From a technical analysis perspective, the four-hour chart of Bitcoin shows a clear bearish trend. The Bollinger Bands are trending downward overall, with the channel expanding. The lower band is extending downward in sync, and multiple technical indicators are resonating bearish, indicating that bearish momentum is still being released. The subsequent downward trend is clear, so the recommended strategy is to firmly go short at high levels.

Trading Recommendations:
For Bitcoin, initiate a short position around the rebound at 65,800-66,600, targeting 62,800-60,300. If the price breaks below, hold the position and continue to watch for a move toward 58,300.
For Ethereum, initiate a short position around the rebound at 1,950-2,000, targeting 1,820-1,720. If the price breaks below, hold the position and continue to watch for a move toward 1,550.