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KYC is an abbreviation for Know Your Customer, which requires banks and similar institutions to collect identifying information on their customers, which authorities can use to track and prosecute those customers.

I wonder if KYC violates the 4th amendment potentially.

It certainly violates the 10th, and regardless of it's relation to the text of the Constitution, subjects property owners to the power of government overlords to enjoy the use of their property, which is contrary to the principle of sovereignty.