Bithumb Wins First Unjust Enrichment Lawsuit in South Korea
South Korean exchange Bithumb won its first unjust enrichment lawsuit, with the court ordering a user who sold mistakenly issued Bitcoin to return the proceeds from the sale.
The incident occurred during a reward distribution event in February. Bithumb originally planned to issue rewards in Korean won but mistakenly credited 620,000 BTC units to a user's account due to a system error; this credited amount did not represent the actual Bitcoin held and deliverable by the exchange.
Upon discovering the error, the platform froze withdrawals and recovered 618,214 mistakenly credited BTC units before they were traded; the remaining 1,786 units had been sold by some users, prompting Bithumb to initiate recovery procedures against four users who did not return the sale proceeds.
On August 27, Judge Kim Yu-seong of the Seoul Central District Court ruled in the first instance, supporting Bithumb's claim for approximately 194 million won, equivalent to about $140,000, in unjust enrichment; this case is the second largest in terms of claim amount among four cases.
The other three cases have claims of approximately 500 million won, 14.8 million won, and 5 million won, totaling about 519.8 million won; this case is subject to first-instance judgment, while the other cases are still pending trial, and the relevant parties may still appeal according to the law.
From a market mechanism perspective, if orders sold from the mistakenly credited accounts enter the order book, it could expose the exchange to asset gaps, abnormal transactions, and counterparty settlement risks. Bithumb mitigated actual outflow by freezing withdrawals and subsequently sought to recover fiat proceeds from those who had sold; the pressure falls on users who exchanged the erroneously credited assets and retained the profits, while the beneficiaries are the exchange and regular customers, as recovery helps restore the platform's financial integrity and prevent losses from being socialized.
Source: Public Information
ABAB AI Insight
The erroneous issuance of assets by exchanges is not unique to the cryptocurrency industry. In 2018, the Japanese exchange Zaif mistakenly sold Bitcoin to users at nearly zero prices due to a system failure; traditional financial markets have also experienced "fat finger" trades, erroneous dividends, and incorrect postings. The common structure is that the system interface first displays the tradable balance, while the authenticity of the assets and settlement capability are subsequently subjected to risk control checks. Bithumb's freezing of withdrawals before the erroneous asset transactions indicates that the account balances at centralized exchanges are essentially platform ledger receivables, rather than on-chain Bitcoin immediately controlled by users.
Bithumb's capital path involves first enhancing trading speed through centralized custody and internal ledgers, and then restoring the value transferred out due to ledger errors through legal recovery. After users sold the mistakenly credited BTC, the exchange faced not the issue of "irreversible blockchain transactions" but rather the settlement obligations in Korean won or other assets generated from internal matching; thus, the platform can pursue recovery through freezing, auditing, KYC identity verification, and civil litigation. This model shifts the ultimate loss from technical errors from the platform's capital to the account holders deemed to have received unjust enrichment.
This case can be compared to Mt. Gox's prolonged bankruptcy proceedings due to private key and transaction management errors, and FTX's asset gap created by mixing customer assets with related party funds. The latter two involve actual asset control and solvency crises; Bithumb's incident is closer to an internal accounting error that could be intercepted in a timely manner. The industry is transitioning from "can it be traded" to "can it be proven that every available balance has real assets, risk control thresholds, and rollback disposability" in operational control.
Essentially, this reflects a regulatory change: exchanges are increasingly being viewed as financial infrastructures that simultaneously bear custody, clearing, and market operation responsibilities. The mechanism at play is that centralized platforms concentrate the storage of identities, balances, matching, and withdrawal permissions, with efficiency coming from internal ledgers, but a single point of error can quickly spill over into client asset risks. Regulations and courts clarify the obligation to return erroneous profits through unjust enrichment rules, prompting platforms to strengthen thresholds for abnormal distributions, dual approvals, pre-trade risk controls, and asset proof.
ABAB News · Cognitive Laws
Account balances are commitments, not assets themselves
On-chain irreversibility, platform ledgers can still be frozen
System errors create wealth, law determines ownership