{
  "manageEntity": {
    "action": "Save",
    "entityId": "222464",
    "entityType": "Track",
    "nonce": "0x30820fc45774299971586bc331d3ed0142b25fc086dec07176c09e26ec97f8f5",
    "signature": "0xc0a5c626bd12b1d9115153d0872837dfd04b0216dfdb27271fe3295eb0c418186e5c7218202d8aef540c6a8e2e997b5556005dde68fc08c3545a5844dd54fcf51c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}