Are you a qualified assayer? You trust the other person is giving you gold, or you trust the individual who tests it. You trust the system that provides you wit

Are you a qualified assayer? You trust the other person is giving you gold, or you trust the individual who tests it. You trust the system that provides you with an understanding of the relative value of the gold you're holding so that you aren't massively overpaying. There's a reason Jesus through the money changers out of the temple - they were abusing that 3rd party trust.