[Taiko: Attack Incident Caused by Off-Chain Signature Key Leak and Verification Process Oversight] Odaily Planet Daily reported that Ethereum Layer 2 network Taiko released a review of the June 21 security incident, stating that the attack was caused by an off-chain signature key leak and verification process oversight. The attacker exploited this to forge proofs and bypass the Prover whitelist, rather than compromising ZK cryptography or smart contracts. The attacker stole approximately $1.75 million from the cross-chain bridge and Vault, but over $11 million in assets were protected, and no user funds were lost. Taiko has fixed the vulnerabilities, restored the pre-attack state, and relaunched on July 2. OpenZeppelin's audit confirmed that the fixes did not reveal any high, medium, or low-risk vulnerabilities. The official statement also mentioned that the Unzen upgrade, scheduled for August 6, will require ZK proofs to be submitted for every block to further enhance network security.