{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5c73e982576f3150a08b0de4ed34dc32fc4c94be1b6b448e22393c9e800e7121",
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    "signer": "0x7c73CD99a6B25A6DE60A0D8191D1c71f1380eC8E",
    "userId": "621382778"
  }
}