Nakamoto has stated that work on the writing of the code for bitcoin began in 2007.[8] On 18 August 2008, he or a colleague registered the domain name bitcoin.org,[9] and created a web site at that address. On 31 October 2008, Nakamoto published a paper on the cryptography mailing list at metzdowd.com describing a digital cryptocurrency, titled "Bitcoin: A Peer-to-Peer Electronic Cash System".[10][11][12]