U.S. stock market opens, Dow up 0.61%, S&P 500 index up 0.58%, Nasdaq up 0.75%. MicroStrategy (MSTR.O) rises 2.9%, following reports that it purchased over 50,000 Bitcoins for $5.4 billion last week; other cryptocurrency-related stocks generally rise, Coinbase (COIN.O) up 1.5%. (Jin Ten)