The Ultimate Currency: Energy !!

There has been Five main milestones in the history of currency: 

In 1971 the money lost the gold support and the Fiat money was born. Then in the 90´s a single currency for Europe was created. In 2013 the Cryptocurrency was generated,with no dependency to a central bank. Around 2020 all world currencies disappear, and just Five types of Cryptocurrency were accepted in the world economy.

But the boldest step happened in 2030, where the Cryptocurrency system was unified in one single universal currency: Energy.

With the new technology available, the new currency worked as an Energy packets exchange, making easier the economy transactions through the  space colonies and for the flourishing  lunar new market.

Since the new currency follows the law of thermodynamics , the world economy commenced to be less dependant from the antropological factor and the irrational decisions of the markets were mitigated.
The new currency also helped to solve the complex relationship between humans and robots, based in a new constitution that governed the system in accordance with Energy flow instead of time and money.