{
  "manageEntity": {
    "action": "Save",
    "entityId": "830584801",
    "entityType": "Track",
    "nonce": "0x7afe026ebc51441aeeac896c9f3dce0d52f041d92f285b97662fe12bfb807d6b",
    "signature": "0xf5f6a966e6ead08b9afb55662f65941a03ab383e8d4704d3d23d3ba62396381167769800b494d38791e054cdaaeb1f92c712afda13b92cd67b441bf6c8f89ab91b",
    "signer": "0x4dafC3e774A1033C5604372f17ccBDcE545f478D",
    "userId": "889450527"
  }
}