I said gold and all the commodities are denominated in Dollars.

This not really true and becoming less true every day, as most states realize that the petrol-dollar is not helping anybody.

Dollars, you can give to the US Government for payment of taxes etc.

What's the etc here?

There is a corrosponding liability at the Fed.

There is no actual liability since the petrol-dollar is just paper that they regularly print to prop up their constantly collapsing pyramid scheme.