YABTCL means Yet Another BiTCoin Lottery.
But it isn't just another bitcoin lottery system, it's the most complete provably fair lottery system available so far.
The draws will occur three times in a week: Tuesdays, Thursdays and Saturdays at 24:00 UTC;
In each draw 6 numbers in a total of 67 will be drawn;
Tickets price start at 0.001 BTC;
You can buy tickets having between 6 to 16 numbers;
With each ticket you can win hitting 2 to 6 numbers.
The pools are created by the users;
There are two types of pools: Share-a-Ticket and Add-a-Ticket;
In the Share-a-Ticket pool, the owner buy the tickets and define to how many quotas the total value of the tickets will be divided. The owner can define a service charge for this type of pool.
In the Add-a-Ticket pool, the owner define how many tickets can be added to it and how many numbers each ticket can have.
Draws (All draws are provably fair):
One and half hour before the time of the draw, a file will be generated containing all the tickets that will participate in the draw. We will timestamp the SHA256 file hash with a bitcoin transaction.
At the time of the draw, we will check the current bitcoin block number and the next block will be used to generate the winning numbers;
The seeds that will be used to generate the winning numbers are: the block hash (lower case), the block height, the server secret and the SHA256 hash (upper case) of the file with the participating tickets;
The winning numbers will only be published after the chosen block having 6 confirmations.