Bitcoin Blake2b Hard Fork
Block #961640 marks where Bitcoin split again: after miners rejected BIP-110, a minority switched the proof of work from SHA-256d to BLAKE2b and launched an independent chain that continued from Bitcoin's history.
This event is part of Bitcoin history — See the full Bitcoin timeline
The BLAKE2b Split
On August 30, 2026, at block #961,640, Bitcoin went through another division: after miners rejected activating BIP-110, a minority group switched the proof of work from SHA-256d to BLAKE2b and launched an independent chain (BTCB2) that continued from Bitcoin's history.
Unlike previous forks, this one was not about block size — it changed the mining algorithm itself. Bitcoin (BTC) continued uninterrupted on SHA-256d, while the new chain, adapted to BLAKE2b ASICs (originally built for coins like SiaCoin), started with its own history from the last shared block.
