I'm not really talking about cryptocurrency. What I mean is that you could fit cryptographic electronics on a coin that would make counterfeiting impossible. I don't think that technology would fit on a flexible paper bill yet.
However, it is interesting to consider that you could integrate a national cryptocurrency with physical coins. The benefit would be that people could transact the physical coins without recording anything publicly. Also, the physical coins would also be instantly redeemable for digital currency.
Oh, hell yeah. Now, how do I open a link to a post on a different instance than mine from within my instance (also without getting sent to my browser)?