Is important to consider that affectation of the BTC is not only related to Cryptocurrencies, the negative correlation with $VIX is pretty clear. There's an "investor fear" in the ambience. This is affecting huge the volatility of the market, this also affects Bitcoin, as the investors feel more comfortable. Cryptocurrencies are being volatile during this period not only because of uncertainity in the Cryptomarket, FUDs, news, regulation, but also by the fear of overall investors