There is no currency in this world that can be compared to cryptocurrency presently and past.
The world is now becoming a world of technology where physical things won't have any meaning.
Before telephone they were sending letter to post office from one place to another as a means of communication but nowadays it is of no use anymore due to technology.
Technology is taking over everything including money and I know that is why cryptocurrency exist cryptocurrency is a digital and online based money.
Physical money won't be useful anymore in no time and cryptocurrency online currency will take over the world of money