{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x708e29905556342b0a631714941dfbf74085245e95d2bf138f4e8ee0d4004e0d",
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    "signer": "0xdE77ab6ecdF00f63939F775B1F46d8F0D7A53AB7",
    "userId": "300398894"
  }
}