Blackjack

Provably fair

Verify fairness

The session's seed decides every card. Its hash was committed before the first hand; the seed is revealed when the session ends. Each round's cards come from HMAC-SHA256 keyed by the seed over the round's number and the bettor's own seed.

Seed hash

0fb1b1afc5df452413749f9982a94ce541827b04e9c387e72356b75284592435

Seed

6ab22d513ef82cfc3c2a0b454ffcc898d43242a28f7e315d85fbc391063b74f3 SHA-256 of "degen.match.seed.v1", a zero byte and the 32 seed bytes is the seed hash.

Bettor's seed

ed4cfc59c78be4b0f6bb651af44b388a

Commitment

Batch 62,676, Merkle root 4535e85b99969fa701d2707a888e372f87c3d5b543c5ac24543922e1a44470f9. Recorded by Degen Protocol, not on a chain. See this batch and its Merkle tree

Merkle path

1. bda82ee73d25b6423f0f541c8c626122019e649089432a1cffd8e77a7378244c
2. cb6aa438e5881b3d8859f1bdb5734bb94e565a5f35ba175b5a39f371882bfdee

Checked: the seed hash proves into the root.

To check it yourself, take the session's proof:

1. Hash the seed as above and compare it with the seed hash; prove the seed hash into the root with the Merkle path (keccak256, as for every match).
2. For each round: round seed = HMAC-SHA256(key = seed, "degen.house.round.v1" ‖ 0x00 ‖ u64be(length of the bettor's seed) ‖ bettor's seed ‖ u64be(round)).
3. Key ChaCha20 (RFC 8439, zero nonce) with the round seed and read little-endian 64-bit words; a card is the next word below 2⁶⁴ − 1 − ((2⁶⁴ − 1) mod 52), modulo 52.
4. Replay the round's actions with the game's rules: the cards and the payout must match.

The replay plays every hand rebuilt this way on the server from the same data, and marks any that does not rebuild as recorded.