{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0e76121710357a70adcc3abd8419eb7a53dbb312ba5fb0ce4836266656f7f2c5",
    "signature": "0x02f36b217c26d9682fe546912172f15c4e380968a04a6d738753bfd0b15f0f2f11db2cb3fbfe5e763c2c6ae1bc8edfccaede6d84892a12f959e8aa3c99135fbe1b",
    "signer": "0x600ab5340CbcEdF27914F7784164758a7e1eaBF0",
    "userId": "307479286"
  }
}