ME News reports that on July 23 (UTC+8), Ethereum Layer 2 network Taiko released a post-mortem analysis of the security incident on June 21. The official statement indicated that the attack originated off-chain, with the attacker exploiting a leaked signing key and a detection gap to forge proofs and bypass its prover whitelist; however, zero-knowledge proof encryption remained unaffected. Taiko’s defensive measures proved effective: the daily limit on the bridge slowed fund outflows, and the Security Committee suspended the bridge and treasury operations within hours, preventing further fund movements. Taiko stated that no users suffered any losses. The attacker stole approximately $1.75 million from the cross-chain bridge and treasury, but over $11 million in funds were protected. Since network recovery, all balances on Taiko have been fully backed 1:1. (Source: Foresight News)
Taiko Discloses June Security Incident Caused by Off-Chain Signature Key Leak and Verification Oversight
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Summary
Taiko has published an on-chain analysis of the June 21 security incident, revealing that the breach resulted from a leak of an off-chain signature key and a missing verification step. Attackers forged proofs and bypassed the prover whitelist, but zero-knowledge encryption remained uncompromised. Taiko’s on-chain data and defense systems limited the damage, with daily bridge limits and a security committee response halting operations within hours. The attacker stole $1.75 million, while $11 million remained secure. All balances are now fully backed 1:1.
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