Everyone gets an unique address, as soon as they open the page. Another new address is created the next day, if revisited again. I can list an amount of tickets, but I cannot give an exact list since it stays in the database based on the IP address and Bitcoin address. It wouldn't be anonymouse if I did it like that, would it?
Ofcourse manipulation is possible, but I can assure you it's not happening. The only thing I can do is give you my word, I cannot publish the code since it's my code.
I don't know if it's clear, but there will be a ticket for each 0.1. The system will start and select 20 random winners, these are paid and those tickets are removed from the possible winners.
So if there are 200 tickets, the next round will select 18 winners from 180 tickets. The round after that one will select 16 winners from 174 tickets. It goes like this for 10 rounds.