{
  "manageEntity": {
    "action": "Save",
    "entityId": "555098",
    "entityType": "Track",
    "nonce": "0xe906c54b09221c9320218a2d7c50d731327bbcbc7235065cc244d6f3072e1458",
    "signature": "0x5bb8232acebd9a7782067f400b5c9aecfeae8d2e9118bd102d16a5c2e01a353224ffa697a34672f9ff2c580c170dd75dfdc6eb0cdadddc834d2fc36a0c0413a11b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}