According to Techub News, Decrypt reported that on May 29, Grayscale updated its US spot Ethereum exchange-traded fund (ETF) document, which showed that Grayscale has selected Coinbase as the fund custodian of its Ethereum ETF. It is reported that Coinbase is currently the custodian of 90% of the total assets of the US spot Bitcoin ETF. Experts have expressed concerns about "too centralized".