A couple of months ago we had a problem with a lottery when 6 blocks were mined very quickly before the file had been downloaded and tweeted out and we had to delay the draw. After that week we changed to using the 12th block rather than the 6th so this wouldn't happen again. However, due to a bug, only the block number displayed in the text file was changed to the 12th block and the 6th block was still used for the actual draw.

That means last weeks lottery was actually from the hash of block 526873 instead of 526879.

If you let me know your user ID we would like to pay you a bug bounty for finding this.