{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa33e151f00b631389c8c35e76ddbf71c8e7a12f520bfd07fe89772281aa02d09",
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    "signer": "0xd66e743f0CF90f603D5F8501Aae3034AFAba4093",
    "userId": "147515794"
  }
}