{
  "manageEntity": {
    "action": "Save",
    "entityId": "1990651445",
    "entityType": "Track",
    "nonce": "0xe05f816981a0b7b81f415b6819cd51692cb516f0065a0a9bd5f3bba963ae369c",
    "signature": "0x11f5b9f25c16d7be3894fd4b0b9d8598929a510c9dda60f393f06e4d27c97ba84a953db4a0305b8e83ff0e45f63aeed49de68190772e85eb91070d112ba891b71c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}