Every random event — dice roll, card shuffle, RPS choice, domino placement — is committed to a SHA-256 or SHA-512 hash before the event happens. After the event, the seed is revealed. Anyone can hash the revealed seed and confirm it matches the original commit, then re-derive the outcome. The whole match is reproducible from the transcript.
Provably fair is a cryptographic protocol where the operator commits to a random seed before a game and reveals it after, so players can mathematically verify the result was not manipulated. 6proclub uses SHA-512 for backgammon and SHA-256 for the other games.
No — the commit hash is published before the game starts. If the operator changed the seed afterward, the revealed seed would not hash to the published commit, and any third party with the transcript could prove the cheat. There is no path through the protocol that produces a manipulated result without leaving evidence.
No — 6proclub is a peer-play platform. Players play each other. The platform takes a small fee on money games (typically 5%), but there is no house edge that affects game outcomes. Skill determines results.