SBI Crypto shut down its Bitcoin mining pool in Japan on July 31 after its hashrate fell 64% in a month. Hours later, a Hashrate Index reading put Foundry USA, AntPool and F2Pool at 60.01% of recent blocks, but weekly data show the three pools had already cleared that share before the shutdown.
SBI Crypto shut down its Bitcoin mining pool in Japan on July 31, after its seven-day average hashrate fell 64% in a month. Hours later, a Hashrate Index reading put Foundry USA, AntPool and F2Pool at 60.01% of recent blocks, and the timing makes the two events look connected. Weekly data, however, tell a messier story.
SBI Crypto's hashrate fell 64% before the shutdown
SBI Crypto's official update set the first cutoff at 22:00 UTC on July 30, or 07:00 JST on July 31, when share acceptance stopped and miners began a graceful disconnect. The company scheduled a full Stratum shutdown by 23:59:59 UTC, though its website would stay open for historical data and payout status. The final payout schedule remains unspecified, as do the end dates for API and portal access.
Daily telemetry charted the retreat: SBI's seven-day average BTC hashrate dropped from 16.222 EH/s for the period ending June 30 to 5.817 EH/s for the period ending July 30. Separate operational statistics put the 24-hour average at about 0.452 EH/s by 11:17 UTC on July 31. The pool's official block list showed July 29 as its latest block.
Three pools capture 60% of blocks
At about 11:22 UTC on July 31, Foundry held 26.67% of attributed blocks, AntPool 17.13% and F2Pool 16.21%. SBI Crypto had fallen to 0.72%, or an estimated 6.8 exahashes per second. But the dashboard moved again within minutes, so the 60.01% figure captures a moment rather than a lasting level of control.
Weekly data show concentration built for weeks
Matched weekly buckets from mempool.space put the same three pools at a combined 64.8039% for July 20. That share held at 60.7843% in the still-incomplete July 27 bucket, meaning the top tier had cleared 60% before the cutoff. Meanwhile, SBI Crypto's own share fell from 0.9804% to 0.6192% across those two weeks. Individual hashrate movements pulled in different directions: Foundry, AntPool and F2Pool each showed lower estimated hashrate in the partial July 27 bucket than the week before, while Luxor rose, Braiins fell and NeoPool was absent.
Aggregate pool records do not show where SBI Crypto's lost hashrate moved, and the July 27 bucket spans the shutdown, leaving any immediate concentration effect unmeasured.
Source: CryptoSlate
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