After the ETF is approved, Bitcoin will be priced in US dollars and officially become a US dollar-denominated asset. The US dollar index is directly related to the trend of Bitcoin, that is, when the US dollar index rises, Bitcoin will fall, and vice versa. When Bitcoin rises or falls, we must refer to the index trend. Now the 4-hour rise of the index has not ended, Bitcoin will continue to fall in the 4-hour period, but the extent of the decline is uncertain.