Ankr Cross-Chain Bridge Attack Results in Loss of Approximately $304,500

On November 9, blockchain security firm SlowMist reported that the Ankr cross-chain bridge was attacked, resulting in a loss of approximately $304,500. The attacker exploited a legitimate Optimism transaction to submit five forged cross-chain receipts, altering the recipient, token, and withdrawal amount. All five receipts bore valid signatures from trusted consensus signers of the cross-chain bridge, and the withdrawal function released the assets without independently verifying the actual events on the source chain. The source of the unauthorized signatures is still under investigation, and it has not yet been confirmed whether the signers were compromised.

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