In order to become a safe-haven asset like gold and the US dollar, Bitcoin price fluctuations must have a significant negative correlation with the price fluctuations of risky assets, that is, one of the two rises and the other falls, or one falls and the other rises. And this negative correlation must be long-term and stable. Although Bitcoin has shown hedging characteristics in the past year, the time frame has been expanded. In 3 years, 5 years or even longer, the hedging characteristics of Bitcoin are not obvious and unstable. It can be seen that Bitcoin's hedging characteristics have yet to be verified by time, and it is called "digital gold".