I can provide a signed message from my public bitfunder shareholder address, I also don't see how can this be considered a blackhole?  Is this not the reason for providing a shareholder in my control so that after providing a signed message, dividends can continue to paid as that signed message is proof of ownership of the bitcoin address.

I also didn't use a google email for bitfunder either so how would you verify my ownership of  shares if you do not accept a signed message as proof?