{
  "chain": "x402-spend-evidence",
  "question": "An x402 payment authorization arrives with a signature that verifies. Before we ship the goods, has this authorization nonce already been spent?",
  "look_at": "art-592-x402-domain-nonce-window-checker.verdict",
  "try_changing": {
    "step": "art-592-x402-domain-nonce-window-checker",
    "field": "nonce_already_used",
    "value": true
  }
}