Seed commitment
Awaiting seed data
Add the original hash to compare it with the revealed seed.
Hold the casino accountable.
Independent Provably Fair Checker
Use this free calculator to check your Stake Originals bet from its revealed seeds and compare the result, with no sign-up.
Your bet details
Use the details from your bet history.
Import a link or saved proof
The link is read locally, without opening the casino.
The imported details stay in your browser.
Use a local demo session
Copies the local client seed and nonce. An active, unrevealed server seed is not filled in.
Active local seed hashNot loaded
Your result
Compare this with your bet history.
See how your bet played out
Choose your game and add the revealed seed details to see its result here.
Ready when you are
Enter the details from a settled bet. Your result updates automatically.
Stats for nerds
Seed checks, reference evidence, and the full calculation.
Reproduction
Not calculated
The selected game model will calculate the outcome.
Reference comparison
Nothing to compare
A calculation alone does not confirm a recorded casino result.
Calculation summary
Reference checks
Choose a game to view its evidence.
Coverage varies by game and model version. A matching reference case supports that case, not every possible outcome.
View reference cases
The calculation, step by step
Seeds to bytesHMAC messages and generated bytes
Calculate a result to inspect its byte stream.
Bytes to numbersConversion steps and event values
Each supported model translates the byte stream into game events.
Verifier JSONInputs, calculated result and model details
Enter seed data and calculate a game event.
How HMAC bytes become game results
For the standard HMAC stream, the message is clientSeed:nonce:round. Each SHA-256 HMAC produces 32 bytes. Four bytes form a float using b0/256 + b1/256^2 + b2/256^3 + b3/256^4. Some games use different inputs or mappings; the calculation details show which model applies.
What is provably fair?
A provably fair game gives you a way to check how a result was produced. Once the casino reveals the server seed, you can repeat the calculation using the same inputs.
This checker shows the result for supported Stake Originals games. If you saved the seed hash before playing, you can also check that it matches the revealed seed.
How to check a bet
Open the bet's fairness details at the casino. Copy the revealed server seed, client seed, and nonce, then choose the same game settings here.
The result updates automatically as you change the details. Compare it with your bet. For Crash or Slide, choose the hash-based option and enter the round hash and public seed.
Use Stats for nerds to inspect the seed checks, reference comparisons, and calculation details.
An independent check, with clear limits
A matching calculation supports that result. It does not audit a casino, verify its advertised return to player (RTP), or guarantee future results or withdrawals. Some game models have known limits; these appear in Stats for nerds.
Mr BTC Gambler maintains this checker independently. Calculations run in your browser. This site earns casino affiliate commission.
Common questions
What does a provably fair calculator check?
It repeats the game calculation using the revealed seed details for a settled bet. If you saved the original server seed hash, it also checks that the revealed seed matches it. Crash and Slide use a round hash and public seed.
Can a provably fair checker predict the next result?
No. The active server seed remains hidden while bets are being placed. A provably fair checker uses the seed revealed afterwards to check past results. It cannot predict the next result or guarantee a win.
Where do I find the revealed server seed?
Look in the casino's fairness settings after rotating the seed. Copy the seed revealed for the bet you want to check. You do not need to provide your password or obtain an active, hidden server seed.
Why does my result look different?
Check the seed pair, nonce, game settings, and any actions you took during the bet. A different game model or action history can change the result. A mismatch is a reason to investigate; it does not by itself prove that a game was rigged.
Does a matching result prove that the casino is fair?
A match supports that result under the selected game model. It does not audit the casino, verify advertised RTP, or guarantee withdrawals or future results. Stats for nerds shows the checks, reference evidence, and known limits.
Are my seeds sent to the casino?
The calculation runs in your browser. Importing a calculator link reads its values without contacting the casino. Use the revealed seed from a settled bet.
Supported Stake Originals
The game menu also includes slots such as Tome of Life, Scarab Spin, and Blue Samurai. Each game's reference checks and model limits are available in Stats for nerds.