{
  "manageEntity": {
    "action": "Save",
    "entityId": "194238961",
    "entityType": "Track",
    "nonce": "0x42d2adce53076f62243501536dcd0f5c1f22a1c6c6a7337e2504b1e41e97be4b",
    "signature": "0xf78491da5aa03920306a04e13eea95c891930c0510865138b9c510a6d3e25a43290562f85dd9244ec1ec0c1a1d1f63124960925f8a03f7a9dc77c0d8d5e793411b",
    "signer": "0xdAC5f4BeaCbE803072072083849A9a0D47C7FC47",
    "userId": "551722"
  }
}