srry but bitcoin addy was never staked... So am soory signed message isnt available..
I can provide a signed message from the addy from which i claimed a bbcode contest prize.. Check my last posts for info.
signed message from another account doesnt prove ownership over the other. i suggest you to lock this thread, stake an address using the account you are selling and improve the quality of posts until it become a Full Member atleast and by that your account will be worth much much higher than in its situation currently