The ranking of bitcoin is to be consider under what factors.is it to be considered under market capitalization or in terms of its existence among the cryptocurrencies.To rank bitcoin in terms of currencies, we might want to consider it under a digital currency, and it is  actually globally accepted. when viewed under the Cryto Currency, Bitcoin is the first of all the Crypto Currency,that even though not globally accepted,it  is use globally for online transactions, tradings and others uses.This will rank Bitcoin first among the Crpto Currency. Next   to it is the Ethereum  which is close to bitcoin and like bitcoin many are also investing in Ethereum. There are other currencies outside crypto Currecy, like the pounds and dollars that are higher in ranking to bitcoin.