Make Onyx sign a lie and the pot is yours. It's Ed25519 — you can't. Every attack is signed and rejected, forever.
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The rule: submit a verdict that verifies under Onyx's public key but states a falsehood. The win-check is pure Ed25519 — no AI to talk around (the Freysa lesson). Forging the signature is the only way in, and it's computationally infeasible.