Bitcoin soft fork proposal BIP-54, known as Consensus Cleanup, was completed in May 2026 as a narrowly scoped package of four consensus rule changes designed to fix long-standing edge cases without adding new Bitcoin functionality. The proposal, developed by Antoine Poinsot and Matt Corallo, would address a potential timewarp attack on mining difficulty, limit legacy signature operations to reduce the risk of slow-to-verify poison blocks, invalidate 64-byte transactions to close a Merkle tree weakness that could mislead some SPV wallets, and require unique coinbase transactions tied to block height. F2Pool co-founder Wang Chun said on Aug. 10 that he does not support the proposal at this stage, though he added that F2Pool would update its mining nodes if BIP-54 wins the required majority through the standard BIP-9 process. He said the pool would not signal support in advance. BIP-54 is already active for testing on Bitcoin Inquisition, a Signet-based environment, and some mining pools, including MARA and ViaBTC, have voluntarily begun producing compatible coinbase transactions. Final activation parameters have not been set and a mainnet vote remains open. The debate follows the failed BIP-110 effort to restrict some non-financial data in Bitcoin transactions, but BIP-54 is framed instead as preventive maintenance for a more valuable network rather than a change to Bitcoin's general scripting capabilities.