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 HOw would you know what Joe Biden (or any prominent persons) digitial signature was or whether they had an assistant using their key? 
 I don't know tbh. Does verification need to have multiple layers on top of each other? I may research this 
 At some level a social consensus builds up for accepting a private key signing as that individual. How do you know the Nostr account for  @ODELL is really him for example?