OP Stack Bridge Flaw: How a Validation Gap Enabled $100M in Phantom Token Minting

This exploit exposes a critical vulnerability in OP Stack bridge architecture—a simple message validation flaw allowed attackers to mint 100 million unbacked tokens in just 2.5 hours. Bridges serve as trust gatekeepers between blockchains; vulnerabilities here directly undermine collateral assumptions across entire DeFi ecosystems and L2 scaling infrastructure. The incident underscores an urgent need for enhanced message provenance validation and mandatory security audits before deploying high-value cross-chain bridges.