{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x983b3ff83733b3090d42fa59b0343132812e65814b98d1f0def2f0e6fb69b159",
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    "signer": "0xaA7359D75a4445a569c53A8C47CeCB62Aa739AB4",
    "userId": "136519704"
  }
}