{
  "manageEntity": {
    "action": "Save",
    "entityId": "1384818964",
    "entityType": "Track",
    "nonce": "0xc78a66464761e7d69829dbca5a5ac5fdfa4cec66011be3508877c71ac941d535",
    "signature": "0x8a63942a1958837544d35db91fd7264d232e22b7e1079b400b6c68e5e78a6884719728baadd7ff4f2d5dccdb259d567ee635603a2ea135059e7c701023a8f9991c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}