{
  "manageEntity": {
    "action": "Save",
    "entityId": "664017428",
    "entityType": "Track",
    "nonce": "0x3ba1038c1e841e4cab3ecd3d320ca1887180ad1fd9edefdf1fae8a85c66bfbb4",
    "signature": "0xcc7c54f263c047a855592afe83681bd0f9e13b935c582db5c7c1ebf039568b9d45dabfbde1a1a447fe353db04f0c51ba9d8049ea5600bab9247916e3c9f455f71b",
    "signer": "0x37C656432bDD87630C13F60036e9857B5ee36154",
    "userId": "288167767"
  }
}