Nasdaq has filed a 19b-4 with the SEC to list and trade Grayscale's spot Hedera ETF.Hedera network operates on the Hashgraph consensus algorithm and is governed by a council that includes Google and IBM.NYSE Arca has also filed a 19b-4 for Bitwise's Dogecoin ETF with a 75% approval chance.The surge in crypto ETF applications in the U.S. is driven by optimism around a crypto-friendly SEC.