Any bet you have placed can be recomputed here from the three values that produced it. Pick the game, paste the server seed, client seed and nonce, and the form derives the outcome the same way the casino did. If the result matches the bet in your history, that bet was settled against a seed committed before you played.

You do not have to copy anything by hand. Open a bet in your history and use Verify Bet: it opens this page with the seeds and nonce already filled in.

The server seed is only shown hashed while it is in use, which is what stops anyone, including us, from knowing an outcome in advance. To reveal the unhashed seed for bets you have already placed, change your client seed. That retires the old server seed, publishes it, and issues a new hashed one for the bets that follow.