# Ownable2Step is preferred over Ownable Low/Info · Three Sigma · Hybrid orderbook DEX · 3rd April 2024 Finding 3S-Vertex-L15 of the Vertex security review. - Report: /reports/vertex - Source: https://github.com/0xsimao/audits/blob/main/Three%20Sigma/2024-04-03-vertex.pdf --- ### Description [Ownable2Step](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable2Step.sol) places some important checks, such as a 2 step ownership transfer procedure and should be preferred over [Ownable](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol). ### Recommendation Replace Ownable2Step by Ownable whenever possible. ### Status Acknowledged Disclosed by 0xSimao (https://0xsimao.com/). --- Related findings: - [Ownable2Step should be preferred over Ownable](https://0xsimao.com/findings/metazero-i-ownable2-step-preferred-ownable): MetaZero Omnichain NFTs - [Ownable2Step is preferred over Ownable](https://0xsimao.com/findings/trestle-ownable2-step-preferred-ownable): Trestle wTIA Bridge - [Ownable2Step is recommended over Ownable](https://0xsimao.com/findings/ostium-ownable2-step-recommended-ownable): Ostium