Provably Fair allows you to verify that the result of each game was randomly generated. Since you may be playing from this wallet for the first time, you can request the initial hashed seed ahead of time. After this, it will be done automatically for each play.

A result is calculated by combining the rng_seed provided by Gamba, the client_seed provided by the players client, a nonce, which increments by 1 for each play and a bet.

Provably Fair allows you to verify that the result of each game was randomly generated. The rng_seed will be done automatically for each play. Your client_seed will affect the result of the next game you play.