Provably fair crash game
Every crash round on Aurion is provably fair: the crash point is fixed before the round starts, and once it ends you can check it yourself, in your own browser. The games are free with virtual coins. No real money, no deposit.
How the crash point is decided
- Before each round we pick a fresh random server seed and publish only its SHA-256 hash, together with the round's public client seed and round number (the nonce). The hash commits us to that seed without revealing it.
- The crash point comes from HMAC-SHA256(server seed, "client seed:nonce"). We read the first 52 bits of that hash as a number h.
- If h is divisible by 33, the round busts instantly at 1.00×. That happens about once in 33 rounds and is where the house edge comes from: about 3%, so roughly 97% RTP. Otherwise the crash point is ⌊(100·2⁵² − h) / (2⁵² − h)⌋ / 100, capped at 1,000×.
- When the round ends we reveal the server seed. Hash it and compare with the commitment, then recompute the crash point. Both must match what you saw.
Verify a round
Pick a recent round below, or paste a round ID, and press Verify. Everything is computed in your browser.
Play it free
These games all use the same crash scheme, so any of their rounds can be checked here.
Questions
- Is the crash game rigged?
- No. The crash point is fixed by a seed we commit to before anyone bets, so we can't change it once you see the round. After the round you can recompute it from the revealed seed and confirm it matches.
- How do I verify a crash round?
- Choose a recent round on this page, or paste its round ID, and press Verify. The page fetches the revealed server seed, checks its SHA-256 against the published hash, and recomputes the crash point in your browser.
- What is the house edge in crash?
- About 3%. Roughly one round in 33 busts instantly at 1.00×, which gives a return to player of about 97%. You play with virtual coins, so the edge only affects how fast coins come and go.
- Why can't I see the server seed before the round?
- If you could, you would know the crash point in advance. Publishing the hash first proves the seed was chosen before the round without giving the result away; the seed itself is revealed when the round ends.
- Is this crash game free?
- Yes. Aurion is a social casino: you play with free virtual coins, there is nothing to deposit and nothing to withdraw.