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Does anyone actually do that? And what if you have a million files? And what happens within that 30 mins? I guess you could download and check your million files once ever 30 seconds...

Well, you would just check the final download dmg/iso file, and only do it for the first n-versions or so (since those will be the most popular.) The other ones can be checked too, but at a much lower frequency.

Or you know, just sign the application bundle. macOS has bundle signing for a reason. To make it even better, enable sandboxing for the application as well.

So everyone's supposed to maintain heartbeat servers for all their downloadable files now?