What a great and simple way to put my idea into use.  Thanks for posting this.  I like this implementation.  It's simple to see and if you weren't aware of it or cared, it isn't in any way disruptive.  When I think about how much money could have been saved from users falling victim to MITM scenarios with this feature, it makes me feel like this should be a fairly important feature that should be implemented either on this forum, or the new one.  It seems like so many of the recent forum changes have centered around turning users against each other as they compete for merit and trust, it would be nice if a feature was put in place to help protect those that need protecting instead of empowering users who advertise services to launder money for successful scammers.