Nasdaq has submitted a 19b-4 filing with the SEC to list a spot Dogecoin ETF managed by 21Shares.The proposed Dogecoin ETF will operate as a passive investment product without leverage or derivatives.Nasdaq claimed strong surveillance-sharing agreements will prevent potential manipulation in the underlying Dogecoin market.Interest in altcoin-based ETFs has increased, with multiple firms seeking SEC's regulatory clearance for various crypto-related ETFs.