{
  "manageEntity": {
    "action": "Save",
    "entityId": "406139",
    "entityType": "Track",
    "nonce": "0x66deb319ea6d0daf4175928d6047718665c4a11eda90cdd87e0cdd5652ca9a7a",
    "signature": "0x97babba11ca800e0ae65ba1da78876e7282624cf16195dc48df90f25c19054e3748ed948aa4b0dea19ce1f911859e3bad569e83504986f5998e01a71b115ea201b",
    "signer": "0x136A4e19270387bc21d7e58a9592D46864B0Ad57",
    "userId": "956002390"
  }
}