{
  "manageEntity": {
    "action": "Save",
    "entityId": "268346752",
    "entityType": "Track",
    "nonce": "0x35e3cc6f80a65f136151e42b992cff3238e96dfa139d18225da08f893a8fb4d3",
    "signature": "0x2d7b909057bd46f253a07c2f51f5deb37280807442e6e96569376b6ec83db8bd34c7759306414ced31e1146a8582748cf94d6fd186f6d6c7f4273270a6caa0f31c",
    "signer": "0x4dafC3e774A1033C5604372f17ccBDcE545f478D",
    "userId": "889450527"
  }
}