The U.S. SEC has directed issuers to withdraw their 19b-4 filings for ETFs based on Solana, XRP, Cardano, Litecoin, Dogecoin, Polkadot, Hedera, and Ethereum staking, following the approval of new generic listing standards. The change simplifies ETF approval, allowing these assets to be listed through an expedited S-1 filing process. Withdrawals are expected to begin as early as this week.