{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x2b87bf5662409c0cacc6c56fe3fbc05a4fcf13658a82660599c09326f9120eff",
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    "signer": "0x0DA81955e67310452357074d6ee39703c163B4B3",
    "userId": "122499259"
  }
}