South Korean exchange Bithumb says a staff input mistake on February 6, 2026 caused roughly 620,000 BTC—valued in the $40–44 billion range and often cited around $43 billion—to be wrongly credited to 695 accounts, sparking a sharp dislocation in the BTC/KRW market on the venue and drawing immediate regulatory attention. This was an operational-control failure with real market impact, not a routine outage.
Bithumb linked the incident to a breakdown inside its promotional backend, where a “critical logic error” allowed a mistyped reward configuration to propagate into live balances. The combination of a flawed control path and high-value asset distribution created a rapid, exchange-level shock that required containment measures within minutes.
How the error cascaded through trading
Bithumb’s explanation centers on a unit-handling mistake: a staff member mistyped reward units in a way that effectively treated Bitcoin as Korean won inside the promotion logic. A single input validation miss became a platform-wide ledger event once the system interpreted the wrong unit at scale. The result was an anomalous crediting of unusually large BTC amounts to hundreds of users and a reported ~10% flash crash in the BTC/KRW pair on the exchange.
Once the anomaly was detected, Bithumb says it moved quickly to ring-fence affected activity by blocking trading and withdrawals for impacted accounts while engineers rolled back the faulty process and stabilized operations. The immediate objective was to stop further propagation, prevent additional forced price discovery, and preserve an auditable path to remediation. In a February 9 update, the exchange said it secured about 99.7% of the erroneously distributed BTC within minutes of identifying the issue.
Customer remediation and regulatory escalation
Bithumb paired the technical rollback with a compensation plan meant to restore user confidence and demonstrate customer-first remediation. The remediation posture was designed to close the trust gap created by a preventable internal error. The exchange said it would pay 20,000 won (about $13.66) to every customer who was logged in during the incident, and it committed to full reimbursement of realized losses for traders who were forced to exit at disadvantageous prices, plus an additional 10% on top of the reimbursed losses.
Regulators also moved into response mode, with the Financial Supervisory Service (FSS) launching on-site inspections to assess Bithumb’s internal controls and determine whether any manipulation or other misconduct occurred alongside the operational failure. The regulatory posture signals that exchanges will be judged not only on security posture, but on operational discipline, change management, and market-integrity safeguards. Parliamentary sessions were convened to discuss tighter rules for virtual-asset platforms, and officials signaled potential increases in IT-operations penalties for exchanges that fail basic safeguards.
For the broader market, the episode is a reminder that “promotional systems” are not low-risk subsystems when they can touch balances, trading eligibility, and withdrawal paths. Expect heightened pressure for stronger input validation, stricter change-control gates, independent forensic review, and clearer incident-timeline disclosure as part of post-incident governance. Next steps implied by the exchange’s posture and the regulator response include completing forensic audits, patching backend controls, and closing out the expanded probes in ways that could reset compliance expectations and IT-operations liability for Korean exchanges.
