One of the coolest things (and definitely the cutest) to come out of was , self-described as “a game centered around breedable, collectible, and oh-so-adorable creatures we call CryptoKitties!” ETHWaterloo CryptoKitties About a month ago, they launched a bounty on their smart contracts, and I thought I’d take a look. I found a few modest bugs (the code’s very well written) and in return they awarded me with this, my very own BugKitty: (I seriously laughed my head off when I saw what they’d designed. Well played, CryptoKitty team.) At around the same time, the game, and the value of these digital kitties, started taking off, with the one-of-a-kind ‘genesis cat’ — about $100,000 at the time. selling for nearly 250 ether That set me thinking about my own nearly-unique cat. He’s pretty awesome, but that sort of money can make a big impact. Coincidentally, my favorite charity of all time, , is doing its yearly charity drive. Worldbuilders is the creation of , who is not only an incredible author (seriously, go read ), but also a genuinely kind person. Worldbuilders runs a yearly charity lottery, stuffed with donations from sci-fi and fantasy authors, publishers and fans (along with lots of other cool stuff), and sends all their proceeds to . Worldbuilders bearded wonder Patrick Rothfuss his books Heifer International Heifer give livestock and training to disadvantaged families, to help them become self-sustaining. Here’s about the good they can do. Giving a heifer and the necessary training to care for her to a family costs about $500, but that gift can be enough to set an entire family on the road to supporting themselves and improving their conditions immeasurably. a good writeup on the Worldbuilders blog So, I listed my beloved BugCat up for auction, starting at a seemingly-insane 200 ether, and going down to 25 (CryptoKitties uses Dutch auctions, which reduce over time until someone buys them). One of the Ethereum founding team, Jeff, , and Thomas Clowes to commit to buying it if we could get enough retweets — 500 of them. expressed some interest promptly persuaded him And so , and you all retweeted. A few hours later, we hit 500 — and endless thanks to everyone who helped spread the word. By that point, Jeff was in bed, and as soon as it hit 500, I went to bed too. I tweeted Waking up in the morning, BugCat was sold — but not to Jeff. Someone by the name of ‘dimsim’ had in the night, for , making BugCat the second highest priced CryptoKitty sold so far. Did they learn about BugCat from all the retweets? We may never know. Jeff seems about this outcome. bought him 175 ether surprisingly okay 175 ether translates into after the auction house fees, and before exchange fees, and that’s a bit over $75,000 at today’s rates — or in Heifer terms, about 150 (analogue) cows. about 169.1 I’ve emailed Worldbuilders to sort out the best way of turning our Magic Internet Money into USD for the fundraiser, and I’ll post progress updates on Twitter. Please don’t forget that you can donate too — you’ll be helping a good cause, and getting a chance to win some excellent books and games in their lottery. If you , your donation will be tracked as coming from the Ethereum community. Leave your Ethereum address as a note, and I’ll send you a CryptoKitty (offer limited while stocks last). donate here Thank you to Jeff, CryptoKitties, Thomas Clowes, the pseudonymous ‘dimsim’, and all of you who helped retweet.