{"rewrite":{"id":"r_4e169b1f96a059177dff8495","clusterId":"c_47144181288f84b8e0b783c9","slug":"symbiosis-bridge-halted-after-46-1-billion-fake-sybtc-minted","model":"deepseek-v4-1-flash","headline":"Symbiosis Bridge Halted After 46.1 Billion Fake syBTC Minted","summary":"On September 11, an attacker minted roughly 46.1 billion syBTC on the cross-chain protocol Symbiosis using about 25 cents of Bitcoin. Before the attack, only 13.91 syBTC existed. Symbiosis says two bugs caused it: one misidentified the sender as an administrator, and another let a negative fee increase the deposit amount. Blockaid says the attacker sold about 4.39 WBTC on Uniswap v4 for roughly $336,000. Symbiosis estimates about $770,000 in provisional losses.","whyItMatters":"The two bugs turned a deposit-check error into a balance error, so the bridge's own accounting created syBTC with no Bitcoin behind it, and the halt plus the planned audit leave the bridge's resumption date open.","webCardHtml":"\u003cp\u003eThe attacker spread the work across 12 fraudulent deposit transactions on BNB Chain, Ethereum, and Rootstock in about four minutes, according to blockchain data confirmed by CoinDesk. Symbiosis\u0026#39;s report traces the failure to two separate faults: the deposit confirmation process checked the wrong part of the Bitcoin transaction and treated the attacker as the bridge administrator, which let the minimum fee be set below zero, and the fee deduction then added to the deposit instead of subtracting from it. The syBTC issued in the attack has no backing of real Bitcoin, so extracting value required swapping it for assets held elsewhere.\u003c/p\u003e","blueskyPost":"Symbiosis says two bugs did it: an admin check that misread the sender and a negative fee that grew the deposit. The syBTC supply went from 13.91 to 46.1 billion, so the token's backing collapsed before any market moved.","twitterPost":"Symbiosis had 13.91 syBTC before the attack. Two bugs, an admin misread and a negative fee, let one wallet mint 46.1 billion.","threadsPost":"Symbiosis blames two bugs for the 46.1 billion fake syBTC: one misidentified the sender as an administrator, the other let a negative fee raise the deposit. Only 13.91 syBTC existed before, so the mint had no backing to match it.","newsletterBlurb":"An attacker minted about 46.1 billion syBTC on the Symbiosis bridge using roughly 25 cents of Bitcoin, when only 13.91 syBTC existed beforehand. Symbiosis traces the failure to two bugs: a deposit check that misread the sender and granted administrator rights, and a fee deduction that added to the deposit when the fee went negative. The attacker sold about 4.39 WBTC on Uniswap v4 for roughly $336,000, and Symbiosis estimates about $770,000 in provisional losses. The bridge stays halted while the team rewrites the Bitcoin-side software and seeks an audit.","attributionJson":"[{\"source\":\"GIGAZINE\",\"url\":\"https://gigazine.net/news/20260916-bitcoin-fake-token/\",\"title\":\"About 46.1 billion 'fake BTC tokens' created from just about 39 yen worth of Bitcoin, exploiting negative fees through two bugs\"}]","lintFlagsJson":null,"lintHits":0,"costUsd":0,"inputTokens":4647,"outputTokens":685,"status":"published","repairAttempts":0,"nextRepairAt":null,"factsAttemptedAt":1789539265,"createdAt":"2026-09-16T06:12:00.000Z","publishedAt":"2026-09-16T06:13:20.000Z","updatedAt":"2026-09-16T06:13:20.000Z"},"cluster":{"id":"c_47144181288f84b8e0b783c9","canonicalTitle":"わずか約39円分のビットコインから約461億枚の「偽BTCトークン」が作られる、2つのバグでマイナス手数料を悪用","representativeArticleId":"a_6757724e3b013c97884a1438","sourceCount":1,"writtenSourceCount":1,"writeAttempts":0,"isSolo":true,"entitiesJson":"{\"anime_titles\":[],\"manga_titles\":[],\"work_titles\":[\"Symbiosis\",\"syBTC\",\"Bitcoin Bridge\"],\"studios\":[],\"people\":[],\"type\":\"news\",\"domain\":\"other\",\"is_roundup\":false}","contentType":"news","status":"published","firstSeenAt":"2026-09-16T05:00:00.000Z","lastSeenAt":"2026-09-16T05:00:00.000Z","updatedAt":"2026-09-16T06:13:20.000Z"},"attribution":[{"source":"GIGAZINE","url":"https://gigazine.net/news/20260916-bitcoin-fake-token/","title":"わずか約39円分のビットコインから約461億枚の「偽BTCトークン」が作られる、2つのバグでマイナス手数料を悪用"}],"entities":{"anime_titles":[],"manga_titles":[],"work_titles":["Symbiosis","syBTC","Bitcoin Bridge"],"studios":[],"people":[],"type":"news","domain":"other","is_roundup":false},"keyFacts":null}