{
  "manageEntity": {
    "action": "Download",
    "entityId": "198228098",
    "entityType": "Track",
    "metadata": "{\"cid\":\"\",\"data\":{\"city\":\"Tokyo\",\"region\":\"Tokyo\",\"country\":\"Japan\"}}",
    "nonce": "0xdc9c6aa3029bcc6544d880379fbc536987d558a42cf8d8afed5b6636bf57b5ed",
    "signature": "0xbd26a6d090badaba3a55f1af16e057d618322dc6d459cf1cc9c23130749188dc13c4ff23897e0e26f95c6e49d29ff9d43bc7d7e050f5373ed2a67644949cabd01c",
    "signer": "0x5002257407a5F4E33FdB8B38746fFB3Bd73C98E1",
    "userId": "370910"
  }
}