{
  "manageEntity": {
    "action": "Save",
    "entityId": "543606",
    "entityType": "Track",
    "nonce": "0x48977c603d2024ef63af53289969b658629eacd006ace744f0cb502fe4a03301",
    "signature": "0x23a00666afafe04344b66180aafb30abbb24a79afa3c7aef4eb536186a99b12c088a5c6a946a19454ef742bbfa798d31f318667ec316026d12197abb4f7743441c",
    "signer": "0x1EEEf459C8e361773166d5681a5066659BC751D5",
    "userId": "210033902"
  }
}