Technical analysis shows that Bitcoin's 4-hour K-line continues strongly, with consecutive bullish candles breaking through the upper Bollinger Band, highlighting strong bullish momentum and still considerable upward space. However, the rapid expansion of the Bollinger Band opening suggests increased volatility in the short term, necessitating caution against risks.

85500 has become a key watershed. If it cannot stabilize, it may retrace to the support range of 83500-84000, and may build a short-term consolidation here. It is recommended to pay close attention to the breakthrough situation of the 85500 resistance.

In terms of operations, if the price fails to stabilize at 85500, consider shorting on rallies, targeting around 84000.