The Ankr cross-chain bridge attack involves three assets valued at approximately $303,600.

on November 9, according to The Defiant, the Ankr Ethereum cross-chain bridge was attacked, with the attacker transferring out five types of tokens via five withdrawal transactions. Three of the assets were estimated to be worth approximately $303,600 based on Etherscan prices, while the other two tokens were excluded due to lacking price quotes.

The report states that all five withdrawals referenced a small deposit on Optimism made on November 3, which had previously already been withdrawn on Ethereum. The new withdrawal calls utilized modified receipt data, pointing to different receiving addresses and larger amounts. On-chain records show the withdrawals passed the bridge contract's authorization check, but how the attacker obtained the accepted authorization could not be determined.