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.
Earlier the mode of buying and selling of goods was barter system where they have to exchange goods in exchange of goods then comes the taking gold in exchange of goods , it was a kind of investment also that one you take gold in exchange of your goods , you could save it for future use till the valuation of gold increases then you can earn the profit also in this mode of payment but as the time passes, the payment system becomes very convenient and easy and now people take money or currency for buying or selling things , this is the best method I guess but there is no flow of energy in this method