During the review, no critical or highly severe issues were uncovered.
The most critical subjects covered in our audit are functional correctness, access control and signature malleability. The security regarding all the aforementioned subjects is high.
The general subjects covered are gas efficiency, code complexity, testing, and specification quality. Note that in the third version tests were added. The quantity and quality of tests, however, see Lack Of Testing, and gas efficiency can still be further improved.
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.