How Provably Fair Gambling Works — A Complete Guide
Learn how provably fair technology uses cryptographic algorithms to let you verify every game result. Understand seeds, hashes, and verification.
What Is Provably Fair Gambling?
Provably fair is a technology that uses cryptographic algorithms to prove that game outcomes have not been manipulated. It is one of the biggest advantages of blockchain-based casinos over traditional online gambling.
How It Works
The system uses three key components:
- Server Seed — A random value generated by the casino before each bet
- Client Seed — A random value you provide (or is generated for you)
- Nonce — A counter that increments with each bet
These three values are combined using a cryptographic hash function (usually SHA-256) to determine the game result.
Step-by-Step Verification
- Before you bet, the casino generates a server seed and shows you its hash (encrypted version)
- You place your bet with your client seed
- The game result is calculated from both seeds
- After the bet, you can see the unhashed server seed
- You can independently verify that the hash matches, proving the result was not changed
Why It Matters
Traditional online casinos ask you to trust that their random number generators (RNGs) are fair. Provably fair technology removes this trust requirement — you can mathematically verify every single result.
Which Casinos Offer Provably Fair Games?
- BC.Game — All BC Originals use provably fair with audited RNG
- Stake — Stake Originals use provably fair algorithms
- Shuffle — All Shuffle Originals are provably fair
- Thrill — Thrill Originals with verifiable outcomes
- Cloudbet — Arcade games use provably fair verification
Verification Tools
Most provably fair casinos provide built-in verification tools. You can also use third-party verification sites to independently check results. Simply enter the server seed, client seed, and nonce to recalculate the result.
What About Non-Original Games?
Third-party games from providers like Pragmatic Play, Evolution, and Play'n GO use certified RNGs instead of provably fair systems. These are audited by independent testing labs like iTech Labs, GLI, and BMM Testlabs. While not blockchain-verifiable, they meet regulatory standards for fairness.