How can we know the game isn't rigged?
The old trick of the papers with numbers isn't a fair way to select the winners because we can't verify every single ticket in the basket. I would say it's complex to trust on a site like this. But good luck with the project.
I'm sure that there would be absolutely no reason for Jumbo Ticket to cheat their users, but a high standard of trust is necessary from the user to the service, with the service being a centralized entity. From my post before, I believe a good feature to have for online Bitcoin lotteries would be to get the results from the Block Hash of the Block Header of a predetermined block. It would remove all questions of manipulation.
Well, that would make a lot of sense after all Jumbo Tickets have made it clear several times they will do it in the fairest way possible. We're just waiting for the announcement in early June if I'm not mistaken. As already stated, the draw is for 1 month with the number of winners only around 70 users. It's good luck if this happens to a forum member who participates and leaves a review here.