{
  "manageEntity": {
    "action": "Save",
    "entityId": "468747952",
    "entityType": "Track",
    "nonce": "0x8f3eef9800fb15936ccaf7807ca15a4000c839f01170980ba80a128c70a0c96d",
    "signature": "0x54d8cdba27942d5cabb46f67fd2b1d4aa95aff4742926a5b3da20fc6d912aed41cb0266d9e14fb48c282e0916f53703dafd2e0e46752feb385d09ba35dcc11ee1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}