BTC market analysis and strategy are as follows: Today, BTC did not reach the upper Bollinger Band at 91,650, which is a major resistance. In the morning, it reached around 90,000 and then dropped directly to around 86,880. The major support below Bitcoin is at 84,888. In the afternoon, it also tested a support level for long positions. As long as this level does not break downward, you can consider buying around the support, with a stop loss at 86,400. For resistance, you can refer to the nearby daily chart resistance level and attempt to short. In the short term, buy around 87,250 with a take profit at 87,888, and set the stop loss at 86,759. For short positions, short around 88,000 with a stop at the previous high of 88,200. These are short-term trades; once the price rises or falls to the stop-loss level, the short-term order becomes invalid. Please be aware of the risks.