The Federal Reserve announced a slowdown in tapering, causing Bitcoin to rebound by more than 5% from below $83,000, briefly breaking through $87,000. Analysts at QCP Capital pointed out that traders' sentiment is turning bullish as call options become more expensive or there is higher demand than put options, contrasting with the situation earlier this week. However, Amberdata's Director of Derivatives Greg Magadini believes macro uncertainties still exist and option skewness may turn bearish again. (Note: The so-called "skewness" refers to the difference in volatility between put/call options in the options market).