Blackjack (legacy)
Verify any BC.Game legacy Blackjack hand. 52 independent HMAC calls (`${client}:${i}` for i=0..51) → per-card `slideWindowNumber(hash, 52)` index from the deck. Legacy variant — no nonce.
Frequently asked
Is BC.Game Blackjack (legacy) really provably fair?⌄
Yes. BC.Game publishes a cryptographic commitment (the hash of the server seed) for each round BEFORE you bet. Afterwards the server seed is revealed and anyone can recompute the outcome — which is exactly what the verifier above does. If the computed result matches the shown one, the round wasn't manipulated.
How do I verify a BC.Game Blackjack (legacy) round?⌄
Paste the revealed server seed, your client seed into the form above. The verifier re-runs the official math and shows you the exact result, step by step. Everything runs in your browser — your seeds never leave the device.
Where do I find my BC.Game seeds?⌄
On your BC.Game account's fairness / seed page. There you can rotate the server seed: rotating reveals the old one (so you can verify all your previous bets) and commits a fresh hash for the next ones.
Can BC.Game cheat on BC.Game Blackjack (legacy)?⌄
Not without getting caught. The server-seed hash is published before the bet, so BC.Game can't change the seed after the fact — any change would produce a different hash than the committed one. That's what makes the game verifiable.