What Is Provably Fair Gaming?

Provably fair gaming is a cryptographic verification system that lets players independently confirm that every bet outcome was determined before the wager was placed, eliminating the possibility of casino manipulation. At Growl Games, all original games including Crash, HashDice, Mines, and Plinko use SHA-256 hashing — the same cryptographic standard that secures Bitcoin. Before each round, the server generates a random seed, hashes it with SHA-256, and shows the hash to the player. After the round, the original unhashed seed is revealed so players can verify the result matches the pre-committed hash. This makes it mathematically impossible for the casino to change outcomes after bets are placed. Unlike traditional online casinos that require blind trust, provably fair technology gives players full transparency and cryptographic proof of game integrity.

How Do I Verify a Bet?

1. Before the round, copy the hashed server seed shown by the game.
2. Set or note your client seed (you can change it at any time).
3. Play the round; the outcome is generated from the combined seeds.
4. After the round, the casino reveals the original server seed.
5. Hash the revealed seed with SHA-256 and confirm it matches the earlier hash.

Which Games Are Provably Fair?

All Growl Games originals are provably fair, including Crash, HashDice, Mines, and Plinko. Third-party slots and live casino games use certified RNG systems from licensed providers.

A Worked Verification Example

Suppose before a Dice roll the game shows the server-seed hash a1b2c3…. You set your client seed to myseed123 and roll. After the round, the game reveals the server seed 7f9e04…. To verify: (1) run SHA-256 over 7f9e04… — any online SHA-256 tool or one line of Python works — and confirm the output equals the pre-shown hash a1b2c3…; (2) recompute the roll from the combined server seed, client seed, and nonce using the published formula, and confirm it matches the result you saw. If the hash matches, the server seed — and therefore your outcome — existed before you bet and was never changed.

Why Does the Client Seed Matter?

The outcome is derived from the server seed and your client seed together. Because you can set the client seed to anything at any time, the casino cannot precompute favourable outcomes: it committed to its seed before knowing yours. Changing the client seed before a session is a simple way to guarantee the operator could not have predicted your results.

Provably Fair vs Certified RNG: What Is the Difference?

Certified RNG (used by licensed slot and live-casino providers) means an independent testing lab has audited the random number generator. Provably fair goes further for originals: it lets every individual player verify every individual outcome with mathematics alone — no lab, licence, or trust required. Growl Games uses both: SHA-256 provable fairness for originals and certified providers for third-party games.