{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x02d80c3b2c539336f91abfe472ff307573ffc2bc409d3d704d6f04f70997eb0d",
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    "signer": "0xe609a3E781d3C5b319EFb939103da2b64BFD1e13",
    "userId": "908630831"
  }
}