{
  "manageEntity": {
    "action": "Save",
    "entityId": "491211488",
    "entityType": "Track",
    "nonce": "0x8be2bc0eff7d90973f30b438c52e066a8ecf8175087ebed7ae3e05fa2ac7c8af",
    "signature": "0x5033235954490843ace3dfbfd33c53d1e3f53314e2952ad57532f9f968c41ab1691b5ed5c378abf46a1c7e10907cb51ee516372a673cc5ce184fc2899380b6721b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}