South Korea’s Financial Supervisory Service opened a formal investigation after Bithumb mistakenly credited users with an estimated $40–$43 billion worth of Bitcoin as internal “phantom” balances tied to roughly 620,000 BTC. The key issue is that the supply existed only inside Bithumb’s ledger, exposing how an exchange can momentarily decouple internal accounting from on-chain reality.
The error occurred during a promotional event on February 6, 2026 and quickly rippled through Bithumb’s own market, creating a sudden, platform-specific liquidity shock. What turned this from a routine operational incident into a regulatory flashpoint was the speed at which a ledger mistake translated into real trading dislocation for users.
How the “ghost” Bitcoin balances were created
Bithumb attributed the incident to a human input error: Bitcoin units were entered where Korean won amounts were intended, producing large “ghost” BTC balances that never originated on the blockchain. CryptoQuant analyst Maartunn captured the discrepancy succinctly by saying the 620,000 BTC were “purely virtual entries, existing only within Bithumb’s internal systems.”
Early reporting did not even agree on how many accounts were affected, with figures ranging from 249 to 695, while the phantom entries still aggregated to roughly 620,000 BTC. The mismatch between user-count estimates and the headline BTC figure has become part of the scrutiny because it suggests a single point of failure inside internal controls.
Regulators framed the episode as more than a one-off mistake, arguing it highlighted systemic weaknesses in how exchanges run their internal ledgers. The FSS said the error “laid bare the structural problems of virtual asset exchanges’ ledger systems” and warned it revealed “fundamental weaknesses” that need a legal remedy.
Even though the phantom balances were not on-chain, they still distorted Bithumb’s internal price formation in real time. Bithumb’s BTC/KRW market dropped sharply, with the platform’s listed Bitcoin price briefly falling to around $55,000 while global markets were comparatively stable.
Cleanup, inconsistencies, and user remediation
Bithumb said it recovered 99.7% of the erroneously credited Bitcoin and covered the remaining 0.3% from its own reserves, describing that remainder as roughly 125 BTC valued at $123.4 million. At the same time, security notes and on-chain observers flagged numerical inconsistencies between the 620,000 BTC ledger figure and the recovery percentages Bithumb reported.
On user remediation, the exchange outlined a broad compensation package, including reimbursements and fee relief designed to restore confidence after the dislocation. Bithumb said the measures included 110% reimbursement tied to price drops, a 20,000 won payment to users connected during the incident, full reimbursement plus 10% for users who sold at the artificial lows, and a one-week waiver of trading fees.
The company also pledged upgrades such as stronger verification controls and AI-based anomaly detection, while regulators said they will evaluate segregation of duties and reconciliation standards, and consider whether legal action is warranted. The immediate takeaway is that investigators are treating reconciliation, internal-control design, and market-harm outcomes as the core tests of compliance readiness.
Stepping back, the incident is a reminder that centralized exchanges can create “market truth” internally even when the blockchain never moved, and that gap can carry real consequences for users and counterparties. In practical terms, the episode renews focus on proof-of-reserve expectations, forensic auditing, and real-time ledger-to-chain verification as the FSS completes its probe.
