I thought about it a lot, and I believe that it's a pretty big opening for network analysis (record all open packets at the isp level when looking for specific hashnames to appear) and needs to be protected from since it's very easy to do so right now.  Create the signature just like it is now, but then aes encrypt it, using the sha256 of the ecc key + line id as the aes key, and the attached iv... we'll have to discuss more in theroom or in person this week, but it's a great catch, thanks :)