FAIRNESS FILE
Nobody should know first.
SCRATCHIES plans a dual-commit reveal: operator seed-chain material XOR a future chain blockhash, committed when scratching starts. This is a design claim, not deployed proof.
Planned invariant
Before scratch initiation, a sealed ticket carries no determined outcome. After initiation, transfer locks while the settlement input matures. Neither holder nor operator should be able to selectively reveal only winners.
Publication standard
- Exact verifier source and deterministic test vector.
- Seed commitment, target block, inputs, output, and receipt.
- Failure and expiry handling visible before paid play.
- Verified contract source and admin-power disclosure.