{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xe0b9c2494d5a8daf9eaf03a50783bd5905ef975ed97965f4fe06b33346e1b5cf",
    "signature": "0xf49af3188cb81c4a77d89fda1fe60aa3a33228eb23df0aee8fd01205f5a9537d5e218f55a29b0b173c7cbaebff4eae13c68ec7c2989a17565a861d1855d007301c",
    "signer": "0xBD9646b3F709697468041872EEB6d53c3EDaccfC",
    "userId": "754769888"
  }
}