BIP-110 and BLAKE2b: what actually forked

BIP-110 is a Bitcoin proposal to restrict non-financial data in transactions for a year. It asked for 55% of hashrate to signal support and peaked near 2.6%, and nodes running it began rejecting blocks that did not signal at height 961,632 on 8 August 2026. That is the moment the chain split. This chain is the BIP-110 branch; the majority chain carried on under SHA-256d, unaffected.

The proof-of-work change is a separate, later decision on this branch. On 30 August 2026 it moved from SHA-256d to BLAKE2b with a Sia-style header: block 961,639 was the last SHA-256d block and 961,640 the first BLAKE2b one. Everything else is still Bitcoin — the 21 million cap, the halving schedule, script, addresses, and every block of history before the split.

So “BIP-110” is what people call this chain, but BLAKE2b is what decides your hardware. Any ASIC built for Siacoin mines here on stock firmware; no SHA-256 machine can produce a valid share at all. Because the pre-split history is shared with Bitcoin, generate a fresh address for this chain and keep SHA-256 keys well clear. Lazarus Pool mines it with TIDES payouts in the coinbase and a 0% fee through your own DATUM gateway.