https://www.wsj.com/articles/coinbas...es-11618392602Coinbase, co-founded by Mr. Armstrong in 2012, runs the largest bitcoin exchange in the U.S. and was the first major cryptocurrency-focused company to go public in the country. At the close of the first day of trading, it fetched a valuation of about $85 billion, which would make Mr. Armstrong’s 20% stake worth about $17 billion. That puts the 38-year-old chief executive among the wealthiest people in the world, based on Forbes’ billionaires list.