Sure, but if Warhol had each of his prints signed with an unforgeable signature akin to a private key, while we still have to know what is private key was, the

Sure, but if Warhol had each of his prints signed with an unforgeable signature akin to a private key, while we still have to know what is private key was, the Warhol Authentication Board wouldn't have been in the mess that it was in.