{
  "manageEntity": {
    "action": "Save",
    "entityId": "459789927",
    "entityType": "Track",
    "nonce": "1787954512477833454",
    "signature": "0x91fc12e88314a8c749cdafce9fb34a75160baaa7d9626401f2f03433f20c83cc752694b4ea5c7665621832579f120a55200ed008a4bc7af38bb8fc33a9c6173f1b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}