Bitcoin BIP-110 Enters Mandatory Signaling Phase as Miner Support Remains Below 3%

Bitcoin Improvement Proposal 110 (BIP-110) has entered its mandatory-signaling phase, but miners have sent the required signal in only a small fraction of recent blocks—raising doubts about whether the contentious ruleset can gain enough support to sustain a rival chain.

According to a BIP-110 monitor, at block 961,632 on Saturday miners signaled support in just 51 of the preceding 2,016 blocks, equivalent to 2.53%. That falls well below the 55% threshold the mechanism expects for early activation. While nodes enforcing BIP-110 began rejecting blocks that did not set version bit 4, standard Bitcoin nodes continued accepting both signaling and non-signaling blocks—creating a potential split between enforcing and non-enforcing participants.

Key takeaways

• BIP-110 moved into a mandatory-signaling enforcement window at block 961,632, with enforcing nodes rejecting blocks lacking version bit 4.
• Miners signaled only 2.53% of the time in the preceding 2,016 blocks—far under the 55% level referenced for early activation.
• A BIP-110-compliant minority chain briefly emerged but quickly lagged behind the dominant chain.
• The proposal aims to temporarily restrict on-chain data to reduce storage and bandwidth pressure, but critics warn it could force rule-divergent behavior across the network.