$BTC update, Sep 15: Bitcoin is trading around $76.4K, down 3.1% in 24 hours and 2.7% over 7 days, after failing to hold the $79K-$80K area. The market is focused on the U.S. Senate’s CLARITY Act vote today and the Fed rate decision tomorrow, keeping volatility elevated. $75K is the key downside level, while reclaiming $78K-$80K would restore short-term momentum.