Bithumb is a real, regulated Korean company. It has operated since 2014, is registered with South Korea's Financial Intelligence Unit as a virtual asset service provider, holds a real-name account partnership with KB Kookmin Bank, lists more than 470 coins, and has been preparing a domestic stock listing. It is the second-largest exchange in Korea by volume and it publishes its fees, listings and suspensions in the open.
Its record has rough patches. Bithumb was hacked in 2018 and 2019, and on February 6, 2026 an internal input error credited about 620,000 phantom bitcoin to 249 accounts, some of which was sold before a freeze, cratering its BTC price and triggering a Financial Supervisory Service investigation, fines and compensation orders. That was operational failure, not fraud, and Bithumb disclosed it, clawed most of it back and went to court for the rest. It is still the kind of event that makes people ask whether an exchange balance is the safest place to keep coins.
For a U.S. searcher the practical answer is that Bithumb is genuine and unavailable. It does not open accounts for Americans, so any message offering to set one up, or any site with a Bithumb-like name asking for a deposit, is the thing to be suspicious of.