{
  "manageEntity": {
    "action": "Download",
    "entityId": "1865900666",
    "entityType": "Track",
    "metadata": "{\"cid\":\"\",\"data\":{\"city\":\"Taichung\",\"region\":\"Taichung City\",\"country\":\"Taiwan\"}}",
    "nonce": "0x590f2aa3ad82284338cca7a14a6056440e00714190ebe53e7f94f8bd17c907a8",
    "signature": "0x0f3801b113078a37a4453bb037a448b4eeebcded28f5e9c80c65c296fb39276d146662d9ffcf30c2c680e55d0e06bf0800c792f4dd6194527dd67b697477f20f1b",
    "signer": "0x53E627C5A7Cbf16CBD615c9C7553EAe5c91f16e9",
    "userId": "213575596"
  }
}