Nyancoin is a cryptocurrency based on Nyan Cat and was launched in January 2014 with the words 'It is my great pleasure to announce to you all that we have partnered with the creators of Nyancat to create the first officially licensed cryptocurrency in history!'. The original announcement was on bitcointalk.org Unfortunately, the original developers mysteriously disappeared a couple of months later, without any reason or explanation. It's rumoured that they turned into Doges. Or something. The original Nyancoin website and other services ceased working shortly after that - however all was not lost, since enough people kept the software running and continued to mine the coin.