{
  "manageEntity": {
    "action": "Save",
    "entityId": "515346915",
    "entityType": "Track",
    "nonce": "0xcf160e4fde42bfc7d73a6eae5ff619993ae60786e07a9b15d2dac8840058d961",
    "signature": "0xd70392ef269a285853494bb34c79397bb507e05473dd3635f1c1206e1223501748ff207edc708dd99bec5eee43f3df760b4e7db242b5c1ff49a842a4d871685a1b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}