Digital asset manager Hashdex has taken another step in its proposal to offer a combined spot Bitcoin and Ether exchange-traded fund in the United States. On June 24, the firm submitted an S-1 registration statement for its Hashdex Nasdaq Crypto Index US ETF, which will track certain cryptocurrency assets in the Nasdaq Crypto US Settlement Price Index — a daily closing value of the Nasdaq Crypto Index which measures the performance of a significant portion of the digital asset market. The fund currently only seeks to include Bitcoin (BTC) and Ether (ETH), but the filing suggests that more asse…