{
  "manageEntity": {
    "action": "Save",
    "entityId": "143174221",
    "entityType": "Track",
    "nonce": "0x8964dca8886c02650cd13912cae202cb6d922d8068dd3284a65ddd976ba6e841",
    "signature": "0x66691b5277c0c42841d98cbad306f7fdfbafff4781fa712ce708f7ed578718017ed3229f62415b64c10239f3c7a5d3761f1f070d18c7ba90567e10fc203b0f3c1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}