First, humans exchanged commodities. You could eat it, burn it for energy, modify it to create tools or jewelry. You exchanged something useful for something useful.
* It was energy.
Then, humans exchanged commodities for gold. You couldn't eat it or burn but it was still possible to modify it.
* It was poor energy.
Then, humans used papers checks or bank notes. It wasn't very useful, but you still could burn it during a very cold winter.
* It was very poor energy.
Now, we wants to use Cryptocurrencies. You can't do anything with it.
* It is not energy but proof of destruction of energy.
Something looks wrong. We should exchange potential energy, not destroyed energy.
From the ancient times, nothing is free, you have to pay something then only you will get something in return, this is the very common rule from the very ancient times but the mode of payment and the evolution of currencies has been occurred and in this flow of energy has been decreased and in todays mode of payment the follow of energy is just ended. Earlier people use barter system where they exchange goods in exchange of goods then comes the exchange of gold and now money is given in exchange of goods and I think in future bitcoin will be exchanged.