The morning Bitcoin plunged over 4000 points in a single direction, with Ethereum also dropping sharply, and the bearish momentum releasing extremely strongly. The price has effectively broken below key support, and the current rebound is weak, leaning more towards technical correction rather than a reversal. The technical structure is clearly bearish: the four-hour and daily moving averages are in a bearish alignment, the MACD has a dead cross with increasing volume, and the RSI is in the weak zone. The 83,500-84,000 USD region for Bitcoin has turned into a strong resistance, with Ethereum resistance at 2750-2780 USD. If a rebound reaches this level and faces resistance and falls back, it will confirm the continuation of the downtrend. Operationally, maintain a bearish outlook, focusing on the performance around the resistance zones mentioned above. Resistance during rebounds can be seen as an opportunity to short at higher levels. The first support below is at Bitcoin 81,000 and Ethereum 2673 USD lows; breaking these levels will open further downside space. Be sure to implement #贵金属行情下跌 $BTC risk control measures and strictly set stop-losses.