gold although its hard to mind but its not that finite, so its supply is ever growing, and only rich people can mine it so distribution of ppwer to hold it is limited only to few, unlike bitcoin its limited only and 21m can be mined.
Yes I agree, it's hard to know even know how much are the gold reserves all across the world. The supply will just keep growing and there is clearly a lack of transparency about how they deal with this information.