1. Before each game session, the server generates a random server_seed and shows you its SHA-256 hash.
2. You can set your own client_seed at any time.
3. Each bet uses: HMAC-SHA256(server_seed, client_seed:nonce)
4. The first 8 hex characters are converted to a number, then mod 10000 / 100 gives the result (0.00-99.99).
5. When you rotate seeds, the previous server seed is revealed so you can verify all past bets.
House edge: 1%