Check the draw yourself
You don't have to take anyone's word for who won. Here is the whole method, and a button that re-runs it inside your own browser using nothing but the public numbers.
How it works
- Before a single square sells, the app rolls a secret 32-byte key and publishes a fingerprint of it - a SHA-256 hash. The key itself stays sealed.
- Squares sell in the open. Anyone can see which numbers are paid for at any moment.
- At draw time the app hashes the key together with the board name and the exact list of paid numbers. That hash is turned into a number, divided by the size of the list, and the remainder points at the winning square.
- The key is then published. Hash it - it has to match the fingerprint from step 1. Re-run step 3 - it has to land on the same square.
Changing the key breaks the fingerprint. Changing the list of entrants changes the hash. Both were locked before the key was ever revealed, so there is no room to steer the result.
This board
Not drawn yet
The key stays sealed until the draw. What you can check right now is that the fingerprint below was published when the board opened - screenshot it if you like. After the draw, come back and the key will be here to check against it.
Check it by hand
Paste any published draw - from this board or one from months ago - and the maths runs locally in your browser. Nothing is sent anywhere.
Read the code
The draw is one small file, and it is the same file on the server and in this page. Nothing is hidden behind a build step.