CoinMeta data: Yesterday, a large amount of funds flowed out of the US spot BTC ETF market, with a net outflow of up to $244 million. Among them, the largest outflow was from FBTC, with a single-day net outflow of $197 million, followed by ARKB, with a total of $20.3 million. The spot BTC ETF tracking strategy developed shows that there is a significant positive correlation between the inflow of funds into ETF and the price of BTC.