Bitcoin Holders Face a Hard Fork on September 1 — Here’s What Actually Changes

Bitcoin mining pool OCEAN announced that its chairman and chief technology officer, Luke Dashjr, has resigned. The departure coincides with a hard‑fork proposal that will activate on September 1, switching the forked chain to the BLAKE2b mining algorithm, which is incompatible with existing Bitcoin ASIC hardware.

Background on the split

During August, OCEAN’s hashrate fell dramatically, dropping about 96 % after the pool routed miners to a minority chain for roughly 18 hours without clear consent. The move sparked internal pressure for leadership changes, culminating in Dashjr’s exit and the pool’s repurchase of his equity.

Technical change: BLAKE2b

The proposed fork replaces Bitcoin’s current SHA‑256 proof‑of‑work with BLAKE2b. Dashjr argues that this change eliminates the ASICBoost shortcut, which he claims gives large miners an efficiency advantage and concentrates mining power. Critics, including notable figures such as Adam Back and David Schwartz, have dismissed the rationale as unfounded.

Potential impact on Bitcoin holders

On the day of the fork, Bitcoin (BTC) was trading near $77,655, down 0.59 % for the day but up 23.3 % for the month. Miners have been leaving the network for AI‑related contracts, reducing overall hashrate and potentially limiting the number of machines that could support the new chain.

Holders face two practical considerations:

• Replay risk – whether transactions on one chain can be replayed on the other.
• Wallet tracking – ensuring their wallet follows the intended chain. Dashjr recommends using a light wallet rather than a full node.

The previous fork attempt by Dashjr failed to attract more than 3 % miner support, leading to a stall after two blocks. The September 1 event will test whether sufficient hashrate will follow the BLAKE2b algorithm or if the split will stall as in August.

What remains unchanged

OCEAN will continue operating as a non‑custodial mining pool, while the original Bitcoin chain will persist under its existing consensus rules. The forked chain, sometimes referred to by Dashjr as “Spamcoin,” will operate as a separate cryptocurrency with its own governance and mining parameters.