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Bitcoin’s BIP-110 moves to mandatory signaling with miner support low

BIP-110 entered the mandatory phase at block 961,632 after only 2.53% of the prior 2,016 blocks signaled support, well below the 55% threshold for early activation.

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Bitcoin Improvement Proposal 110 has entered its mandatory-signaling phase, Cointelegraph reports. The milestone began at block 961,632 on Saturday, after miners signaled support in 51 of the preceding 2,016 blocks, or 2.53%, below the 55% threshold needed for early activation.

Starting at block 961,632, nodes enforcing BIP-110 began rejecting blocks that did not set version bit 4, while ordinary Bitcoin nodes continued to accept both signaling and non-signaling blocks. Cointelegraph also reports that a minority BIP-110 branch emerged but fell behind the dominant chain, with the low signaling rate making a sustained rival chain unlikely without greater miner participation.

Cointelegraph said the deployment tests whether supporters can advance a contentious consensus change without broad miner backing, potentially separating enforcing nodes from the dominant chain and escalating disputes over how Bitcoin block space should be used. The BIP-110 proposal would impose additional consensus restrictions for roughly one year, including limits on new output scripts and certain output, data push, and witness elements, with pre-activation unspent transaction outputs exempt.

Supporters argue the restrictions would discourage inscriptions and other non-monetary data that raise storage and bandwidth costs for node operators, according to Cointelegraph. Critics cited by the outlet include Strategy Executive Chairman Michael Saylor and Blockstream CEO Adam Back, who have said the proposal could split Bitcoin and lead nodes to reject transactions allowed under existing network rules.

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