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What do you know, this has been posted in another comment in the thread: https://news.ycombinator.com/item?id=13823704

It's not that difficult to do if you use a weak hash (eg crc32) and bruteforce it.

Also you could pad the file with some extra data, but that feels like cheating.

How about a comment containing it's own item ID ...? 20456050

Actually, quantum mechanics allows this