If i use multibit that doesnt mean i must know how to sign messages.
If you say it is eassy then i see no problem verifying account is mine.
This will be done when the buyer appears, to not waste a time
you dont realize this has to be done for the buyer to appear at all......
i think i smell something, let me check the kitchen...
This is not a problem to prove all you ask. I can give a free vouch for green trusted member. Bet from my acc and if the bet would be lost i can take back 10%. We can try with 0.01 and see what happens.