{
  "manageEntity": {
    "action": "Save",
    "entityId": "139650853",
    "entityType": "Track",
    "nonce": "0xad2b5baff3a6cb757664212929e7e5ce5f4a7fe7caec89ee2caae0337f6943e5",
    "signature": "0xe365885ae6d56289267543303db206e6c2fdba32d4e0d171b0a8c15424d33f3b347dfc072e9757da6f19ad95e0d0eaa7feaa26ff97dfcef204a5bcffa0f739121c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}