In just seven weeks, dogecoin – the crypto-currency created from an internet meme based on a dog’s inner thoughts – has become an established player in the world of virtual currencies, becoming the fifth most valuable in the world. Still some way behind bitcoin’s market capitalisation of over $10 billion, dogecoin has become the fifth most valuable of more than 80 cryptocurrencies listed by website Coinmarketcap.com with a total value of $61.6 million.