syntax = "proto3"; package bet.beteran.c2se.backend.identity; // subject = bet.beteran.c2se.backend.identity.CheckUsernameForDuplication // subject = bet.beteran.c2se.backend.identity.CheckNicknameForDuplication // subject = bet.beteran.c2se.backend.identity.Captcha // subject = bet.beteran.c2se.backend.identity.Signin