{
  "manageEntity": {
    "action": "Save",
    "entityId": "1394899418",
    "entityType": "Track",
    "nonce": "0x70217507d323234006c923e7bf2b5a7d10b49fd4dfd2501cf56260640b32beaf",
    "signature": "0xf5f9e6ab5be8ff0d51f9667a8aca13e8b2030ed040dbfac86a931064e19bd43249127d8155a54da2fd2aacb1d8874d5b6245afaddb39a3782e20678a56756d4f1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}