Assume that there are 100 users in the lottery and each of them has 10 tickets.
User A owns ticket numbers from 1 to 10. User B owns ticket numbers from 11 to 20, and so on. Every week freebitco publish a list in
their twitter to let all users know ticket numbers they own.
Let's say the first ticket picked is ticket number 5. The user A wins the first prize. If the second ticket number is between 1 and 10, that's discarded and calculations are done again.
You can click on "This lottery is provably fair" in "lottery" section and read the full explanation.
Thanks for the explanation! I am pretty sure I'd read it before but I don't recall this full explanation where tickets are discarded if a person who owns them already wins a prize, but maybe I wasn't thinking of all these scenarios before:)
Glad to know that if I can win, it's always going to be the bigger prize. One day... one day...