{
  "manageEntity": {
    "action": "Save",
    "entityId": "1646388177",
    "entityType": "Track",
    "nonce": "0x8172b301ac1223670df2a561566a35e42812ec8bd0608d528814b18b007b5642",
    "signature": "0x0b9205e3df86bc1c3da0480e8dfde45303b021d1f555a66d5799f017715818ee17eeab2b86f7b7749cb711e641f8216b8a96ecd3eabd85582dd0f324c54498781b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}