Cointelegraph reports that, according to Trader T's monitoring data, physical Bitcoin exchange-traded funds (ETFs) in the U.S. saw net inflows of $39 million over the past day. This figure reflects the growing demand for investment tools in physical Bitcoin. As a financial product, ETFs allow investors to invest in Bitcoin assets through stock markets without directly purchasing and storing digital currencies. With the continuous development of the cryptocurrency market, this form of investment is gaining more attention.