July 27, 2010 BitcoinTalk 55 messages Proof-of-work difficulty increasing Syke Context post by Syke in BitcoinTalk topic 43. after msg5990.
September 13, 2010 BitcoinTalk 7 messages Switch to GPL Syke Context post by Syke in BitcoinTalk topic 989. after msg12494, quotes Satoshi.