From Kevin Owicki, the founder of Gitcoin, Gitcoin Passport is a dApp built on the Ceramic network that aggregates various identity attestations, called stamps, from Web2 and Web3 authenticators.  Users can collect stamps by connecting their accounts to the Gitcoin Passport algorithm and then connecting their passport with online dApps and communities.  Gitcoin passport requires no storage of personal information and has numerous use cases.