By one projection, two of the world's preeminent digital assets can roughly quadruple in value over the next three years. Over the last century, no asset class has come particularly close to matching stocks on an annualized return basis. But over the last decade, cryptocurrencies have run wild and left the stock market's major indexes in their dust. Although the vast majority of the digital currency landscape is highly speculative, the largest cryptocurrencies and blockchain projects are garnering the atten ...