{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa9bc257fae4c3515bc3244c668a3d03686d513a6676f3c9adedee7108a4209da",
    "signature": "0xeded2fb21a897625cbbbac79796fa57c081bb8434c9b4f7706eb83bbcf1cc50c1abe789e036f02b2fb0acb3e377fdb7e673b1e83a7b14cde11d6b9ce9dd67c161c",
    "signer": "0x9dB5c1fFf1f2a10a2915896538F46804c2A9b8D2",
    "userId": "512641808"
  }
}