Five fraudulent withdrawal requests bypassed Ankr Bridge’s verification mechanism, causing an estimated loss of $304,500, according to SlowMist. The attacker used the same transaction on Optimism but altered the recipient address, token type, and withdrawal amount. The critical issue is that all five requests carried valid signatures as verified by the system. The origin of these signatures remains unclear. While a blockchain bridge can verify signatures with high accuracy, it can still disburse funds incorrectly if it fails to cross-check the original data. So how many other protocols rely on similar mechanisms?
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