Qubic restarts blockchain, opens recovery claims after $1.4M hack
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Layer-1 blockchain Qubic has restarted its network and launched a recovery process after a wallet seed vulnerability allowed an attacker to drain roughly $1.4 million in QU tokens from 1,404 accounts, according to the project’s latest update. Qubic’s blockchain explorer shows the network resumed processing ticks 8:00 pm on Oct. 19, advancing beyond tick 85,371,949, where it was halted on Sunday. Qubic said its network validators, known as Computors, had approved a recovery plan and that the project had launched a claims platform for affected wallet holders. Affected users can check their address and submit a claim through Qubic’s reclaim platform. Affected users have until May 1, 2027, to submit claims, according to Qubic. The network was halted Sunday to prevent further movement of stolen funds after attackers exploited predictable wallet seeds generated by vulnerable wallet software. The vulnerability affected wallet seeds generated using Qubic’s web wallet on certain Apple devices and browsers, where an insecure random-number generator could produce predictable seeds. Qubic on Sunday said it had fixed the seed-generation flaw in the latest version of its web wallet.
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Qubic freezes chain after attacker drains 1.4K wallets with weak seeds
Layer-1 blockchain network Qubic halted operations Sunday after an attacker reportedly exploited weakly generated wallet seeds to drain approximately $1.4 million from more than 1,400 accounts, according to the project. In a statement on X, Qubic said the network was halted at tick 85,371,949, where it remains paused at the time of writing. Qubic said the vulnerability affected wallet seeds generated using any browser on an iPhone or iPad, Safari on a Mac until Oct. 18, 2026, or the Qubic iOS app before July 2025, leading to 2.94 trillion Qubit (QU) stolen. “87.1% of the drained funds never left the Qubic network and remain frozen in place,” said Qubic. “The remaining 12.9% was sent to MEXC, whose team froze the receiving account within about an hour.” The Qubic theft is the latest in a series of attacks tied to weak wallet seeds. In July, Coldcard disclosed that attackers had stolen funds from wallets whose seeds were weakened by a firmware bug. Similar flaws affected Trust Wallet’s browser extension and the Libbitcoin Explorer tool in 2023.
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