Tyrion claims he'll have PROOF.
Game of Thrones Season 7, Episode 5
No, but there
are other ways of providing PROOF.
Game of Thrones Season 3, Episode 9
quite the opposite,
if the PROOF of life failed,
Money Heist Season 1, Episode 10
You are their safe conduct, if you don’t
show up at the PROOF of life,
Money Heist Season 1, Episode 10
And when I get PROOF...
Breaking Bad Season 3, Episode 8