Looking at the BCH four-hour K-line, the rebound rally encountered resistance at the previous high of 645 and has not broken through. From the technical indicators, the MACD golden cross signal is weak, and the RSI reached 57.6 without further momentum. All these suggest that the upward momentum is waning.

The current price at 638 is at the upper end of the consolidation range. A surge with no volume usually indicates a lack of genuine buying support and is prone to false breakouts. From this perspective, the risk-reward ratio for short positions is favorable—consider shorting, with support around the 620 area below.

The overall approach is to guard against false highs and wait for clearer short-selling signals.