Provably Fair Verification

Verify any RBXChance coinflip instantly.

Validate a Coinflip

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

How Coinflip Validation Works

  1. Hash Generation: We combine server_seed:client_seed:nonce and hash it using SHA-256.
  2. Random Number: We take the first 13 characters of the hash, convert to an integer, and divide by 2^52 to get a float between 0 and 1.
  3. Weighted Odds: The random float is compared against the creator's odds (Creator Value / Total Value).
  4. Winner Determination: If Random Float < Creator Odds, the Creator wins. Otherwise, the Joiner wins.

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.