Provably fair gaming uses cryptographic seeds to prove that a game result was decided before you played, and that neither side changed it mid-round.

The three pieces are the server seed, the client seed, and the nonce. The server seed is hashed before play so the casino cannot alter it later without detection.

Verification means taking the revealed server seed after the round, combining it with your client seed and nonce, and confirming the result matches what the game showed.

Most casinos include a built-in verifier, but independent third-party verifiers let you check the same result without relying on the casino own tool.