What happened Crypto miners as a whole are seeing a tremendous amount of selling pressure today. Right now, one of the biggest losers in this sector is Canaan (NASDAQ: CAN) , down nearly 25% as of 12:30 p.m. ET. At today's lows, Canaan dropped more than 28%. As a China-based crypto miner, Canaan has been hit very hard this year. Currently, Canaan is down nearly 85% from its 52-week high, mainly on news of continued Chinese regulatory crackdowns on crypto mining. However, today's news that Didi (NYSE: DIDI) has been asked to delist by Chinese authorities has sent nearly all…