Gitcoin Passport was designed to make sybil resistance easy. Many systems that aim to democratically decide outcomes, like Gitcoin Grants, assume each participant is a unique human. This makes them vulnerable to sybil attacks, where a bad actor creates a large number of pseudonymous identities to subvert the service’s reputation system and gain a disproportionate amount of influence. Sybil attacks undermine the legitimacy of blockchain-based democratic pluralistic processes. Credible identity verification and reputation mechanisms are essential to combat this.