{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x2e80c4cecf9a2b5f09445cbe35af1ef15479004b5e56ac07807470fe41719505",
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    "signer": "0xaB3cb188f1f007f3a3Ed10BDd1eF15345eDDE18C",
    "userId": "279192109"
  }
}