Crypto stocks tumbled in premarket trading.Big Digital fell 8.9%,The9 fell 7.7%,Riot Blockchain fell 7.6%,Marathon Digital fell 6.7%,Canaan fell 6%,Coinbase fell 3.8% and SOS fell 5%.Bitcoin prices were sinking into correction territory Sunday, marking the sharpest slide for the digital asset since February, coming on the heels of what has been a remarkable stretch for the crypto industry.Bitcoin prices fell at one point Sunday afternoon to $51,907, down around 20% from a recent peak of $64,829.