Those asking "Why would a casino call me?" can check the answer on their own, round by round. Provably fair games let a player confirm that a result was fixed before the bet and stayed untouched afterwards, using nothing but a published hash and a short calculation. The casino commits to its part of the result in advance, the player adds a part of their own, and the two combine into the outcome. Anyone can repeat the calculation once the round is over.
The client seed is the player's contribution, a value set by the browser or typed in by hand, and changing it at any time is part of the design. A counter called the nonce rises by one with every bet made under the same pair of seeds, so each round gets a fresh input. Because the player controls the client seed, the casino cannot pick a server seed that favours the house for a value it does not know.
Before any bet, the casino generates a secret value called the server seed and shows only its hash, a fingerprint that cannot be reversed into the seed itself. Publishing the hash first locks the casino in: any later change to the seed would produce a different fingerprint. The seed stays hidden while it is in use, because knowing it would let a player predict every result. Once it is retired, the casino reveals it so it can be checked.
The server seed, client seed and nonce combine into a new hash, and a published formula turns part of it into a dice roll, card or multiplier.
Yes. Rotating ends the current pair, reveals the old server seed for checking and starts a fresh hashed seed for the next rounds.
The player's own contribution, set by the browser or typed in by hand, which can be changed at any time so the casino cannot predict it.
Publishing the hash first locks the casino in, since any later change to the hidden seed would produce a different fingerprint.
No. It only proves a result was not altered after the bet; the edge built into the payouts is published separately and varies by game.