One thing i've realised. Is that you can simply open a replay that matches the criterea, but with a different person, then go /lp 1 NameOfBounty then edit the very last frame (so it saves properly). And it looks like you have done it, and you can upload it and claim the prize.
So i was thinking that you should make the person of whom the bounty was placed on has to confirm that the person who claims to've got the bounty wasnt lieing....
understand? :P