Runs entirely in your browser (WebCrypto) — no server involved. roll = HMAC-SHA256(serverSeed, clientSeed + ":" + nonce) → first 4-byte chunk under 4,294,960,000, mod 10,000. Same check in Python: hmac.new(serverSeed, msg, sha256).
roll = HMAC-SHA256(serverSeed, clientSeed + ":" + nonce)
hmac.new(serverSeed, msg, sha256)
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