{
  "manageEntity": {
    "action": "Save",
    "entityId": "1486786286",
    "entityType": "Track",
    "nonce": "1790010871997469114",
    "signature": "0x2070f25c2043f8ef8c1a02811d2d797bf6585dfc5ab3be92de2d0c895edbf610278a43ff1503dad3da9af160f6ba63085cbb4f8fba8797e7a930975b270e23ef1b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}