Bitcoin
Security Breaches Affect Liquid Sidechain, Symbiosis Bridge, and Revolut Customer Records
Three separate security incidents within a week resulted in stolen Bitcoin, minted bridge tokens, and compromised user transaction data.
A sequence of three separate security breaches occurred over a single week, affecting different segments of Bitcoin-related infrastructure. On September 6, an attacker exploited a bug in the Elements range-proof cache on Blockstream's Liquid sidechain, minting unbacked L-BTC and withdrawing nearly 4,000 BTC worth around $320 million. While 3,400 BTC was returned following a bridge patch, the attacker demanded a bounty on the remaining 598.5 BTC, leaving roughly $47 million unrecovered after Blockstream refused the terms. The underlying code patch had been public on GitHub five days prior but was not deployed.
On September 11, cross-chain protocol Symbiosis suffered an exploit on its BridgeV2 contract, where an attacker generated approximately 46.1 billion unbacked syBTC. The exploiter swapped 4.39 WBTC on Uniswap for about $336,000 before trading was caught. Symbiosis subsequently recovered 15 BTC, offered a 20% bounty, and suspended its Bitcoin bridge operations.
A third incident involved digital bank Revolut, which disclosed on September 12 that attackers used a fraudulent law-enforcement portal to obtain sensitive customer files. The compromised data included passports, photos, IBANs, and complete Bitcoin transaction records for high-net-worth users. While client balances were not drained, the exposure of transaction histories creates targeted phishing risks for affected account holders.
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