Shares of the Chinese Bitcoin miner Riot Platforms (NASDAQ: RIOT) traded more than 10% higher earlier today. Shares of Hut 8 Mining Corp (NASDAQ: HUT) traded as much as 19% higher today but now only trade about 8% higher, while shares of HIVE Blockchain Technologies (NASDAQ: HIVE) were up about 14% but now are only up about 4.5%. Riot, Hut 8, and HIVE Blockchain are all Bitcoin miners, meaning their business model involves trying to mine as many Bitcoin as possible in the most efficient manner.