{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x7a7291475df504d23546531e4d2f93db797a347d8faf6cbee21a781ed038e817",
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    "signer": "0x2a2e74e39b471D87bcfBFc73f6A403ee62B9B227",
    "userId": "856623252"
  }
}