[mrkeen]

Indeed, whenever I reboot (which is very frequently, because Mastodon will only open, not reopen. If I close it, I need to reboot before using it again) I see the tamper detection. It warns me that I'm using GrapheneOS, not Android.

[palata]

Yeah that's telling you that you are using custom signing keys (the ones of GrapheneOS, which should be compared once with those published on GrapheneOS' website).

Stock Android runs the tamper detection just the same; they just don't warn about the custom keys because the keys are not custom, they are the ones expected by the manufacturer :-).