# Arbitrum Bold audit contest Code4rena · L2 · 10th May 2024 · #3 A public audit contest on Code4rena (L2), completed on 10th May 2024. 0xSimao placed #3. 1 of his findings is published: 1 medium. ## What Arbitrum Bold is Arbitrum One and Nova rely on a permissioned validator set to prevent delay attacks, a class of attacks where actors keep opening disputes to stall on-chain confirmations for as long as they will burn capital doing it. BoLD is the dispute protocol that makes validation permissionless: an upgrade to the interactive fraud proof system securing Arbitrum chains, resolving challenges in an all-vs-all format with a fixed upper time bound. ## Scope The BoLD dispute contracts: assertion chains, challenge edges and their bisection game, and the bond accounting behind permissionless validation. ## Medium severity findings - [Inconsistent sequencer unexpected delay in DelayBuffer may harm users calling forceInclusion()](https://0xsimao.com/findings/arbitrum-bold-sequencer-unexpected-force-inclusion) ## The contest [View the contest page](https://code4rena.com/audits/2024-05-arbitrum-bold)