Bithumb apologized to customers after a payout mistake during a promotion caused a sudden shake-up in bitcoin trading on its platform. In a notice posted in Korean, the South Korea crypto exchange said it was “sincerely sorry for the inconvenience” and blamed “confusion during the payment process for this event.” The exchange said that, during the payout, “an abnormal amount of bitcoin was paid to some customers,” and that selling by some of the accounts led to a brief, sharp move in the bitcoin price on Bithumb.
Bithumb said it spotted the problem right away through its internal controls and then moved fast to limit trading on the related accounts. Bithumb also said the market price returned to a normal level within about five minutes. It added that its “domino liquidation prevention system” worked as designed, so the abnormal bitcoin price did not trigger a chain of forced liquidations. For traders, that detail matters because fast drops can push leveraged positions into liquidation, which can create more selling and even larger swings. Bithumb said that did not happen this time.
In the same notice, Bithumb stressed that the incident was not caused by an outside attack. Bithumb said the issue had “no connection to external hacking or a security breach,” and that there were no problems with system security or customer asset management. Bithumb also said customer assets remained safe, and that trading, deposits, and withdrawals were operating normally after the brief disruption.
Bithumb did not share how much bitcoin was sent by mistake or how many accounts received it. Still, local reporting tied the event to a “Random Box” giveaway. Under that event, Bithumb planned to distribute prizes worth up to 50,000 won. But reports said a payout meant to be 2,000 won ended up being treated as 2,000 BTC for some recipients, which would be a massive sum. Bithumb has been asked to clarify the exact numbers.
On the market side, the bitcoin/Korean won pair on Bithumb appeared to drop hard during the confusion, with reports describing a fall of around 15% before prices recovered. Some users said on social media that their Bithumb accounts were frozen after the abnormal deposits and sales. Bithumb said it restricted trading on the relevant accounts as part of its response.
Regulators also took notice. Reports said South Korea’s Financial Services Commission and Financial Supervisory Service planned to investigate the cause, describing the situation as serious given the size of the potential damage. Another report said about 3 billion won was withdrawn after selling the mistakenly deposited bitcoin. If accurate, that figure would suggest at least some funds moved off-platform before controls fully locked things down.
The incident lands at a time when South Korea is watching crypto exchanges more closely. Recent reporting has described rising scrutiny of major platforms, including checks on how exchanges run promotions and how they present trading conditions to customers. In that setting, a Bithumb promotion error can draw extra attention, even if Bithumb says there was no hack and no customer asset loss.
For users, the key questions are simple: what failed, who got the mistaken bitcoin, and what happens next. Bithumb said it will share follow-up steps in a transparent way and promised to take responsibility so that “not a single customer” is harmed. Bithumb also said it believes there was no loss or damage to customer assets from the incident, though it did not provide a full public accounting of every transaction linked to the payout.
Mistaken deposits are rare, but they can be disruptive because crypto trading runs around the clock and prices can react in seconds. When the mistake involves bitcoin, the impact can spread fast through the order book, especially if recipients try to sell at once. That is why Bithumb focused on its internal controls, its trading restrictions, and its liquidation backstop. Bithumb is one of the largest exchanges in South Korea, and its systems handle high-volume bitcoin and won trading each day.
Bithumb now faces the hard part: proving, with clear facts, that the brief bitcoin crash on Bithumb did not hurt regular traders and that the account freezes were handled fairly. Bithumb said it will disclose more details as it confirms what happened inside the payout process. For now, the exchange’s message is that this was an internal error during a Bithumb event, not a security breach, and that Bithumb’s safeguards kept a bad moment from turning into a wider liquidation wave.