{
  "manageEntity": {
    "action": "Save",
    "entityId": "662092623",
    "entityType": "Track",
    "nonce": "0x4448ba9fefc6dc561b6f644903b62c187f1329ae790c8dc3c07702f1b7484297",
    "signature": "0xe8ca0d54ba0ccdfbf358b6d8742f03ca1bf28387e13de9700dfeb4d7425e0f5f4b577a41fcacbfc2862a83be60c5bc6cc1b91b649ae288a3e3ef9dba7229178d1c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}