Code4rena is the web3 security auditing league. Security audit contests differ from traditional audits and bug bounties, offering protocols wider coverage and guaranteed payouts for participants. The players in the arena are: Wardens, who protect the DeFi ecosystem from threats by auditing code; Sponsors, who create prize pools to attract wardens to audit their project; Judges, who decide the severity, validity, and quality of findings and rate the performance of wardens.