Thanks, googling the code or url does seem like a good idea to check for leaks.

I suppose putting something in the description (either post or on jigidi) that if there are more people joining than solving it on jigidi then the giveaway will be deleted because of leaks. That might dissuade people from leaking it. Although, it still would allow some extra people in as not everyone who does the jigidi enters, but at least not very many.

Edit: although I tried it now with your battlefield giveaway (I had entered so I can still see the link), and nothing comes up with google. I wonder if they removed it already, or if you can't always check through google.