{
  "manageEntity": {
    "action": "Save",
    "entityId": "729736",
    "entityType": "Track",
    "nonce": "0x50f408883312038319a8779fef9baa9976cfa1a0a7c341a9983867605764ed2a",
    "signature": "0x6406b42191899c4cb4e60b3fe9af92722538391dbc3d26f8fa0759ad4b55066d0e57c7a8c7a7b9b412c2bf4186d572264e020580f5f61fa6beb029aa15a7589e1c",
    "signer": "0x280ca97a4b844B0848d04CEEc59eb4f44dc7d794",
    "userId": "390095"
  }
}