The exchange stated the amounts will be refunded, and it has removed all other assets to cold wallet storage.
Following the attack, Bithumb has stored all assets in "safe cold wallets", according to Reuters.
"If they do find your crypto-currency wallet or hack online crypto exchanges and transfer the coins - then it is basically gone forever". It has suspended all services, including coin deposits and withdrawals.
A leading South Korean cryptocurrency exchange said on Wednesday that $31m worth of virtual currencies have been stolen by hackers, a latest in the series of recent hacks that raised security concerns.
"[Notice for the temporary suspension of the deposits].Due to the increasing safety issues, we are changing our wallet system".
On June 16, Bithumb announced an abrupt server check "in order to maximize security settings".
It added the company will fully compensate customers.
Bithumb is thought to be the sixth largest exchange in the world based on its trading volume of over $370m. A short time ago, prices for bitcoin had fallen by 2% to around $US6,600. Right now we have already saw a small dip as the price currently sits around $6,600 as the announcement about the Bithumb cryptocurrency hack was just made almost 30-40 minutes ago upon writing.
In its announcement, Bithumb didn't disclose the exact details of the coins that were affected in the hack and in what quantities. Without an independent audit or third-party report into the incident, however, it is hard to know exactly what happened.
Hackers have made off with 35bn won (£24m) worth of cryptocurrency.