Since the middle of last year, the largest mining company Bitmain has had difficult times: it almost went bankrupt, mired in debt, reduced its own computing power from 2072 PH / s to 237.29 PH / s in a month and is experiencing a corporate conflict of the founders. Meanwhile, the main competitors increased sales, and the main pools (Bitmain, BTC.com and Antpool) lost first place to the competitors Poolin and F2Pool.