Provably fair seed management. Each player has a seed pair per operator with a lifecycle: upcoming → active → retired. Pairs are auto-created on first bet.

• Active: serverHash + clientSeed + nonce (increments per round)
• Upcoming: pre-generated, only serverHash visible
• Retired: serverSeed revealed for verification

For the full commit-reveal scheme, rotation flow, and verification steps, see the Provably Fair Guide.