The BIP-110 soft fork has entered the only activation path it has left, and it did so with almost no one behind it. Bitcoin’s mandatory signalling window opened at block 961,632 on 9 August 2026 with miner support hovering around 2.5 percent — roughly a twentieth of the 55 percent threshold the proposal originally sought. The window runs to block 963,647, with activation projected near block 965,664 in early September if enforcement holds.
Key takeaways: Miner signalling sits near 2.5 percent against a 55 percent target; the mandatory window is now the only remaining route; a temporary chain split is a live technical possibility rather than a rhetorical one; a separate eCash hard fork is scheduled around block 964,000 in the same month.
What BIP-110 Actually Proposes
BIP-110, formally the Reduced Data Temporary Softfork, would cap the amount of arbitrary non-financial data a Bitcoin transaction may carry, for a trial period of roughly one year. The target is inscription-style payloads, oversized OP_RETURN outputs and similar uses that treat the chain as a data layer rather than a payment ledger.
Supporters argue this defends node operating costs and keeps Bitcoin’s validation set decentralised. Opponents argue that filtering transaction content by policy is a political act dressed as a technical one, that the limits are trivially circumvented, and that a temporary rule change sets a precedent that will not stay temporary. Neither camp has moved much in months.
Why the BIP-110 Soft Fork Refuses to Die at 2.5 Percent
Ordinary soft forks lock in when miners voluntarily signal past a threshold. That never happened here. Signalling has come mainly from Ocean, independent miners and small operators, while the pools that matter — Foundry, AntPool, ViaBTC and F2Pool — have not moved.
The mandatory signalling window is the fallback: nodes running BIP-110 rules reject blocks that do not set the relevant version bit. It is a node-led activation rather than a miner-led one, which is precisely what makes it contentious. A minority of economic nodes attempting to compel a supermajority of hashrate is the exact configuration Bitcoin’s governance culture has spent a decade trying to avoid.
One prominent developer has floated a proof-of-work-changing hard fork as an escalation if the threshold is not met — a reminder that the tail risk in this dispute is not confined to a data limit.
The Chain Split Mechanics, Plainly
If signalling stays near current levels when enforcement begins, the behaviour splits three ways:
- Upgraded nodes reject non-signalling blocks and follow the small minority chain that does signal.
- Non-upgraded nodes accept both kinds of block and follow whichever chain has the most accumulated proof of work — which, at 2.5 percent signalling, is the other one.
- Exchanges, custodians and miners sit in the middle, and their deposit and withdrawal policies determine whether a technical split becomes an economic one.
The practical exposure for institutions is not ideological. It is operational: replay handling, deposit crediting, confirmation thresholds and whether a counterparty is running upgraded software. Any desk with Bitcoin settlement obligations through September should be asking its custodian those four questions this week, not next month. Our weekly Bitcoin market read tracks how spot has absorbed the news so far, and the crypto ecosystem guide sets out who the players in a fork dispute actually are.
What It Means
The most likely outcome remains that BIP-110 fails to activate meaningfully and the chain continues as it is. Hashrate is overwhelmingly against it, and a minority chain with 2.5 percent of security is not a viable network. But “most likely” is not “certain”, and the second scheduled protocol event of the month — an eCash hard fork near block 964,000 around 21 August — means the operational calendar is crowded regardless of how BIP-110 resolves.
There is a longer arc underneath the noise. The same debate about what Bitcoin’s block space is for now runs alongside a genuine post-quantum migration discussion, after a March 2026 Google Quantum AI paper cut the estimated qubit requirement to break Bitcoin’s signature scheme to under 500,000. Compared with that, a one-year data cap is a small argument. It is being fought this hard because it is really an argument about who gets to decide.
Frequently Asked Questions
What does the BIP-110 soft fork change?
It would temporarily limit the amount of arbitrary non-financial data a Bitcoin transaction can carry, for about one year, targeting inscription-style payloads and oversized OP_RETURN outputs. It does not alter supply, issuance or the proof-of-work algorithm.
Will BIP-110 cause a Bitcoin chain split?
A temporary split is technically possible if nodes enforcing BIP-110 reject the overwhelming majority of blocks that do not signal. With signalling near 2.5 percent, any resulting minority chain would carry very little hashrate, so most observers expect the dominant chain to continue unaffected. Custody and exchange policies, not the protocol, will determine the practical impact.
Sources: bip110.org, CoinDesk, AMINA Bank research.
This article is for information only and is not financial advice. Always do your own research before making any investment decision.
