As you see on this head-spinning graph below, the total amount of money in the world is $84 trillion. But that includes money in the bank. In physical coins and notes, the total global money supply is only $31 trillion. See the problem? Hence the rise of Bitcoin and other cryptocurrencies. Bitcoin is the cryptocurrency that refuses to die. Its demise has been predicted numerous times, and one expert calculated that its value is eighteen times more volatile than the U.S. dollar. Yet the virtual money keeps going from strength to strength.