{
  "manageEntity": {
    "action": "Save",
    "entityId": "1535806587",
    "entityType": "Track",
    "nonce": "0x578a36e096f7ad5c3ad14c16a87def94550ddb5de4179a5c01661a9039b04f35",
    "signature": "0xa6e13fce236ced189735835c476cddf94e49b5cae51618bc72298fce5a1283f079ce74e2f93042cb06dede2792d192228ffe5d5835b81d536e48430a12ad87221c",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}