Bithumb wins another court victory in the $43 billion Bitcoin case…

Bithumb sued its own users. Why?

Bithumb won a lawsuit again, demanding that users return the proceeds generated by bitcoins that were mistakenly received during the February promotion. This is the second victory for the South Korean cryptocurrency exchange in four civil lawsuits sparked by the error. The Seoul Central District Court ruled on Thursday that the defendant must return the proceeds from the sale of bitcoins incorrectly credited to his account. The case involved approximately 194 million won (approximately 140,500 U.S. dollars) and was the second-largest case in the four unjust enrichment lawsuits filed by Bithumb in March. The largest pending lawsuit currently involves approximately 500 million won (approximately US$362,200). The lawsuits target users who sold bitcoins that were mistakenly received and failed to repay all of the proceeds. Bithumb's successive court victories are significant because they enhance the exchange's ability to legally recover funds that cannot be recovered through internal systems. The court's ruling did not regard bitcoin that was mistakenly received as an asset that users had the right to retain, but supported Bithumb's argument that the gains generated from the error were unjust enrichment.

How did Bithumb accidentally deposit 620,000 bitcoins?

The dispute dates back to February, when Bithumb mistakenly credited 620,000 bitcoins to hundreds of users participating in the promotion. At their value at the time, these bitcoins were approximately US$43 billion. According to reports, the error occurred because the staff mistakenly entered the reward unit as Bitcoin instead of Korean won. As a result, the internal customer balance increased abnormally, far exceeding the amount originally planned to be released by the event. Bithumb moved quickly to restrict affected accounts and recovered most of the bitcoins mistakenly credited, but some users had already sold some of the balance. The deals forced exchanges to pursue residual proceeds through civil litigation. The incident also affected Bithumb's trading market. BTC-KRW trading pairs fell by about 15% at one point as users who received the wrong bitcoins began to sell, which meant that background operations were misdirected temporarily affected the prices of customers who did not participate in the promotion. South Korean authorities subsequently launched an investigation into the exchange, focusing on whether its internal controls and risk management systems were adequate to prevent such large-scale errors from being credited to customer accounts.

What should investors think?

Bithumb's victory in court has increased its chances of recovering residual earnings, but for investors, the bigger issue lies in operational control. A mistake that can create tens of billions of dollars worth of internal bitcoin balances raises questions far beyond the funds themselves that are still being sought in court.

What does a court victory mean for Bithumb?

The second victory reduced some of the uncertainty in Bithumb's recovery process. If similar ruling logic is applied to the remaining cases, the exchange will be more likely to recover the proceeds earned by users who sold assets before Bithumb corrected the erroneous balance. The amount involved in the lawsuit is small compared to the value of the original 620,000 bitcoin errors, because Bithumb quickly recovered most of the incorrectly credited assets after discovering the problem. However, the legal outcome did not resolve the operational issues raised by the incident. Regulators have been investigating how an employee mistake could generate such a large amount of Bitcoin in the exchange's internal accounts and why existing inspection mechanisms failed to prevent the transaction before a customer's account was credited. For exchanges, internal account controls are particularly important because customer balances can be changed without a corresponding blockchain transfer. This makes the approval process, transaction limits and automated inspections important safeguards against human error or unauthorized activities.

Will this incident affect Bithumb's IPO plans in 2028?

The court ruling comes as Bithumb faces another major test: its planned initial public offering. The exchange said earlier this month that it aims to complete the IPO in 2028. This plan has brought more attention to governance structures, risk control and operational resilience. Open market investors are likely to look not only at Bithumb's trading volume and revenue, but also at whether management has addressed the weaknesses exposed by the February incident. If Bithumb continues to recover residual proceeds, the lawsuits themselves may become less important. But regulatory responses could have longer-term implications, as weaknesses in internal control can affect compliance costs, management oversight and investor confidence before a listing. Bithumb currently wins two of four civil lawsuits related to the error. Further victories will help settle the financial aspects of the matter, but the exchange still needs to prove that mistakes of this scale will not happen again as it moves towards a public company.