Provably Fair Verification

Verify any RBXChance coinflip instantly. Paste the seeds that were revealed after the game and we will reproduce the outcome using the exact algorithm that powers the live platform.

Validate a Coinflip

Enter the server seed hash, player seed, and wager values. Everything is calculated locally in your browser using SHA-256 hashing.

How Coinflip Validation Works

  1. Server Seed Hash: We publish a SHA-256 hash of the server seed before the game starts.
  2. Player Random Seed: The creator’s client generates a random seed that is sent to the server.
  3. SHA-256 Hashing: After the game finishes, we combine both seeds and hash them again to produce a roll.
  4. Weighted Odds: The roll is compared against the wager distribution to determine the winner.

Need the Game Seeds?

Every completed RBXChance game displays its provably fair metadata:

  • The server seed hash appears in the fairness modal before the coinflip begins.
  • The server reveals the unhashed seed as soon as the game completes.
  • Your browser stores the client seed that was used for the roll.
  • Paste those values here to independently verify the outcome.