in this sense it is still a legal tender in the developing countries, in addition to digital money is still being developed in several countries, not many people know about bitcoin and as product innovation will continue to be developed in the near future, I think bitcoin this is more effective and efficient. 
Well, No money innovation would be complete without mentioning cryptocurrency and theres no space here to explain how bitcoin works. But much like Tide, salt, stones or many of the other weird things weve used to represent value; users of Bitcoin agree on its worth due to the transparent technology it is built on. The original invention of money allowed people to ascribe value to a person.