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Summary
The most critical subjects covered in our audit are integration with the supported bridges, access control and functional correctness. The general subjects covered are unit testing, documentation and trustworthiness. 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 Sky xchain-helpers
Sky implements a library for cross-chain message passing along with contracts able to receive cross-chain messages. The latest version reviewed adds support for LayerZero.