{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd56dd731f083761f4951715206bb45e79695254e7770db749119001061184c76",
    "signature": "0xbf3145460e70ee83e9c9b45025460fb47fcd04ad3403b5fde11c4ec09c1b1b560694d935f13640701629cfad45b39ccb75602e294a7347574fab3a8e442b31151c",
    "signer": "0x2fff57D5628D87Ce98d02775C9cF63dB765aa6c5",
    "userId": "640804276"
  }
}