Provably fair

Server seeds, client seeds, hash chains and public randomness: how a provably fair bet is made and checked.

Provably fair18 October 20265 min read

Drand explained: public randomness for multiplayer casino games

What the drand beacon and the League of Entropy are, how threshold signatures make a random value nobody knows early, and how a hash chain uses it.

Provably fair18 October 20264 min read

A worked check of one dice bet with real numbers: compare the seed with its SHA-256 commitment, recompute the HMAC and turn bytes into a roll.

Provably fair18 October 20265 min read

How a provably fair game locks in a hidden server seed, mixes in your client seed and a nonce, and what the check does and doesn't prove.