Safest investment is gold no matter what currency a country uses gold is excepted.
That’s one opinion I do not share.
I presume your “excepted” means accepted. If so try taking a one ounce Krugerrand (worth about $2600) to the store for a load of groceries.
Or a gold bar to the dealer for a new car.
In the US you will be laughed at. Many other countries you will be robbed and lucky to escape with your life.