Gold has an exact dimension to it, its not hard to discern really. I could dig up the picture of a particular scale but the way to quickly tell a fake from real for a gold coin is to measure both weight and exact dimensions at the same time, there is no other combination that can result in a correct balance except for gold as it is a unique element its not that hard to seperate fakes.
The only reason this isnt common knowledge is gold as common coin and exchange has fallen out of use almost anywhere and it is mostly digital now whether its FIAT or crypto or any standard, we all find digital means far more convenient then a standard from hundred years ago or earlier. The gold standard I'm most familiar with was devised by Issac Newton of more famous physics fame but theres nothing wrong with something thats worked for hundreds of years, its quite likely we do come to find a use for it at least to some extent.
I have no belief we'll have precious metal coins required as money but I'm quite certain gold will be more used in ten years or twenty years more then it is now. The possibility of FIAT decline or 'Peak Debt' is dismissed out of hand by finance establishment but then so is the need for crypto or the idea of independence via decentralisation, they all believe the world will find its own way but history says it'll crash as a corrupt system to rot and collapse. That is the natural order greater then the duration of any man or empire.
Its surely better for us to fall back on something like crypto however much elites may dislike it, if the system does work it'll be increasingly more use then a failed system.
Im no expert but these simple scales arent easy to fool so far as I know, they'll be vids on it. Theres lots of gold bugs who think we'll be 100% gold in future, I dont but it'll be a greater percentage then near to zero now.
If BTC is to be 400k it'll be part of that story of a reversion to mean that includes the story all the way back to Newton