I've added very interesting feature (as I think) - instant preview of the draw results - because server knows the secret it can simulate the draw like if it would stop right now and get results, so if you transaction is got confirmed, server will perform the computation and return results, so you can instantly see who will win if there would be no more transaction in this draw, and if there will be more transaction the results will be regenerated again and of course they will be completely different.

This can bring a very different feeling to the lottery, for example if you've made a large transaction and you have high odds to win, but currently there are other transactions winning, you can send a very small transaction just to "shuffle" the results.