{
  "manageEntity": {
    "action": "Save",
    "entityId": "119891594",
    "entityType": "Track",
    "nonce": "0xd5b1b3758defd0c5010c578a4019e8f454070e2d6df4e17b6e9334828c53c5d4",
    "signature": "0x9b194bfad61b587a43fed971ea7dbaf697ce9640388a5233d51d4fa5de5eeb2f27d3a8d3041176f95e9abdff082c3cb5ca44d383e597949967781d7866df5f3d1b",
    "signer": "0x45C74e4f36E4e5064C5321eeED3748fD52B04eA8",
    "userId": "133970929"
  }
}