I think I am still missing what you are referring to. The guide on Threema's site promts you to extract the APK from your phone via adb which you then `diff -r`

I think I am still missing what you are referring to. The guide on Threema's site promts you to extract the APK from your phone via adb which you then `diff -r` with the locally compiled version. [1] As far as I am aware it does not matter whether Google or Threema modified the APK before uploading it to the Play Store since you would notice either way. [1]https://threema.ch/en/open-source/reproducible-builds https://threema.ch/en/open-source/reproducible-builds