remote builds in B1208: Diff 1881.Dec 1 2017, 13:36

schancel added inline comments.Dec 2 2017, 06:52

src/validation.cpp
1844 ↗	(On Diff #1881)	Why the rename? We should come up with a sane naming scheme for hardforks if we're going to do this regularly.

rebase

Harbormaster completed remote builds in B1230: Diff 1909.Dec 3 2017, 16:58

deadalnix added inline comments.Dec 3 2017, 17:12

src/validation.cpp
1844 ↗	(On Diff #1881)	Because that's what the hard fork contained.

I don't think you're understanding my issue. Aren't we going to ALSO have a DAA in the next HF?

We'll rename this function if that's necessary.

schancel added inline comments.Dec 4 2017, 00:09

src/validation.cpp

621

It looks to me like the DAA was active on block 504032 not 504031. Should this be strictly greater than?

See:

➜  src git:(format) bitcoin-cli getblockhash 504030
0000000000000000008088d63f48da98b7352ad7c4c85f3d90b657cf50ff1ede
➜  src git:(format) bitcoin-cli getblockheader 0000000000000000008088d63f48da98b7352ad7c4c85f3d90b657cf50ff1ede
{
  "hash": "0000000000000000008088d63f48da98b7352ad7c4c85f3d90b657cf50ff1ede",
  "confirmations": 152,
  "height": 504030,
  "version": 536870912,
  "versionHex": "20000000",
  "merkleroot": "e81d019ec9140323d3ed12af417df7cc522dfa29d81e9f241ae66426d88ae5d2",
  "time": 1510603980,
  "mediantime": 1510594229,
  "nonce": 149615656,
  "bits": "18021abd",
  "difficulty": 522462745900.0715,
  "chainwork": "0000000000000000000000000000000000000000007caeb6b06723926608dccb",
  "previousblockhash": "0000000000000000015f3aaaf642ca8ad24ac34d080db87a1a44e9a8dd35b688",
  "nextblockhash": "0000000000000000011ebf65b60d0a3de80b8175be709d653b4c1a1beeb6ab9c"
}
➜  src git:(format) bitcoin-cli getblockhash 504031
0000000000000000011ebf65b60d0a3de80b8175be709d653b4c1a1beeb6ab9c
➜  src git:(format) bitcoin-cli getblockheader 0000000000000000011ebf65b60d0a3de80b8175be709d653b4c1a1beeb6ab9c
{
  "hash": "0000000000000000011ebf65b60d0a3de80b8175be709d653b4c1a1beeb6ab9c",
  "confirmations": 151,
  "height": 504031,
  "version": 536870912,
  "versionHex": "20000000",
  "merkleroot": "ab3dd7f110f3d17a490f4f9bb3697d1a8b621eac498bcd05fcd278b024c4eb7e",
  "time": 1510606688,
  "mediantime": 1510601033,
  "nonce": 3784514661,
  "bits": "18021abd",
  "difficulty": 522462745900.0715,
  "chainwork": "0000000000000000000000000000000000000000007caf3056159e6cf330bb47",
  "previousblockhash": "0000000000000000008088d63f48da98b7352ad7c4c85f3d90b657cf50ff1ede",
  "nextblockhash": "00000000000000000343e9875012f2062554c8752929892c82a0c0743ac7dcfd"
}
➜  src git:(format) bitcoin-cli getblockhash 504032
00000000000000000343e9875012f2062554c8752929892c82a0c0743ac7dcfd
➜  src git:(format) bitcoin-cli getblockheader 00000000000000000343e9875012f2062554c8752929892c82a0c0743ac7dcfd
{
  "hash": "00000000000000000343e9875012f2062554c8752929892c82a0c0743ac7dcfd",
  "confirmations": 150,
  "height": 504032,
  "version": 536870912,
  "versionHex": "20000000",
  "merkleroot": "8ebf2179d8b1ba0aaf5f15357f963b56f53a8c6207e0156b4b6def119be61bee",
  "time": 1510606995,
  "mediantime": 1510601742,
  "nonce": 273755974,
  "bits": "1805b42b",
  "difficulty": 192765961017.7023,
  "chainwork": "0000000000000000000000000000000000000000007caf5d3801a392ac1e2266",
  "previousblockhash": "0000000000000000011ebf65b60d0a3de80b8175be709d653b4c1a1beeb6ab9c",
  "nextblockhash": "000000000000000002173d0ac7b3a30f2aac302449778d72386c785d2c370429"
}

schancel added inline comments.Dec 4 2017, 00:22

src/validation.cpp
621	I see the MTP of 504031 is `1510601033 >= 1510600000 (true)`, but I don't understand why the difficulty didn't change on that block.

When the median time past[1] of the most recent 11 blocks (MTP-11) is greater than or equal to UNIX timestamp 1510600000 Bitcoin Cash will execute a hardfork according to this specification. Starting from the next block these three consensus rules changes will take effect:
...

https://github.com/Bitcoin-UAHF/spec/blob/master/nov-13-hardfork-spec.md

schancel accepted this revision.Dec 4 2017, 01:57

This revision is now accepted and ready to land.Dec 4 2017, 01:57

Closed by commit rABC3e9c40071112: Activate the new DAA by height instead of MTP. (authored by deadalnix). · Explain WhyDec 4 2017, 02:14

This revision was automatically updated to reflect the committed changes.