{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x97429bb8faf6868e4ecca2f4b0c42efa41aed6603f3b8aafc145502b70ffb2b6",
    "signature": "0x1090c770fcc17913fee19af996940e2eb21a49884f8dd12c0834a3cbcea6a3b73746f4bea075d734e4ea6e5a58a8e16136dc22fd57bf92ac822669d3f1b28df01c",
    "signer": "0xA40BB7f136d32cD2fED178eD2b8ac519dA86B8Da",
    "userId": "500561533"
  }
}