@Ali crypto currency (bitcoin, bitpesa etc.) is some form of medium of exchange used online. Us economist would prefer calling it an online commodity that acts as a derivative for the internet economy or market. It is different from paper money in others in that it is completely decentralised unlike paper money. What It means is that most central bank acknowledge its existence but have no control or regulation over it. Some economist compare it to gold. Gold can be found in reserves of countries and yet a miner can mine it at his/her farm and derive value from it.