{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x351752a307945f1cdc948533037a8010d60d79e00debe48a46b7231b4df0313f",
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    "signer": "0x878510CB0c61D96b6a56128f7c3f30516f239902",
    "userId": "524590012"
  }
}