Yep, it's called reproducible builds. Amethyst has this active. It means that anybody should be able to check if the APK I published matches the code on the repo by recompiling the app with the same code/parameters.

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but for relays on servers one would need like artifact sharing?

There is no way to know if they are running the version you think they are and/or if they added anything between you and the code you know.

probably need a tool that caches seen on and then rechecks for seen on later

how did you noticed relays deleting things?