South Korean Authorities Fine Bithumb Over Overseas User Data Sharing

South Korean authorities have fined crypto exchange Bithumb $136,000 after concluding that the company shared user information with overseas exchanges in violation of laws designed to protect customer data.

The decision matters because user information is one of the most sensitive assets handled by crypto platforms. For exchanges, the case underscores that regulatory obligations extend beyond trading, custody and market conduct, and include how customer data is transferred and protected when working with overseas counterparties.

According to the reported findings, the investigation determined that Bithumb had shared information with many overseas exchanges. Authorities concluded that this activity breached rules intended to safeguard personal data.

The fine adds to broader pressure on crypto firms to meet compliance standards as digital asset markets become more closely supervised. Data governance, cross-border information sharing and privacy controls are increasingly part of the regulatory expectations facing exchanges.

Bithumb is one of South Korea’s major crypto trading platforms, making the case notable for both local market participants and international firms that interact with Korean exchanges. The penalty is modest in dollar terms, but it signals that user data practices remain a live enforcement issue for the sector.