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Replied to a post on github.com :

Chiming in ('cos I wrote this bit)...

The hashes are a direct hash of the image URL, which is written to a file in the simplest way possible ;) If you're getting a new image each time it's because the actual url of the image in the webmention has changed (which I think @snarfed pointed out).

I did think about storing last modified/etags but wanted to get things running quickly and wanted to avoid storing accounting information on files where possible...