{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x362e623e256a95b3b8dcf555790077ecf9702f98e990bb450a05b3b87365e050",
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    "signer": "0x1F7AD5e639e74f62C577d6ee9140C839b0100481",
    "userId": "513323235"
  }
}