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+Date: Wed, 26 Mar 2025 17:14:29 +0000

+To: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>

+From: "'Antoine Poinsot' via Bitcoin Development Mailing List" <bitcoindev@googlegroups.com>

+Subject: [bitcoindev] Consensus Cleanup BIP draft

+Message-ID: <uDAujRxk4oWnEGYX9lBD3e0V7a4V4Pd-c4-2QVybSZNcfJj5a6IbO6fCM_xEQEpBvQeOT8eIi1r91iKFIveeLIxfNMzDys77HUcbl7Zne4g=@protonmail.com>

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+

+Hi everyone,

+

+About two months ago i shared an update on this list about my (and others', really) work on the

+Consensus Cleanup [0]. I am now ready to share a BIP draft for a Consensus Cleanup soft fork.

+

+The BIP draft can be found here: https://github.com/darosior/bips/blob/consensus_cleanup/bip-cc.md

+

+It includes the following fixes:

+- a restriction on the timestamp of the first and last blocks of a difficulty adjustment period to

+ address the Timewarp and Murch-Zawy attacks;

+- a limit on the number of legacy signature operations that may be executed in validating a single

+ transaction to address long block validation times;

+- making 64 bytes transactions invalid to address weaknesses in the block Merkle tree construction;

+- mandating coinbase transactions be timelocked to their block height to prevent future transaction

+ duplication without resorting to BIP30 validation.

+

+This BIP draws on the 2019 Great Consensus Cleanup proposal from Matt Corallo [1]. A number of

+people contributed ideas, testing, data or useful discussions. This includes Ava Chow, Matt Corallo,

+Mark Erhardt, Brian Groll, David A. Harding, Sjors Provoost, Anthony Towns, Greg Sanders, Chris

+Stewart, Eric Voskuil, @0xb10c and others.

+

+Antoine Poinsot

+

+[0] https://gnusha.org/pi/bitcoindev/jiyMlvTX8BnG71f75SqChQZxyhZDQ65kldcugeIDJVJsvK4hadCO3GT46xFc7_cUlWdmOCG0B_WIz0HAO5ZugqYTuX5qxnNLRBn3MopuATI=@protonmail.com

+[1] https://github.com/TheBlueMatt/bips/blob/7f9670b643b7c943a0cc6d2197d3eabe661050c2/bip-XXXX.mediawiki

+

+--

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+