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Bitcoin split into two chains as BIP-110 enforcing branch stalls

Miners produced 59 consecutive non-signaling blocks, leaving enforcing nodes about 57 blocks behind the dominant chain as of 6:34 a.m. UTC.

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BIP-110, a proposed temporary soft fork that would restrict some uses of arbitrary data in Bitcoin transactions, entered its mandatory-signaling window with miners producing 59 consecutive blocks that did not signal for the change, according to CryptoSlate.

CryptoSlate reports that nodes enforcing BIP-110 were left on a separate branch about two blocks long, roughly 57 blocks behind the dominant proof-of-work chain during the signaling period. As of 6:34 a.m. UTC on Aug. 9, the dominant chain was at block 961,690, while the enforcing branch sat at 961,633, with its latest block about 8 hours and 45 minutes old.

Under the BIP-110 state machine described by CryptoSlate, a compliant enforcing chain would need to reach height 963,648 to enter a LOCKED_IN stage, and restrictions would only become ACTIVE after a later milestone at height 965,664, one retarget period afterward. That means the current divergence occurred while transactions restrictions were still two stages away.

CryptoSlate also said a review of the dominant chain’s first 59 block headers in the window found no bit-4 signaling, while the enforcing branch produced two blocks at heights 961,632 and 961,633 that carried the required signal before stalling.

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