The whales are manipulating the market. This large sell-off is due to a simple reason, they caused a drop of $BTC to scare the entire market into selling at a loss. Bitcoin will return to the support zone of $50000 in no time, but that is not a real problem; it will rise again calmly. The real problem is SELLING AT A LOSS, that is the true strategy of the whales behind this drop we have been witnessing since the end of January.