There is metadata alongside the APK (as nostr events) but there is no wrapping. The hash is checked on the original APK.

The heavy part is finding where exactly they publish, Proton is inconsistent AF. And then keep checking for updates - provided they don't move things around. Thats why Github/Gitlab are easy, they are predictable and accessible via API.

I just found Pass on Fdroid, so its indexed now.

Searched for Calendar on Obtainium, I only see garbage. Can you share which source you got it from in Obtainium?

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Got it.

Proton does a garbage job of this, no doubt.

Calendar seems to be the worst, as it's a static URL, so Obtainium flails away.

From here: https://proton.me/calendar/download

You'll see this: https://protonmail.com/download/CalendarAndroid/ProtonCalendar-Android.apk