{"id":551265,"date":"2026-08-01T20:05:49","date_gmt":"2026-08-01T19:05:49","guid":{"rendered":"https:\/\/cryptoslate.com\/?p=551265"},"modified":"2026-08-01T10:11:49","modified_gmt":"2026-08-01T09:11:49","slug":"a-major-japanese-bitcoin-mining-pool-just-pulled-the-plug-on-its-bitcoin-service-just-as-3-mega-miners-claimed-60-of-the-network","status":"publish","type":"post","link":"https:\/\/cryptoslate.com\/a-major-japanese-bitcoin-mining-pool-just-pulled-the-plug-on-its-bitcoin-service-just-as-3-mega-miners-claimed-60-of-the-network\/","title":{"rendered":"A major Japanese Bitcoin mining pool just pulled the plug on its Bitcoin service just as 3 mega-miners claimed 60% of the network"},"content":{"rendered":"<p>By the time SBI Crypto pulled the plug on its Bitcoin pool in Japan on July 31, its seven-day average hashrate had fallen 64% in a month. Later that day, a <a href=\"https:\/\/hashrateindex.com\/hashrate\/pools\">Hashrate Index<\/a> reading put Foundry USA, AntPool and F2Pool at 60% of recent blocks. The timing makes them look connected. Weekly data tell a messier story.<\/p>\n\n<div class=\"cs-article-embed\">\n    <a href=\"https:\/\/cryptoslate.com\/bitcoin-miner-concentration-just-exposed-a-gap-in-bitcoins-six-confirmations-rule\/\" class=\"cs-article-embed__link\">\n        <div class=\"cs-article-embed__body\">\n            <span class=\"cs-article-embed__related-reading\">Related Reading<\/span>\n            <h3 class=\"cs-article-embed__title\">A rare Bitcoin reorg just showed why six confirmations may not guarantee a final payment<\/h3>\n        <\/div>\n        <span class=\"cs-article-embed__arrow\" aria-hidden=\"true\">\n            <i class=\"fa-light fa-arrow-up-right\"><\/i>\n        <\/span>\n    <\/a>\n<\/div>\n\n<p><a href=\"https:\/\/announcements.sbicrypto.com\/en.announcements.json\">SBI Crypto's official update<\/a> set the first cutoff at 22:00 UTC on July 30, or 07:00 JST on July 31. Share acceptance stopped, and miners began a graceful disconnect. The company scheduled a full Stratum shutdown by 23:59:59 UTC. Its website would stay open for historical data and payout status. The final payout schedule remained unspecified, as did the end dates for API and portal access.<\/p>\n<p>At about 11:22 UTC on July 31, Foundry held 26.67% of attributed blocks, AntPool 17.13% and F2Pool 16.21%. SBI Crypto was down to 0.72%, or an estimated 6.8 exahashes per second. The dashboard moved again within minutes. The 60.01% reading captures a moment, rather than a lasting level of control.<\/p>\n\n<div class=\"cs-article-embed\">\n    <a href=\"https:\/\/cryptoslate.com\/bitcoin-defi-rootstock-hashrate\/\" class=\"cs-article-embed__link\">\n        <div class=\"cs-article-embed__body\">\n            <span class=\"cs-article-embed__related-reading\">Related Reading<\/span>\n            <h3 class=\"cs-article-embed__title\">84% of BTC hashrate secured Bitcoin DeFi in Q1, but miners saw little fee upside<\/h3>\n        <\/div>\n        <span class=\"cs-article-embed__arrow\" aria-hidden=\"true\">\n            <i class=\"fa-light fa-arrow-up-right\"><\/i>\n        <\/span>\n    <\/a>\n<\/div>\n\n<p>SBI Crypto's <a href=\"https:\/\/pool-api.sbicrypto.com\/api\/external\/v1\/public\/hashrates?resolution=38&coins=BTC\">daily telemetry<\/a> charted a month-long retreat. Its 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. By 11:17 UTC on July 31, separate <a href=\"https:\/\/stats.sbicrypto.com\/poolstats\">operational statistics<\/a> put the 24-hour average at about 0.452 EH\/s. SBI's official block list showed July 29 as its latest block.<\/p>\n<p><a href=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/07\/exec-13dab907-b465-4252-a1a9-9fe3acd5e4f1.png\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-551327\" src=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/07\/exec-13dab907-b465-4252-a1a9-9fe3acd5e4f1.png\" alt=\"Infographic comparing SBI Crypto's seven-day average Bitcoin pool hashrate decline from 16.222 to 5.817 EH\/s with Foundry USA, AntPool and F2Pool's combined 60.01% rolling block share on July 31, noting no verified migration path.\" width=\"720\" height=\"1080\" srcset=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/07\/exec-13dab907-b465-4252-a1a9-9fe3acd5e4f1.png 1024w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/07\/exec-13dab907-b465-4252-a1a9-9fe3acd5e4f1-200x300.png 200w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/07\/exec-13dab907-b465-4252-a1a9-9fe3acd5e4f1-683x1024.png 683w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/07\/exec-13dab907-b465-4252-a1a9-9fe3acd5e4f1-768x1152.png 768w\" sizes=\"(max-width: 720px) 100vw, 720px\" \/><\/a><\/p>\n<h2>The top three were already above 60%<\/h2>\n<p>Matched weekly buckets from <a href=\"https:\/\/mempool.space\/api\/v1\/mining\/hashrate\/pools\/1m\">mempool.space<\/a> put Foundry, AntPool and F2Pool at a combined 64.8039% for July 20, then 60.7843% in the still-incomplete July 27 bucket. SBI Crypto's share fell from 0.9804% to 0.6192%. The top tier had cleared 60% before the cutoff. The July 27 bucket spans the shutdown and remains incomplete, leaving any immediate concentration effect unmeasured.<\/p>\n<p>Individual pool movements pulled in different directions. Foundry, AntPool and F2Pool each showed lower estimated hashrate in the partial July 27 bucket than in the prior week.<\/p>\n<p>Luxor rose, Braiins fell, and NeoPool was absent. Pool-share records reflect work credited to a service.<\/p>\n<p>Thus, the routes behind SBI Crypto's lost pool hashrate stay hidden in these aggregate totals.<\/p>\n\n<div class=\"cs-article-embed\">\n    <a href=\"https:\/\/cryptoslate.com\/foundry-mined-over-a-third-of-all-bitcoin-blocks-in-the-past-week\/\" class=\"cs-article-embed__link\">\n        <div class=\"cs-article-embed__body\">\n            <span class=\"cs-article-embed__related-reading\">Related Reading<\/span>\n            <h3 class=\"cs-article-embed__title\">Foundry mined over a third of all Bitcoin blocks in the past week<\/h3>\n        <\/div>\n        <span class=\"cs-article-embed__arrow\" aria-hidden=\"true\">\n            <i class=\"fa-light fa-arrow-up-right\"><\/i>\n        <\/span>\n    <\/a>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>The leaders were already dominant before the cutoff, and aggregate data do not identify a destination for SBI\u2019s lost pool hashrate.<\/p>\n","protected":false},"author":1264,"featured_media":551450,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77968,2376],"tags":[81073,78295,80591],"post_folder":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.9 (Yoast SEO v21.9.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>A major Japanese Bitcoin mining pool just pulled the plug on its Bitcoin service just as 3 mega-miners claimed 60% of the network<\/title>\n<meta name=\"description\" content=\"SBI Crypto\u2019s Bitcoin hashrate fell 64% before its pool shutdown, while weekly data show the top three pools were already above 60%.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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