{
  "manageEntity": {
    "action": "Save",
    "entityId": "256893585",
    "entityType": "Track",
    "nonce": "0x90602a8b2be16cc5c9228787cc39ce8724641efd16d165794a0df9f9e33cc12a",
    "signature": "0x2ea3d7b93d36831b92c54e8f912fd3c3bfa65950c939a53184f932420a62782f0add0af79d356a2acd9d043b372d3debadb537e280c063e49c8b3cace99c7efd1c",
    "signer": "0xbd18A0CEDC52343842f076A474bA46656B93A232",
    "userId": "194819663"
  }
}