{
  "manageEntity": {
    "action": "Save",
    "entityId": "598596",
    "entityType": "Track",
    "nonce": "0x7edd3246c46a3034505f647af8eb5fce94bdc91ba213bad32281d61724c53970",
    "signature": "0x45c5e494f66b68cc91d64580fb7963e49cbb26b864a11fff91fd0e472a4a5758408967cbbefd1e34177369b7def373994f09e4335c8f711f7a1c7f1daae2e6391c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}