Bitcoin's BIP-110 Mandatory Signaling Window Opens with Low Miner Support

The Bitcoin Improvement Proposal (BIP) 110 has entered its mandatory-signaling window, but miners are signaling support at a fraction of the level needed to credibly move the network to a new consensus regime.

According to a BIP-110 monitor, support was present in just 51 of the 2,016 blocks preceding block 961,632, about 2.53%, far below the 55% threshold required for early activation.

The proposal aims to impose temporary limits on transaction/script and data sizes to curb non-monetary on-chain bloat, especially inscriptions. Starting at block 961,632, enforcement nodes reject blocks missing version bit 4, while non-enforcing nodes still accept them.

A minority enforcing branch formed but has not gained sufficient momentum to become the dominant chain. Critics, including Strategy Executive Chairman Michael Saylor and Blockstream CEO Adam Back, have argued that BIP-110 could divide Bitcoin and lead to situations where some nodes reject transactions that are permitted under the network’s existing rules.