Bitcoin is down about 4.4% to $86,400 which is dragging down related stocks. Coinbase is off 3.5% in premarket and Bitfarms fell nearly 8%. Major miners like Riot, MARA, Hut 8 and Bit Digital are all down between 3% and 5%. MicroStrategy also dropped 4.1%. Sentiment seems weak due to general risk-off behavior and warnings from China's central bank about digital currencies.