I see I'm going to have to walk you through this slowly.

Chances are you will not pay your dentist with something tangible, be it sardines or cash. The same is true of the majority of transactions. Instead, you will ELECTRONICALLY transfer the funds. Nothing tangible changes hands. The transactions are conducted with no exchange of anything physical or visible.

I'm not making a value statement about bitcoin or Ethereum or any of the other crypto-currencies. I'm simply saying that the concept is valid, with some clear advantages over the way currency is manufactured now.