{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xe865d21264df735cae5fdc5e28d75428c3f4baad5c89bfc0e314f4a41e7249c8",
    "signature": "0xb911bdbe33526c28742717c389a27d1933efb293314ef1d92b0a7b18f2b1b15240b952f3ef4a7adffa5be960a95e53e22818a11bbacf7454457a70aafab752141b",
    "signer": "0xB440ddd46d6951DAe4d5dE522cb611f68976E0B9",
    "userId": "859491807"
  }
}