If you worry about that just format the partition with the OS iso instead of using ventoy. Ventoy is harmless but you never know what can happen and if you're t

If you worry about that just format the partition with the OS iso instead of using ventoy. Ventoy is harmless but you never know what can happen and if you're that paranoid for good reasons, having a signature file that can vouch for your iso not being modified + being 100% sure you are booting into that ISO defeats all the conveniences in the world that Ventoy or Any-other-solution gives you.