[grncdr]

I’ve never seen “proofed” used as anything but a hyphenated suffix meaning “protected against”. E.g. sound-proofed.

It’s pretty normal to use “proved” in place of “observed” or “measured” in day-to-day speech though. Usually a few repeatable measurements are enough proof (evidence) for most people to consider something “proven”.

Edit: I forgot the proofread meaning pointed out by the sibling comment.