Abstract: Systems and methods for validating information of a user by registering a user private identifier to a registry may generate a user public key and a user private key, the keys together forming a user cryptographic public/private key pair, generate generating a nonce value using a cryptographic random generator, generate the user public identifier, wherein the user public identifier is a hash value generated by applying a cryptographic hash function to: the user public key, the nonce value, and at least one identity trait that the user has previously registered with the registry, sign the user public identifier with the user private key to obtain a signed user public identifier, generate a zero knowledge proof of the at least one identity trait; and transmit to the registry computer system: the user public identifier, the signed user public identifier, the user public key, and the zero knowledge proof.