{
  "manageEntity": {
    "action": "Save",
    "entityId": "221350",
    "entityType": "Track",
    "nonce": "0x75b817978b19556b41b319d641a9df25a5844e441fb776b5e2d55ea78aacdf97",
    "signature": "0x7c4b3cf763fb2db4071b7e83f2296d4abb09228d672606a65abd50f45c544366081ef556dac40cee4624bfe90840e138053c7df1ac570dc61d67f324498141e31c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}