# BASE audit contest Code4rena · Ethereum layer 2 · 26th May 2023 · #3 A public audit contest on Code4rena (Ethereum layer 2), completed on 26th May 2023. 0xSimao placed #3. His findings from it are not published individually. ## What BASE is Base is Coinbase's Ethereum L2, built on the MIT-licensed OP Stack in collaboration with Optimism, with Coinbase joining as the second core development team on the stack. ## Scope Base's OP Stack deployment ahead of mainnet: the bridge and portal contracts, the deposit and withdrawal paths, and the chain configuration. ## The contest [View the contest page](https://code4rena.com/audits/2023-05-base)