Bitcoin’s BIP-110 supporters split onto minority chain as main network pulls ahead
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Bitcoin's (BTC) blockchain split into two branches Saturday when nodes running BIP-110 began rejecting blocks that did not signal support for the controversial "anti-spam" proposal.
Key facts
BIP-110’s restrictions on transaction data will only lock in if the BIP-110 chain reaches block 963,648
As The Block previously reported, Bitcoin Core developers changed the software’s default OP_RETURN policy in its Oct. 2025 v30 update to effectively remove its longstanding 83-byte limit
Once BIP-110 nodes rejected the main chain block at height 961,632, they could no longer follow any later block built on top of it
That dispute produced BIP-444, an October 2025 proposal to restrict arbitrary data through consensus rules rather than optional relay settings
Summary
BIP-110 is a proposed one-year rule that would restrict non-financial data on the Bitcoin blockchain, such as Ordinals inscriptions. The split began at block 961,632, opening a two-week period during which BIP-110 nodes will require every new block on the forked chain to signal support. ET, Bitcoin’s main chain had reached block 961,640. The competing blocks at height 961,632 both build on block 961,631 but contain different sets of transactions.