Can you point us to some more reading regarding this? This is contradictory to something that another user said awhile back. I had assumed that signing an ETH would be equally acceptable, so I'm wondering if there are any official statements regarding this? I'm not saying you're wrong, because you would know better than I would, but I just swear I remember a staff member suggesting that someone sign a message from their ETH address to prove ownership of their account. Not sure if this is a contentious issue, or what the case is, but I would love to read more on this. Is there security concerns when it comes to signing a message from an ETH address or is there no satisfactory way to verify these messages?