{
  "manageEntity": {
    "action": "Save",
    "entityId": "1355283720",
    "entityType": "Track",
    "nonce": "0x9e401dc11d4621e6e1d0cc77c9b4cb5a7e0ae692815b3e783d45de0b36299a9a",
    "signature": "0xf0945e71c4aa96c884d001eea05ce6a4c838e4ab0ed884db3ee3ae08e6cd6d4f3323f4c5b005460def915bc9efc7b8a99a95ec16cac486d2f7ebc8c4531fd9fa1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}