{
  "manageEntity": {
    "action": "Save",
    "entityId": "1499408317",
    "entityType": "Track",
    "nonce": "0xb544d3689deda57e2ca21829ad7b6c44bdf2bcb4e89a37363e03aa0c41c38586",
    "signature": "0x32356830ce92edc1cb27067594b351e8db457adf8128dfa8e6e2493be9c37baa7873f947c454fead021eb35fe33a4f92d92ef4edd34e6ad854f60dc89355fe3d1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}