BIP-54, formally often known as “Consensus Cleanup,” would make 4 slender adjustments to Bitcoin’s core guidelines. The proposal is designed to shut previous weaknesses and strange edge instances, not add new methods to make use of Bitcoin. Its supporters say that distinction issues: That is preventive upkeep for a community now price excess of it was when a lot of its guidelines have been written.
The proposal’s authors are Antoine Poinsot, a Bitcoin Core contributor related to Chaincode Labs, and Matt Corallo, a longtime Bitcoin developer. Corallo first raised the broader concept in 2019. Poinsot revived and expanded the work in late 2023 and early 2024, and the proposal obtained its formal BIP-54 designation in April 2025. The specification was marked full in Might 2026 after testing and implementation work.
The Proposal Goals to Shut 4 Previous Gaps
The primary repair is meant to handle a possible “timewarp” assault on Bitcoin’s mining problem. Bitcoin recalculates the issue of mining each 2,016 blocks, roughly each two weeks, to maintain block manufacturing close to one block each ten minutes. A majority of the community’s mining energy might exploit how Bitcoin measures time throughout these intervals, utilizing manipulated timestamps to make blocks seem slower to supply than they actually have been.
Over time, that would push mining problem down. In an excessive case, an attacker with majority hash price, the computing energy used to mine Bitcoin, might drive problem to its lowest setting in roughly 38 to 40 days. That would theoretically let the attacker produce blocks far quicker than regular, quickly create new cash, increase the community’s database of unspent cash, and disrupt time-based cost contracts comparable to these utilized by the second layer protocol, the Lightning Community.
BIP-54 would add timestamp limits initially and finish of every 2,016-block interval. The principles are supposed to block the traditional timewarp technique and a associated variation often known as the Murch-Zawy assault, whereas leaving atypical mining unchanged.
BIP-54 Additionally Intends to Shield Smaller Node Operators
The second change targets “poison blocks,” legitimate blocks intentionally designed to take an unusually very long time for computer systems to confirm. Sure older Bitcoin transaction scripts can require minutes and even hours of processing on atypical {hardware}. An attacker might use them to gradual the community, improve the possibility that miners waste work on stale blocks, and make it tougher for individuals to function unbiased Bitcoin nodes.
BIP-54 would cap older, pre-Segregated Witness (SegWit) transactions at 2,500 legacy signature operations. Signature operations are the cryptographic checks used to show that somebody is permitted to spend bitcoin. Regular transactions use far fewer, and SegWit and Taproot transactions wouldn’t be topic to this restrict. Supporters estimate the change might cut back the worst-case verification burden by about 40 instances in some instances.
The third change closes an issue in Bitcoin’s Merkle tree, the system that mixes transactions into one abstract for every block. A transaction precisely 64 bytes lengthy can resemble an inside piece of that construction. That creates a technique to forge a proof that would mislead some simplified cost verification, or SPV, wallets into accepting a transaction that was by no means confirmed.
BIP-54 would merely make 64-byte transactions invalid. These transactions have been nonstandard for years and are hardly ever used. The proposal’s supporters argue that banning them fixes the underlying drawback extra cleanly than anticipating each gentle pockets to make use of a workaround.
A Last Rule May Simplify Bitcoin’s Future
The fourth change considerations coinbase transactions, the particular transactions by means of which miners obtain newly issued bitcoin and transaction charges. In Bitcoin’s early years, an identical coinbase transactions appeared in multiple block, which brought on the sooner transaction’s unspent outputs to vanish. Bitcoin added checks to stop a repeat, however these checks add complexity to dam validation.
BIP-54 would require new coinbase transactions to incorporate settings tied to the block top, or its place within the blockchain. That will assure uniqueness going ahead and will finally permit nodes to take away the older duplicate-transaction checks. The change might make validation less complicated and help future designs geared toward decreasing the storage burden of working a full node.
F2pool’s Place Makes Activation More durable
The technical case for BIP-54 has not ended the political debate. Wang Chun, co-founder of the most important mining pool F2pool, acknowledged on Aug. 10 that he doesn’t help the proposal. He defined that F2Pool would replace its mining nodes if BIP-54 reached the required majority by means of an ordinary BIP-9 activation course of, however the pool won’t sign for it beforehand.
Chun’s objection, shared again in April on X, is essentially about course of and priorities. He has argued that packaging 4 adjustments collectively resembles bundling unrelated measures into one invoice. He considers a number of of the dangers too distant to justify the coordination, software program upgrades and group consideration required for a mushy fork, which adjustments Bitcoin’s guidelines in a method that older software program could not implement.
Supporters see bundling otherwise. They argue that each consensus change carries a excessive social value, so combining a number of defensive fixes can cut back the variety of troublesome networkwide activation efforts. Additionally they say Bitcoin’s rising worth provides attackers extra motive to discover weaknesses that when regarded theoretical.
BIP-110’s Collapse Provides Contemporary Warning
The controversy arrives simply after the failure of BIP-110, a separate proposal that sought briefly to limit nonfinancial information saved in Bitcoin transactions. It focused practices related to Ordinals inscriptions, massive OP_RETURN information and a few Taproot-based information storage. Its decrease activation threshold failed to draw significant miner help, and a small chain imposing the proposal stalled after producing a small handful of blocks.
That episode doesn’t make BIP-54 an identical proposal. BIP-54 doesn’t add or take away general-purpose script options, neither is it a path to covenants or OP_CAT, proposals that will increase Bitcoin’s programmable spending choices. Nonetheless, BIP-110 demonstrated how rapidly a disputed improve can grow to be a broader argument about who ought to resolve Bitcoin’s future.
BIP-54 is already lively for testing on Bitcoin Inquisition, a Signet-based check atmosphere, and present Bitcoin Core releases have adopted associated coverage protections. Some mining swimming pools, together with MARA and ViaBTC, have voluntarily begun producing suitable coinbase transactions. However formal activation parameters haven’t been set, and a mainnet vote stays open.
The subsequent query is whether or not builders, the group, companies, node operators, and miners can agree that fixing identified however hardly ever exploited dangers is price one other hard-fork-level coordination effort. Readers ought to look ahead to a proper BIP-9 signaling proposal, further miner readiness bulletins, and whether or not F2pool’s resistance prevents the broad help Bitcoin upgrades have historically required.
