{
  "manageEntity": {
    "action": "Save",
    "entityId": "1897023125",
    "entityType": "Track",
    "nonce": "0xb04f8c570555c3b4ef2778852701bf4b576f3e86d3e850b4dbf23382ad837a49",
    "signature": "0x635f11f5f0e16e9ddf84409cb33e41df3e0370538897a19ef6cfc02fe668950a438dbec8380c6dbc99a478df7cb626ad0da4f7a8aaa43d11f15703f8e0b79d8a1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}