Bitcoin’s next soft fork could focus on longstanding consensus vulnerabilities rather than broader new functionality, according to developer Matt Corallo. The proposal, known as the Great Consensus Cleanup (BIP-54), could also give developers experience coordinating an upgrade after years of disagreement over protocol changes.
In the Decrypt article published on November 5, 2026, at 06:46:03 UTC+8, Corallo estimated an 80% chance that BIP-54 would be Bitcoin’s next soft fork. That was his assessment—not an agreed activation plan. No formal timeline had been established.
Four vulnerabilities targeted
First proposed in 2019, BIP-54 addresses what Corallo, a co-author of the proposal, described as accumulated “cruft” in Bitcoin’s consensus design. Speaking with MARA Foundation head Isabel Foxen Duke on MARA Foundation TV, he said the issues were real concerns but not an immediate crisis.
The proposal targets four areas:
- Poison blocks: A miner could construct a block that exploits performance bottlenecks, slowing validation for other nodes and temporarily gaining an advantage over competitors.
- Time warp bugs: Miners controlling a majority of hashrate could exploit timestamp rules within Bitcoin’s two-week difficulty adjustment window to accelerate block issuance artificially.
- Merkle malleability: Because a 64-byte transaction has the same data size as an internal Merkle tree node, an attacker could theoretically forge proofs that lead light clients to accept fake transactions.
- Duplicate coinbase transactions: Historical quirks allowing duplicate transaction IDs are set to resurface at future block heights, potentially overwriting existing coins or disrupting ledger accounting.
A maintenance upgrade, with a broader coordination test
Not everyone sees the proposed cleanup as a significant advance. Paul Sztorc, co-founder and CEO of LayerTwo Labs, described its potential activation on X as “kind of depressing,” calling it “a janitorial maintenance fork that doesn’t do anything.”
Sztorc nevertheless reported that developers he surveyed at TABconf in Atlanta predominantly expected BIP-54 to be Bitcoin’s next soft fork. The earliest estimate he cited was September 2027, while most pointed to 2028 or later. Those were informal expectations, not scheduled activation dates.
The debate follows years of friction over protocol changes after Taproot’s activation in 2021. Broader proposals, including OP_CAT (BIP-347) and OP_CHECKTEMPLATEVERIFY (BIP-119), have struggled to secure ecosystem-wide consensus amid arguments about Bitcoin’s “ossification.”
Corallo said the obstacles are increasingly social and political as well as technical. Taproot’s activation process, for example, prompted months of debate over miner-signaling thresholds and mandatory user flag days.
His hope is that a comparatively focused cleanup could establish an activation process that future upgrades could reuse. In that sense, BIP-54 would test not only fixes to consensus rules, but also whether Bitcoin’s participants can agree on how to deploy another soft fork.
Source: Original Decrypt article. The supplied article identifies André Beganski as a senior content manager at MARA Foundation who previously worked for Decrypt.