We build in other challenges that proves that Bob knows a registered secret (which only he knows), that can only be generated by Bob. There are many zero-knowledge proof (ZKP) methods that Bob can show that he knows a secret when challenged, and that he and the token provider have agreed on. A few ZPF methods are outlined here: https://asecuritysite.com/encryption

Professor of Cryptography. Serial innovator. Believer in fairness, justice & freedom. EU Citizen. Auld Reekie native. Old World Breaker. New World Creator.

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