1. Bitcoin
This is a cryptocurrency which is the original and most widely used. At present, 16.8 million bitcoin tokens are in circulation against the current cap limit of 21 million. The capitalization of the Bitcoin market changes day to day but has hit the high record of more than $200 billion. It is still considered as the poster-child of cryptocurrency industry while critics still suggest that its instability can slow down its speed, energy usage and the fees for higher transactions can put a limit on its growth.
