The past 3-4 sessions saw a significant drop in bitcoin price from well above USD 8,000 to well below USD 5,000. BTC/USD lost more than 50% and even tested the USD 4,000 area. The price is currently (09:00 UTC) recovering above USD 5,000, but there are many resistances waiting on the upside.
Similarly, most major altcoins nosedived between 30%-50%, including ethereum, XRP, litecoin, bitcoin cash,