The digital currency ETFs issued in the past were "futures ETFs", while this one is a "spot ETF", meaning that the underlying assets of the ETF are different. From the perspective of price fluctuations, spot ETFs and futures ETFs are very similar, both aiming to accurately track the price of BTC and help investors obtain exposure to BTC. However, compared to futures ETFs, the underlying assets of which are Bitcoin futures contracts, the operation of spot ETFs is less complex and the fees are lower.