The BTC flash crash is likely due to this; the three major rating agencies have downgraded their ratings. The opening of the US stock market on Monday is expected to not be good. After the market closed on Friday, Moody's downgraded the US credit rating, and all three major rating companies lowered the US from Aaa to Aa1. This is a blow to confidence in US Treasuries, and the main reason for the downgrades by the three agencies is indeed because of 'US Treasuries'.