{
  "manageEntity": {
    "action": "Save",
    "entityId": "1029949876",
    "entityType": "Track",
    "nonce": "1793578197637049369",
    "signature": "0x8613b79eccdf8093261ee0634ae26232acd6bbad3b04b05f4df0044bdbd3615a47434972157e36bad36618824621092672087f5ba08961a17c97dc106dc282111b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}