{
  "manageEntity": {
    "action": "Download",
    "entityId": "856246497",
    "entityType": "Track",
    "metadata": "{\"cid\":\"\",\"data\":{\"city\":\"Tokyo\",\"region\":\"Tokyo\",\"country\":\"Japan\"}}",
    "nonce": "0xd0e1ec2722f22a55fde630b549a94b3a7c4cfc4a7278ff246a2c6fa8bca5ea30",
    "signature": "0x3295c04733ba8b02fe13360e6f66ac4377750ad1823f10015bb617c269c1466946adfd22c59342f185943796af0bb456401094a822803b90d823127ee8c42e361c",
    "signer": "0x5002257407a5F4E33FdB8B38746fFB3Bd73C98E1",
    "userId": "370910"
  }
}