Provably Fair, Explained: Verify Any Fasol.fun Result

Most online games ask you to trust that their results aren't rigged. "Provably fair" flips that: instead of trusting, you verify. On Fasol.fun every Crash, Coinflip and Jackpot result can be checked by you, mathematically, after the round. Here's what that actually means — in plain language.

The problem provably-fair solves

On a typical platform, the operator generates the result on a private server. You have no way to know whether the outcome was decided before or after your round, or whether the odds were quietly tilted. You're trusting a black box.

Provably-fair removes the black box. The result is locked in before your round, in a way that can't be changed afterwards but also can't be read in advance — and then revealed so you can confirm it.

How it works (the commit-reveal idea)

Two ingredients combine to produce every result:

1. A server seed — a secret value the game generates before the round. Crucially, you're shown a hash (a cryptographic fingerprint) of it up front. A hash is one-way: it proves the seed exists and is fixed, without revealing what it is.
2. Public data you influence / can't be faked — your input and on-chain Solana data that nobody controls.

Because the server seed is committed (as its hash) before the round closes, the operator can't change the outcome after seeing your play. And because the seed itself stays hidden until after the round, you can't predict the result either. After the round, the seed is revealed — and you can re-combine it with the public data to confirm the result matches the hash you were shown. If it matches, the round was fair. If anyone had tampered, the hash wouldn't line up.

That's the whole trick: commit first, reveal after, verify yourself.

How to verify on Fasol.fun

1. Play a round of Crash, Coinflip or Jackpot.
2. After it settles, open the Provably Fair page — it shows the committed hash, the revealed seed, and the inputs.
3. Re-compute the result and check it against the hash. It matches → provably fair.
4. Because payouts are on-chain, you can also look up the transaction on any Solana explorer.

You don't need to be a cryptographer — the verify tool does the math; the point is that you can, independently, any time.

Fair odds, not just fair results

Provably-fair guarantees a result wasn't rigged — but Fasol.fun goes further on the odds themselves: games run at 100% RTP — the odds aren't tilted. A 50/50 coinflip is genuinely 50/50; Crash multipliers aren't shaded against you. Instead of a hidden cut, Fasol charges a flat, transparent 2% transaction fee — a commission you can see, not a number hidden inside the odds.

That combination — verifiable results and untilted odds — is rare. It's the core reason Fasol.fun is built on-chain.

FAQ

What does provably fair mean? That you can mathematically verify a game result was fair after the round, instead of trusting the operator. The result is committed (as a hash) before your round and revealed afterward so you can re-check it.

How do I verify a Fasol.fun result? Open the Provably Fair page after a round — it shows the committed hash, revealed seed and inputs so you can re-compute and confirm. Payouts are also on-chain on Solana.

Can Fasol.fun change the outcome after my round starts? No. The result is locked in (committed as a hash) before the round closes — changing it would break the hash check.

Does provably fair mean I'll win? No. It means the game is honest and the odds aren't tilted (100% RTP, fair odds — just a flat 2% fee). Outcomes are still chance. Play responsibly.

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See it for yourself: play Crash, Coinflip or Jackpot, then verify on the Provably Fair page.