Yes, we trade a few times. It is my address on CEX.io exchange
I changed my password due to security reason. I just signed a message on 15QLwhoYgaVt7nMUm5NCV1Z13VCqD12x9f It is one of my first BTC address I ever used.
My new address is from hardware wallet, and I do not use any more other addresses.
Here is a post with the signature of this address:
https://bitcointalk.org/index.php?topic=996318.msg51496873#msg51496873Also, current active address staked here:
https://bitcointalk.org/index.php?topic=996318.msg30908712#msg30908712
About address connection - they could be alt accounts, friends, trading....need better proof. I've PMd him link to your post.
thank you for turning my attention to this and your answer here.