Billy Markus, the Co-founder of Dogecoin, a meme-based cryptocurrency, has sold a 'Capped Doge' NFT for 20.7727 Ethereum or nearly $70,000. The NFT was inspired by multiple requests received by Markus to 'cap the doge'. He also sold a 'Dogecoin Alpha' card for nearly $30,000 as part of a six-card NFT series he referred to as "unique, single mint" collectibles.