SatoshiWon.com is a provably-fair lottery. Understand here why.
During each round, there is an encrypted server hash in SHA-256. An example of a such server hash is given above.
The Server Hash consists decrypted of two parts:
[Bitcoin Block Hash of the latest round]:[Random Number between 1 and 65536]
On the page "Round History" you can see a Winner Hash and the Verify Hash.
The Winner Hash basically consists the Server Hash and the recent Bitcoin Block Hash captured on choosing a winner:
[Bitcoin Block Hash of the previous Round]:[Random Number between 1 and 65536]:[Recent Bitcoin Block Hash]
The Verify Hash is nothing else than the encrypted server hash, so the first two parts of the above string. This looks decrypted accordingly:
[Bitcoin Block Hash of the previous Round]:[Random Number between 1 and 65536]
The Verify Hash can be used to verify the authenticity of the winner hash. What is essential is the Winner Hash.
The winning ticket number is derived from the winner hash by encrypting the winner hash in MD5 and removing all non-numeric characters.
The resulting numbers will be calculated with modulo using the number of tickets. The result of that is the position of the winner.
To find out which numbers your tickets have, please go to the "Dashboard" and click on "Show Tickets". You'll find a list of your purchased tickets within the current round.