On Tuesday 13 October 2026 South Korea’s Financial Intelligence Unit (FIU) announced that it is blocking the websites of 27 unregistered crypto exchanges, naming KuCoin, BitMart and MEXC. The step was approved by the Korea Communications Standards Commission after reviews on 6 and 7 October, and it means that a user in Korea who deposited coins on one of those platforms may now find the site unreachable (CoinDesk, 13 October 2026). The lesson reaches beyond Korea: whether an exchange is allowed to serve you is a fact you can check before you deposit, not after. This guide gives six checks that take about ten minutes, and scores them on the Korean case.
What happened in South Korea
According to CoinDesk, foreign exchanges must register with the FIU and meet security and anti-money-laundering requirements to legally serve South Korean customers. Only 28 virtual-asset service providers are currently registered. The 27 platforms now being blocked are unregistered ones; the FIU has referred 44 unregistered operators to investigators and says it will seek further blocks if sites reopen under new addresses. Regulators can now ask for a website block as soon as they detect unregistered activity, without a court ruling or proof that any customer lost money. The move extends 2025 restrictions, when Google and Apple removed the exchanges’ mobile apps.
The FIU warned that users of unauthorised platforms may have trouble recovering their funds, said it would work with the Digital Asset eXchange Alliance (DAXA) to help affected customers, and urged investors to check registration and withdraw assets from unauthorised operators. KuCoin’s spokesperson said: “We respect applicable laws and regulations across jurisdictions” and “User assets remain safe and secure, and we will communicate any further updates through our official channels.” The article gives no effective date for the blocks and no registration deadline. CoinDesk adds that an estimated $110 billion left domestic Korean exchanges in 2025 as investors moved assets overseas, which shows how large the unregistered-exchange market is. We report these as claims by the regulator and the company; Bitcoin Mastery has not independently verified either side.
Check 1: Find the register for the country where you live
Start with the regulator that governs your own residence, not the exchange’s home. An exchange registered in one country may be unlicensed in yours, which is exactly the Korean situation: the FIU’s rule applies to anyone serving Korean customers. In the European Union, the regulator-maintained list is the register that ESMA publishes under the Markets in Crypto-Assets Regulation, which includes authorised crypto-asset service providers (ESMA MiCA page). In the United States, platforms that exchange or transmit virtual currency are generally treated as money transmitters that must register with FinCEN as money services businesses, under guidance FinCEN issued in 2013 (FinCEN guidance FIN-2013-G001), and many states add their own licences. In the United Kingdom, crypto firms must be registered with the Financial Conduct Authority, whose public register is searchable (FCA register). If you cannot find your country’s register, that is itself a warning.
Score for Korea: pass on process. Korea publishes a registered set of 28 providers, so any user can see whether a platform is in it. The 27 blocked platforms are, by definition of the FIU’s action, not.
Check 2: Search for the legal entity, not the brand
Exchanges trade under brand names, but registers list companies. The legal entity is usually named in the terms of service or the footer, along with a registration or company number. Search the register for that exact entity, and read the entry: is the licence held by the company that actually runs your account, or by a sister company in another country? A brand search that returns nothing is a red flag, but so is a brand search that returns a different company. Write down the company name and number before you deposit. The Korean case shows why: KuCoin, BitMart and MEXC are consumer brands, while the registration obligation falls on the operator serving Korean customers.
Score for Korea: the CoinDesk article names brands, not corporate entities, so a Korean user would need the terms of service to check. We could not confirm from the article which legal entities are involved.
Check 3: Read the scope of the licence
A registration is not a blanket approval. Look for what the firm is allowed to do (spot trading, custody, derivatives, staking), which customers it may serve, and any conditions or restrictions on the entry. In the EU, authorisation is for specific crypto-asset services; in the US, MSB registration is an anti-money-laundering registration and not a guarantee that funds are protected. A firm that is registered for one service may be unregistered for another it advertises. For a custodian, ask a separate question: whose name is on the account where your coins are held, and what happens in an insolvency? Registration tells you a regulator knows about the firm; it does not tell you the firm is solvent.
Score for Korea: the FIU’s requirements include security and anti-money-laundering standards, so registration there implies those minimums. They do not protect against a failure; the FIU message to unregistered platforms’ users is to withdraw.
Check 4: Make sure the website and app are the official ones
Impersonation is common. Open the exchange from the link shown on the regulator’s register entry or from the company’s verified channels, not from a search advertisement or a message. Compare the domain letter by letter. The FIU said it will seek further blocks if a blocked site reopens under a new address, so a changed address is a reason to re-check, not to relax. If a platform tells you to use a different address to get around a block, treat it as a reason to stop and check, not a reason to continue.
Score for Korea: the removal of the exchanges’ apps from the Google and Apple stores in 2025 was the earlier signal that these platforms were not accepted locally.
Check 5: Read the restricted-jurisdiction list in the terms
Most international exchanges list countries where they do not serve customers. Read that list in the terms of service, not the marketing page. If your country appears, the exchange is telling you it is not authorised to serve you. If it does not appear but the platform is not on your regulator’s register either, the silence is not permission. Also note how the exchange handles identity checks: a platform that accepts deposits without verification where your law requires it is not meeting its obligations. The Korean rule is a registration requirement; other countries use licensing, geo-blocking or both.
Score for Korea: we do not know from the report which jurisdictions the 27 platforms list as restricted. This check should be run against each platform’s own terms.
Check 6: Plan the exit before you deposit
Assume that any platform, registered or not, can become unavailable: because of a block, an insolvency, a hack or a withdrawal freeze. Before sending meaningful sums, test a small withdrawal to a wallet you control, record how long it takes, and keep records of deposits and withdrawals for tax and evidence. Keep only what you need for trading on the exchange. For long-term holdings, a wallet where you hold the keys avoids counterparty risk, but a wallet has its own checks: see our hardware-wallet tamper guide and the latest Ledger update. If you decide to move assets away from a platform, move them to an address you have verified with a small test first.
Score for Korea: the FIU urged withdrawals. The practical lesson is that the time to test withdrawals is when everything is working. Do not assume that using a different network address solves a legal problem; if you live in a country that restricts a platform, ask a local adviser before using it.
Putting the six checks into one table
| Check | What to look for | Korea example (from CoinDesk) |
|---|---|---|
| 1. Register | Your own country’s regulator list | FIU register: 28 providers |
| 2. Entity | Legal company name and number | Brands named, entities not |
| 3. Scope | Services, customers, conditions | Security and AML requirements |
| 4. Official site | Domain matches the register entry | Apps removed 2025; sites blocked 2026 |
| 5. Restricted list | Is your country excluded? | Not stated in the report |
| 6. Exit plan | Test withdrawal; limited balance | FIU urged withdrawal |
What this does not tell you
A registered exchange can still fail, and an unregistered one is not necessarily fraudulent. Registration is evidence that a regulator has a record of the firm and has set conditions on it; it is not a safety rating. We have not verified claims by the FIU or by KuCoin, and no effective date or deadline was given in the report, so Korean users should check the FIU’s own announcements. This guide is general information, not legal advice, and the rules differ by country.
If you are following the regulatory story, our midterm-money update covers the US side, and our guide to following a crypto bill explains how to track legislation that may change these rules.
Method: bitcoin and ether prices, highs, lows and closes are Coinbase Exchange candles (UTC day or UTC hour) pulled by Bitcoin Mastery at about 06:15 UTC on Wednesday 14 October 2026; the 14 October candle is still open at that time, so any closing figure quoted is the 13 October close unless stated. Semiconductor-ETF (SOXX) and Kospi figures are Yahoo Finance daily closes; other third-party figures are attributed to their source and date. Facts about the South Korean action come from CoinDesk’s 13 October 2026 report; regulator links point to the issuing authority’s own pages. The Korean “scores” are our reading of that report, not an audit of any exchange.
Disclaimer: This article is for informational purposes only and does not constitute investment advice. Bitcoin and other cryptocurrencies are volatile and you can lose some or all of the money you put in. Nothing here is a recommendation to buy, sell or hold bitcoin, any exchange-traded fund, any listed security or any other asset, and the technical levels, probabilities and scenarios discussed are descriptions of published data, not forecasts. Do your own research and consult a licensed financial advisor before making investment decisions.