Do you even comprehend what you stated?
According to Grok, gold was first used as a currency in 600 BCE. So its been around for a while.
Moreover, Gold is a physical object that can be exchanged. Other physical objects can also be used as a currency, such as oil.
According to Grok, the "value" of a fiat currency: "comes from the government's decree, or "fiat," that it must be accepted as a means of payment for all debts, public and private." As such, gold, does not qualify. It's value is derived from being publicly traded.