Bitcoin (BTC) is fluctuating today at around $87,000. Key resistance is at $88,200 - $88,800, and support is at $86,000. The 4-hour RSI is overbought, and the MACD shows a death cross, increasing the risk of a short-term pullback, but the daily trend remains bullish. If it breaks below $86,000, it may test $84,500; if it breaks above $88,800, it could challenge $90,000. The market is paying attention to ETF fund flows and signals from the Federal Reserve, and short-term volatility may increase, so cautious operation is advised.