Provably fair

Three values are combined to determine every bet:

• Server seed — a random 32-byte value generated by the server. Kept secret while active.
• Server seed hash — SHA-256 of the server seed. Shown to you before any bet is placed. This is the commitment.
• Client seed — set by you. Defaults to a random value but you can change it any time.
• Nonce — increments by one for every bet you place.

Each bet computes:

bytes = HMAC-SHA256(serverSeed, clientSeed + ":" + nonce)
roll  = first 4 bytes as uint32 / 2^32     →   float in [0, 1)

Each game then maps this float to its specific outcome (red/blue for coin flip, 0.00–99.99 for dice, multiplier ladder for limbo).

1. Rotate your seed in the game's Provably fair panel.
2. The current server seed is disclosed to you. SHA-256 it and confirm it matches the hash you saw before the bet.
3. Recompute the HMAC for any past bet using the disclosed seed, your client seed, and the nonce of that bet.
4. The first 4 bytes of the result, mapped through the game's formula, will exactly match the recorded outcome.

Provably fair does not mean zero house edge — the casino still profits long-term via the multiplier formula. Every game's edge is published on its tile (most run 1%). What "provably fair" guarantees is that the outcome was not manipulated after you bet.