The Founders argued this point. Go read what they said. It’s quite clear.
States are not permitted to coin their own money and they are required to accept Federal coinage in gold and silver as payment. Although Congress at the time allowed coins of other nations to be used. The Spanish Duobloon was used until well into the mid 1800s for example.
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I’ve often considered overpaying my taxes then demanding my refund in actual Constitutional money. i.e.,gold/silver. The US still mints gold coins. the $50 Eagle is a one ounce coin.