Marathon Digital (MARA) is among the best performing stocks over the last year, having skyrocketed over 7,000%. Given the rally in Bitcoin, the surge in Marathon Digital stock is probably not surprising. As a Bitcoin miner, the company seems like a good proxy to owning the cryptocurrency and there is a strong likelihood that the Bitcoin price could remain firm. A fundamental reason behind this strength is that Bitcoin is priced against the dollar and there is no limit to the amount of dollars that can be printed. On the other hand, Bitcoin has a limited supply.