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cross-chain-security

Cross-chain security patterns for multi-chain Solidity deployments and bridge interactions. Use when deploying contracts across multiple chains, integrating with bridges, or handling chain-specific behavior differences. Covers message replay, finality, and chain-specific gotchas.

skills/cross-chain-security/SKILL.md

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# Cross-Chain Security

## Message Replay Across Chains

Signatures and messages valid on one chain can be replayed on another if the chain ID isn't included.

```solidity
// VULNERABLE: no chain ID in domain separator
bytes32 DOMAIN_SEPARATOR = keccak256(abi.encode(
    keccak256("EIP712Domain(string name,address verifyingContract)"),
    keccak256("MyProtocol"),
    address(this)
));