Signing a message with 1LrPYjto3hsLzWJNstghuwdrQXB96KbrCy would be appropriate... also, a message at a website which may be compromised doesn't guarantee much IMO.
(Nick had the same idea as me it seems...)
Both good points. Also lol at person indignant that they're not paid for the work done googling site:instawallet.com
It's instawallet.