Legendary investor Bill Miller is betting big on Bitcoin. In a recent interview with Wealthtrack, Miller explained why 50% of his personal portfolio is in Bitcoin and other Bitcoin-related investments. Part of Miller’s confidence in the apex cryptocurrency is the idea that Bitcoin is equivalent to ‘digital gold’. He said, “Only 21 million Bitcoin can ever be created… So, all you have to really believe is that the demand for Bitcoin will grow faster than 1.5% over the next number of years and the price inexorably will go up.” The investor has also put his money into several Bitcoin-related stocks like Bitcoin mining company Stronghold Digital Mining ($SDIG@US). Miller said a large part of his personal portfolio, aside from Bitcoin-related investments, is in Amazon ($AMZN@US). As of this morning, Bitcoin was trading at more than $40,000, dropping about 2% in the last 24 hours. The market-leading digital asset is down more than 13% over the last seven days.