{
  "manageEntity": {
    "action": "Save",
    "entityId": "1440286738",
    "entityType": "Track",
    "nonce": "0x9433872d397820c1438a7205cbc38861a612370cfd18a34409e4c30b468fb9fa",
    "signature": "0x1ce4df7b3623978fb32645ef8626bc03725d7ec359653aaf5778ba85c3477aa17b3fd7fc2453c9d35a82fbcaf8d11fd386ff0130e277df9ab495841326194dd71b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}