The Qubic network resumed operation on October 19, advancing its blockchain beyond tick 85,371,949 for the first time since a security breach halted activity on Sunday. The restart followed approval of a recovery plan by the project's validators, known as Computors, and the launch of a claims platform for users whose wallets were compromised.

According to the project's update, roughly $1.4 million in QU tokens was drained from 1,404 accounts after an attacker exploited predictable wallet seeds generated by a vulnerable web wallet. The flaw, tied to an insecure random-number generator in versions prior to 4.26.4, affected seed creation on certain Apple devices and browsers. Qubic confirmed the vulnerability was patched in the updated web wallet released on October 19.

Affected users can verify their addresses and submit claims through the reclaim platform, with a deadline of May 1, 2027, to file. The project emphasized that anyone who created a wallet using the vulnerable version must treat it as compromised and migrate funds to a new wallet generated by version 4.26.4 or later. The warning was issued without assigning blame to specific parties, focusing instead on technical remediation steps.

The incident underscores ongoing challenges in blockchain security, particularly around wallet implementation and cryptographic randomness. While the network has restarted and recovery mechanisms are now accessible, the episode highlights the importance of timely software updates and rigorous security audits in decentralized systems.