These 20 cryptocurrencies have left bitcoin in the dust

John Bashian/Getty Images Bitcoin got all the glory in 2017 -- but these other cryptocurrencies had gains even bigger than the flagship coin. Perhaps the greatest year in the history of any single asset class has officially come to a close. At the end of 2016, the aggregate market cap of all cryptocurrencies combined was a mere $17.7 billion. But by year's end, this combined market value had skyrocketed to $613 billion, representing a better than 3,300% increase. That essentially leaves all trad...