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Summary
This review focused on the additions to Grove xchain-helpers compared to Spark xchain-helpers commit 913ae38, introducing support for Arbitrum chains with ERC-20 gas tokens, Circle's CCTP v2, and LayerZero V2.
The most critical subjects covered in our audit are integration with the supported bridges, access control and functional correctness. The general subjects covered are documentation and integrity. Security regarding all the aforementioned subjects is high.
In summary, we find that the codebase provides a good level of security.
It is important to note that security audits are time-boxed and cannot uncover all vulnerabilities. They complement but don't replace other vital measures to secure a project.
About Grove xchain-helpers
GroveLabs offers a library (a fork of Spark xchain-helpers) for cross-chain messaging between Ethereum Mainnet and L2s.