in the permissionless blockchains because the secret key of the OPRF would be known by everyone, and the forward secrecy of the scheme that would provide security even if the secret key is known would not be of any use because the object identifiers ObjID would be easily predictable (i.e., derived from national identifiers). SPARTA[@sparta] provides pseudonyms through a distributed third-party-based infrastructure; however, it requires non-anonymous pre-registration. UnlimitID[@unlimitid] provides anonymity to OAuth/OpenID protocols, although users must create keypairs and keep state between and within sessions, a requisite that is not allowed in the current scenario. Another proposal for anonymous pseudonyms with one Trusted-Third Party[@Yilek_traceableanonymous] requires a division of roles between the TTP and the server that is not coherent in a permissionless blockchain. With Self-Certified Sybil-free Pseudonyms[@MKAP08; @DBLP:conf/wistp/AnderssonKMP08], the user must keep state (i.e., dispenser D) generated by the issuer during enrollment and the Sybil-free identification is based on unique featurs of the devices, not on the user identity. Another anonymous authentication using smart cards[@smartcardAnonAuth] is only anonymous from an eavesdropping adversary, not from the authentication server itself. TATA provides a novel way to achieve Sybil-resistant anonymous authentication: members of an induction group must interact and keep a list of 