On October 16th, Greeks.live macro researcher Adam posted on social media, "Bitcoin options block market data shows that in the most recent 24 hours, the proportion of Bitcoin block put option transactions has significantly increased, exceeding $1.15B, accounting for 28% of the total market turnover. The transactions are mainly concentrated in slightly out-of-the-money put options for this week and this month, with 10.4K to 10.8K being the intensive trading area. At the same time, the negative skewness of Skew has deepened, and the short-term skew is particularly obvious, with the degree of negative skewness deepening being comparable to the level on the 11th. This means that the options market, especially large players such as market makers, have a high degree of panic about the future decline, even close to the sentiment after the full market crash on the 11th. Imitating the transactions of these large players, buying put options for defense would be a better choice now." [Techflow]