Unless I'm misunderstanding your challenge, this doesn't sound too hard to do. If your evidence can go onto the 'net, then all you need to do is set up a website that will take a page live on date/time X unless you log into the admin page and manually change the go-live date. IIRC, MovableType already has that kind of functionality out of the box, and even if they don't, it's a pretty trivial hack.

All you'd need is to set up and pay for a hosted website that isn't obviously tied to you. A bit more of a challenge, but if you could find a place that will allow you to pay cash for one of those preloaded Visa debit cards, then you could pay for the account without your actual name being attached it.

You're still vulnerable to being tortured into revealing the location/password, though.