Provably Fair Explained - What Does Provably Fair in iGaming Mean?

by Simona Ilioska,July 25, 2025

8 min read

Key Takeaways

Provably fair is a system that allows players to verify how a game result was generated, using transparent data and a publicly available algorithm.
The outcome of each round is created from three values: a client seed (user input), a server seed (casino input), and a nonce (round counter).
The server seed is displayed as a hash before the game and fully revealed after the round, allowing players to confirm it hasn’t been changed.
Players can set or rotate their own client seed, adding a layer of independence to the calculation of results.
Unlike traditional RNG systems, provably fair models allow players to check the logic behind each result, not just the result itself
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Every time you play a casino game online, there’s an outcome- a card drawn, a number landed, a multiplier stopped. But how is that outcome decided? And how can you verify the game result to ensure it's truly fair?

That’s where provably fair algorithms come in.

Rather than asking you to trust the casino blindly, provably fair systems show you the exact cryptographic process behind the outcome. It’s also built into how we operate at Jackpot.bet.

Let’s look at how this system works, how it stacks up against older methods like RNG, and how you can verify your own game results step by step.

What Does Provably Fair Mean?

Provably fair is a system used in online gaming to guarantee that every game round is truly random and transparent.

It relies on cryptographic methods, often supported by blockchain technology, to give players a way to verify results for themselves.

Rather than trusting the casino to be fair, you can check the outcome of each spin or hand and see proof that it wasn’t altered or manipulated.

It’s a simple way to make sure the game played out exactly as it should, with no influence from either side.

How Provably Fair Works

The system combines three key components: a value provided by you (client seed), a hidden value from the casino (server seed), and a tracker that updates every time you play (nonce).

These pieces come together in a way that ensures every round is both unpredictable and provable, allowing you to verify the results for yourself after the outcome is revealed.

Client Seed

The client seed is your personal input it’s like a player’s fingerprint in the fairness process. You can let your device generate it automatically, or manually set your own seed for added independence. This ensures the casino cannot fully control the randomness, a key principle in fairness in online games.

Server Seed

The server seed is the casino’s contribution to the outcome. It's a secret value that's generated before the round begins. However, to prove that it was pre-set and never altered, the casino displays a hash of the server seed before you play, a scrambled version of the seed created using the SHA-256 hashing method.

Analogy: This hash acts like a sealed envelope. You can’t read what’s inside yet, but you know it can’t be changed without tearing it open. After the round ends, the casino reveals the full server seed. You can verify it against the original hash to ensure they match.

Nonce

The nonce (short for “number used once”) is a counter. It starts at zero and increases by one every time you play a round with the same client/server seed pair.Its job is to ensure that even if the seeds remain the same, the result changes for every round.

How It All Comes Together

Here’s what happens behind the scenes during a provably fair game:

The casino generates a server seed, hashes it using SHA-256, and displays the hash.
You use a client seed, which can be either generated automatically or set manually.
A nonce (starting from 0) is included to track the number of rounds.
These three values are processed through a public, open-source provably fair algorithm to determine the result.
Once the round ends, we reveal the full server seed used in the calculation.
You can then verify the game outcome by re-running the same process using the public algorithm and the disclosed values.

Provably Fair vs RNG

Many online casino games today stll use a Random Number Generator (RNG). While RNGs do create random results, they operate entirely behind the scenes.

Players are shown the final outcome, but never how it was calculated.

With provably fair systems, that changes completely. Instead of asking you to trust that the result was fair, the game provides you with the data used to produce it- and the tools to check it yourself. It's a shift from “take our word for it” to “see for yourself.”

Here’s how provably fair compares to traditional RNG systems:

Key Factor	Traditional RNG Games	Provably Fair Games
Result Generation	Hidden behind closed code	Based on player-accessible values
Before the Round	No way to preview or verify future outcomes	The server seed hash is shown upfront to lock in values
After the Round	No data provided - result appears, and that’s it	The server seed is revealed; the full round can be rechecked
Player Involvement	None - the platform controls 100% of the outcome	Players provide a client seed that contributes to the result
Tamper Protection	Claims of fairness rely on internal systems or audits	Every value can be proven to match exactly, or exposed if not
Can You Check the Logic?	No	Yes
Control Over Randomness	No	Partial - your client seed makes you part of the process

How to Verify Provably Fair Game Results at Jackpot.bet

One of the biggest advantages of provably fair gaming is that you can check the result of every round yourself. At Jackpot.bet, this feature is available in all our Original games and is built right into the game interface.

The process is simple and doesn’t require any advanced knowledge. Here’s how it works:

Step 1: Open the Fairness Panel

During any of our Original games, click the Fairness icon in the bottom-right corner. This opens a two-tab menu with all the information used to generate your round: Seeds and Verify.

Step 2: Understand the Seeds Tab

The Seeds tab shows the values involved in calculating your result:

Active Client Seed – Your personal seed, generated automatically or set manually.
Active Server Seed (Hashed) – The hashed version of the server’s seed, shown before the round.
Nonce – A counter that tracks how many rounds you’ve played with the current seed pair.
New Client Seed – A field to change your seed for future rounds.
Next Server Seed (Hashed) – The hash of the upcoming server seed, locked in advance.

These values can be copied with one click, making it easy to store or use them for external verification later.

Step 3: Use the Verify Tab

Once a round ends, switch to the Verify tab. Here you’ll be prompted to enter the following:

Game – Choose the specific game (e.g., Limbo)
Client Seed – Paste or use your known client seed
Server Seed – The full server seed (now revealed after the round)
Nonce – Enter the correct nonce value (from the Seeds tab)

After filling in all fields, the system will recalculate the game result using the same formula the server used. If your inputs match what was used in the original round, the result will match exactly.

Step 4: Review the Result or Recheck Any Round

This system lets you verify:

The server seed wasn’t changed after the result.
That your input was actually used.

If you save your seed values and nonce history, you can also manually verify any past round using Jackpot.bet’s built-in verifier or any public provably fair calculator tool.

Conclusion

Provably fair systems give you a way to double-check that every result is legit.

On all Jackpot.bet Originals, you’ll find a Fairness panel that shows the key data: your seed, the server seed, and the nonce.

The server seed is locked in before the round starts and revealed afterward, so you can confirm nothing was changed behind the scenes.

Make sure you always play at online casinos that prioritize total transparency and fairness.

Frequently Asked Questions

Can players influence the outcome using the client seed?

No. The client seed adds a layer of randomness, but it cannot be used to control or predict outcomes. It is combined with the server seed and nonce to produce a result using a fixed algorithm.

Is changing the client seed necessary or recommended?

You can change the client seed at any time, especially if you want a fresh input for future rounds. While not required, manually setting your client seed can enhance transparency and give you full control over your part of the input. Jackpot Originals allow you to edit it directly within the Fairness panel.

What happens if I use the same client seed in multiple rounds?

Even if the client and server seeds remain the same, the nonce, which increases with every round, ensures the output stays unique. This prevents the system from producing the same result repeatedly and is a core part of how provably fair maintains randomness.