There’s something about cats and the internet. Felines are leading the way to making the complicated technology of blockchain a bit more user-friendly. CryptoKitties, a game in which one can buy, trade or breed cartoon cats, crept its way into the hearts of attendees at a Canadian hackathon in October. The game launched publicly on Thanksgiving, and players have since spent an estimated $21 million buying or breeding to get a genetically unique kitty based on “cattributes,” which are traits such as special colors, patterns, googly eyes, no necks, duck wings and other crazy stuff.