In this articleDOGE.CM=A visual representation of dogecoin and other cryptocurrencies.Yuriko Nakao | Getty ImagesDogecoin started out as a joke. Now it's a top-10 digital currency worth $34 billion.The cryptocurrency is based on the "Doge" meme, which rose to popularity in late 2013. The meme portrays a Shiba Inu dog alongside nonsensical phrases in multicolored, Comic