On January 18th, according to CryptoSlate, the size of Bitcoin ETFs has rapidly expanded. Including recently listed spot Bitcoin ETFs, the total value currently reaches $27.9 billion, approximately 647,651 BTC. Among them, Grayscale holds around 600,000 BTC. According to data from etfdb.com, the "Broad Diversified" asset category includes 22 ETFs with an AUM of $12.826 billion. Silver ranks third with five ETFs and an AUM of $11.546 billion. Although BTC is currently not included in its ETF list, if added in the future and calculated by AUM, Bitcoin would rank second and become the second-largest commodity in the United States.