Verify any Roobet Roulette round. The outcome is HMAC-SHA256(rouletteHash, ETH-block-salt) reduced to one of {14× Green, 7× Bait, 2× Red, 2× Black}. The ETH block hash is the trust anchor — Roobet commits to it before the session starts. See the previous 100 rounds of the session in one go.
