The address is 1UV4DwJ14CgNL4AigbxUxnExwMNxHiTzc

I have signed a message from that address, the signature is: HLupYhvPQYkIlxT0ENSSn4DLveBgB2lhaP3t0JzeUkkDZrekyO1pIjtTAdR4n7rRL8oG0CMHB0uITSm mOMql46o=

The message is: I am the original owner of the account ccliu, which has been hijacked and used to scam. https://bitcointalk.org/index.php?topic=1325162.0
Thanks.

even if he does shows proof of ownership, a recount of how exactly the account was hacked would be necessary and an explanation as to why he turned a blind-eye to use of his account.