{
  "manageEntity": {
    "action": "Save",
    "entityId": "1857089209",
    "entityType": "Track",
    "nonce": "0x8ae1e95df0d006fd3a3d0450d2a8cf7f59c780e50816271de742e859ff60cbce",
    "signature": "0xf6feec1eca224d1ba9072581f1a30f1999847a510a05274769b112077141cef579a4902458e39387582b5cb87b7a15e8fa748ed99bc3889ab6949abfcd4e852f1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}