Money is a term that could be used to explain any object from the past to the present, the value of which is what the humans who use the money bestow upon it. The traditional currency known to mankind for the last few millennia has been the physical and tangible forms of money. Money in the past had assumed various shapes and forms, ranging from calcareous shells that were nothing more than the exoskeletons of the molluskan family, to plastic cards with magnetic stripes on them. Progressing further money is now in digital form stored as numbers in databases, often centralized and encrypted, safeguarded by the banks that manage the money.Now we have the digital currencies eg. bitcoin, Ethereum etc. Who approves the digital currency ?