# Ownable2Step is preferred over Ownable Low/Info · Three Sigma · Modular blockchain infrastructure · 27th January 2024 Finding 3S-TR-L05 of the Trestle wTIA Bridge security review. - Report: /reports/trestle-wtia-bridge - Source: https://github.com/0xsimao/audits/blob/main/Three%20Sigma/2024-01-27-trestle.pdf --- ### Description Openzeppelin [Ownable2Step](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable2Step.sol) changes transferOwnership() to a 2 step procedure, which means that to change an owner, first a pending owner is set and only then this account must accept ownership. This means that it's impossible to set the wrong address as the owner by mistake. ### Recommendation Use Ownable2Step. ### 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/vertex-ownable2-step-preferred-ownable): Vertex - [Ownable2Step is recommended over Ownable](https://0xsimao.com/findings/ostium-ownable2-step-recommended-ownable): Ostium