What if you had invested $1,000 in Marathon Digital in the summer of 2019? Here's what you'd have today. The company now known as Marathon Digital Holdings (MARA -4.38%) wasn't always a powerhouse of Bitcoin (BTC -0.06%) production. By the summer of 2019, it had dipped its first toe into the Bitcoin-mining waters, but its core business still consisted of monetizing a portfolio of acquired patents and other intellectual property. With a total market value of $22 million, Marathon's stock teetered on the edge ...