cross-chain
SKILL.md
Cross-Chain Vulnerability Patterns
This skill provides comprehensive knowledge for identifying cross-chain and bridge vulnerabilities in smart contracts.
Overview
Cross-chain communication introduces trust assumptions at chain boundaries. Message verification is the entire security model - if messages can be forged or replayed, billions can be stolen.
Historical Context
| Hack | Loss | Root Cause |
|---|---|---|
| Ronin Bridge | $624M | Compromised validators |
| Wormhole | $326M | Signature verification bypass |
| Nomad | $190M | Initialization bug allowed fake proofs |
| Harmony Horizon | $100M | Compromised validators |