{
  "manageEntity": {
    "action": "Save",
    "entityId": "1681036018",
    "entityType": "Track",
    "nonce": "0x575e06cd67475f8b2eecc1a0334a1f75bc777e9f4a3702b13cc75c4f78413c75",
    "signature": "0x85dd0f0ca1ebf1d173c7b92a0f2130fa624210621e5aefbd74b5bb94c44f487c7478d378b6dda502b2608abfadc6502e8d3f68b7baf93cf08ff9e836ca14d4eb1c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}