gold is not scarce. it is a myth. new gold is found every day. there is an unlimited amount of gold that can be mined.

how do you even know that central banks own any gold? they are serial liars. they could make this up.

also all gold backed currency failed because all centralized currencies become corrupt. what happened was that all the gold was lent for high interest, leveraged and at the end the depositors could not get their gold back and the currency failed. same as all ponzi fiat currencies. they will get it back but hyperinflated and worthless at the end.