@fillippone
I see a little difference comparing it with Bitcoin. You may rent a vault, you paid for a service, the bank is not supposed to know what there is in. Banks don't size your gold, governments do. It's also the reason why people store their gold in countries where the governments can't size it like Belgium or Switzerland. You also have the certificate so if something happens it could be called a robbery
With Bitcoin you can run a full node and nobody ever will be able to steal your bitcoin.
Regarding Gold: you can desposit your gold in Bank of England and still they can refuse to give you such gold.
This a huge difference in favour of bitcoin.
This is why you should run a Bitcoin full node (follow my guide in signature if you can speak Italian).