The only things in this world that have intrinsic value are things you can eat and use to survive. And because they have intrinsic value they are intrinsically terrible as money. Money needs to be useless for anything but money, otherwise you wind up using it up. Money gets value by the masses agreeing to pretend.
I can own a stock, which is a share of the revenue stream of a company. I can own a dollar, which is a share of the revenue stream of the taxes from producers.
When I own a bitcoin, what do I own? A hope someone buy it from me.
Go trade in your Green Stamps. You might be able to sell it as a collectors item