21Shares has filed a proposal with SEC for a new exchange-traded fund (ETF) tied to Dogecoin.The proposed 21Shares Dogecoin ETF tracks the Dogecoin price through reference to the CF DOGE-Dollar US Settlement Price Index.The ETF operates through passive strategies and does not apply leverage or derivatives.21Shares aims to provide a regulated method for investors to invest in Dogecoin, in collaboration with House of Doge.