can you sign message from your old posted bitcoin address to prove the account isn't hacked?

They were deposit addresses, I never staked a real address. And if you haven't noticed, the deposit addresses don't exist anymore because I haven't used them in months (sites are down)
https://blockchain.info/address/126TRZBGSVd2MCFhyDpVXeXkYjUF8XVG9Q