You say this
Let me think of the ancient Chinese banknotes
Ancient China
Large business groups had issue banknotes
There are three hidden verification codes on the top of the banknote.
The merchant that collects the money, check the verification code to confirm the true and false of the banknote
The average person gets the money, because he won't look at the hidden verification code, and he doesn't know how to check it. Therefore, it is impossible to verify the true and false of the banknote. It can only be judged by experience and has certain risks.
As you said:
If the person who created the treasure map at the same time creates a verification code at the same time, then if she asks the other party to say the verification code, she checks her code and the code of the other party.
If combination is ok that the other party is true, and did not need to get his things.
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