BTCC has an official account here on the forum here's the account
https://bitcointalk.org/index.php?action=profile;u=552507They actually minting physical coins before based on his posts history but last 2018 they stop minting physical coins and the account's last active is May 3, 2020.
They turn into an exchange and they also own a pool.
Since the account is not active for a long time I don't think if it is safe to use they already have negative feedback from DT here on the forum and I heard some posts here on the forum that they are scammer. So I suggest better use other exchanges than risking your investment.