According to CoinMeta, a large amount of funds flowed out of the US spot BTC ETF market yesterday, with a net outflow of up to $430 million. Among them, the largest outflow was from FBTC, with a single-day net outflow of $200 million, followed by IBIT, with a total of $105 million. The spot BTC ETF tracking strategy, which is under development, shows that there is a significant positive correlation between the inflow of funds into ETF and the price of BTC.