I seem to recall LC suggesting that they'd update their website with some kind of proof of hashing this weekend?
Edit: Perhaps I'm mentally combining posts.
The team is scattered on various countries, thus we have to coordinate to release anything. I'll see if i can get a screenshot of the hashing rate or something, but more pictures will be posted in the next few days, we will deploy the same mechanism ASICMINER uses for signing found blocks and publish them on our website.
https://bitcointalk.org/index.php?topic=263445.msg3116236#msg3116236