Nasdaq has filed a key 19b-4 filing to list Grayscale's Hedera ETF on the U.S. Securities and Exchange Commission (SEC).Grayscale aims to expand its product offerings with the Hedera ETF which will track the price of HBAR.The SEC approval process for crypto ETFs gains momentum with filings, including the one from Grayscale.Hedera, a decentralized public network governed by council members like Google and IBM, utilizes the Hashgraph consensus algorithm.