SBI shuts Bitcoin mining pool as top three pools near 60% of network hashpower
SBI Crypto, the Bitcoin mining arm of Japan’s SBI Group, shut down its mining pool on July 31 after five years of operation, according to a customer notice signed by CEO Hiroaki Morita. The pool stopped accepting hashpower at 7:00 a.m. Japan time on July 31, or 22:00 UTC on July 30, and any hashpower submitted after that point would not count toward final payouts. As of June 30, the pool’s seven-day average hash rate stood at about 20.9 EH/s, equal to roughly 2.2% of the Bitcoin network, but that figure had already fallen about 64% over the month leading up to the shutdown. SBI did not give a reason for the closure and instead directed customers to Braiins, Luxor Pool, or NeoPool. The timing has drawn attention because Hashrate Index data shows Foundry USA, AntPool, and F2Pool together recently accounted for about 60% of Bitcoin block production, with their share reaching around 64.8% in the week of July 20. If ViaBTC is added, the top four pools come close to 70%, reviving debate over mining concentration on Bitcoin.








