Ok, do they audit every bar with a chemist? What about gold plated bars?
Discussion
What would this be good for?
Ask yourself how exactly one would 100% verify that the gold is both there and real solid gold? “Looking at it” or trusting even a honest intermediary is not sufficient. This is in stark contrast to how an even a non-tech simpleton like me can quickly verify that a bitcoin UTXO sent to me is 100% real and spendable.
And so you would check every single gold bar (or whatever form of gold is there) to be sure?