Bitwise has filed a proposal for a Dogecoin exchange-traded fund (ETF), aiming to legitimize Dogecoin in the financial market.The filing comes as Dogecoin gains popularity as the world's largest memecoin, with a market capitalization of $51.60 billion.The ETF approval could attract institutional investors and provide credibility to Dogecoin, originally a joke token.The connection between Dogecoin and Elon Musk's D.O.G.E. agency adds to its appeal and symbolic weight.