Developers ReferencesSmart ContractsSolidity DocsgatekeepersVersion: v2.0_alphagatekeepersDocumentation for smart contracts inside the gatekeepers folder. EASGatekeeper.md FreeForAllSignUpGatekeeper.md GitcoinPassportGatekeeper.md HatsGatekeeperBase.md HatsGatekeeperMultiple.md HatsGatekeeperSingle.md SignUpGatekeeper.md SignUpTokenGatekeeper.md zupass/ZupassGatekeeper.md zupass/ZupassGroth16Verifier.md