The safest approach is layered: enter the exchange only through its official app or domain, enable every available login and overseas-access control, treat every multi-factor prompt as a real transaction, restrict withdrawal destinations, and keep your phone, computer, email, and recovery number secure. If you approved an unexpected login or withdrawal, stop communicating with the sender, lock the account, revoke access, and contact the exchange immediately.
The steps below use controls documented by Upbit and a checklist you can apply when evaluating other Korean exchanges, including Bithumb. Menus and supported features change, so confirm the current instructions in each exchange’s official help center before moving funds.
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Why Korean-exchange accounts need more than a strong password
A password protects only the first doorway. A cryptocurrency account also exposes deposits, withdrawals, wallet addresses, API access, identity information, and recovery channels. An attacker who persuades you to scan a QR code or approve a two-channel request may bypass the protection you thought your password provided.
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1. Enter through the genuine exchange
Use a known route every time
- Install the exchange’s app from the official app store listing, or type the exchange’s address yourself in the browser.
- Bookmark the verified sign-in page after checking the spelling and domain.
- Open the bookmark or app directly for future logins instead of following links in email, text messages, social posts, chat rooms, or advertisements.
Upbit warns that phishing pages use addresses that resemble the real service. A page can copy the logo, colors, and login form while sending your credentials or QR approval to someone else. An employee, moderator, or support agent who contacts you first cannot make an unofficial link safe.
Check the context before entering credentials
- Stop if a message creates urgency, threatens account closure, promises a refund, or demands a “verification” payment.
- Do not install remote-control software or share your screen to “fix” a withdrawal.
- Use the exchange’s in-app notice or support center to verify an alert; do not reply to the message that triggered your concern.
2. Turn on every exchange-native login control
Upbit controls documented for users
Upbit documents biometric or PIN login, an additional verification step after 30 days of inactivity, and a switch to block logins from overseas IP addresses. Enable each option available in the official app. A biometric or PIN gate reduces exposure when someone handles an unlocked phone; the inactivity challenge catches dormant accounts; overseas-IP blocking can stop a remote login that is not expected.
Use a unique credential and protect recovery
Create a password used nowhere else. A password manager can generate and store a long random value, but the exchange password is only one part of the account: the email address and phone number used for recovery must also be protected with their own unique credentials and multi-factor controls.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesReview the account’s logged-in devices and sessions whenever the exchange provides that view. Remove devices you no longer own, cannot identify, or used only temporarily. Do not leave an exchange session open on a shared computer.
Do not confuse a login approval with a routine notification
A biometric prompt, PIN request, or two-channel certification is an authorization event. Read the screen and the requested action. If you did not just start that login, reject it and begin the incident steps in this guide.
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3. Treat deposits and withdrawals as high-risk approvals
How Upbit’s multi-factor coverage works
Upbit states that KRW and digital-asset deposits and withdrawals use multi-factor authentication and two-channel certification options. That means an approval request can authorize movement of money even when the request arrives in a familiar-looking app or message.
- Start the deposit or withdrawal yourself from the official app or site.
- Read the asset, amount, destination, network, and any displayed fee before approving.
- Approve only when every detail matches the action you initiated.
- Reject, close, and report any prompt for an action you did not start.
Never approve a request merely because a caller says it is needed to cancel a transaction, unlock a reward, or satisfy a compliance check. A genuine compliance process may require information, but an unexpected approval still represents a transfer or login decision.
4. Defeat QR-code phishing
Why an innocent-looking QR code is dangerous
A QR code can encode a login or authentication request rather than a harmless website. The attacker may display it in a chat, on a fake support page, during a phone call, or in a screen-sharing session. Scanning it can bind the attacker’s session to your account, after which a separate approval may authorize access or a withdrawal.
Upbit’s published instruction is explicit: “If you did not personally request the QR code (for example, by clicking the [QR Login] button), never scan it.” Do not scan a code that appears unexpectedly, even if the sender knows your name, account level, or recent transaction.
Safe QR-login procedure
- Open the official app yourself and choose the QR Login function only when you intentionally began that login.
- Confirm that the browser session and device are yours and that the displayed action is login, not a transfer or address change.
- Scan only the code shown by that session; do not scan a code sent as an image or video.
- Read and approve the resulting two-channel request only if it matches your action.
If you scanned an unintended code
Do not wait to see what happens. Log out all devices, lock the account using the official app or support site, restrict withdrawal addresses, change credentials, and contact official support. Review sessions, API keys, registered destinations, and recent transactions for changes you did not make. If a withdrawal is pending, ask the exchange what emergency hold or investigation procedure is available; blockchain transfers that have already settled generally cannot be reversed by changing a password.
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5. Restrict and verify withdrawal destinations
Register only an address you control
Use the exchange’s withdrawal-address registration or whitelist feature where available. Upbit supports wallet-ownership signatures and multi-factor authentication for address registration. Its security information says this applies to digital-asset withdrawals of 1,000,000 KRW or more. The threshold is tied to the withdrawal policy; it is not a reason to treat smaller transfers as safe.
- Open the address-registration screen from the official app.
- Copy the destination address from the wallet you own, then compare it character by character on a trusted screen. Malware can replace a copied address.
- Complete the ownership signature and multi-factor steps requested by the exchange.
- Label the address with a clear purpose, such as “personal cold wallet,” and remove entries you no longer use.
- When practical, send a small test amount first. Confirm receipt on the correct network before sending the remainder.
Protect against address substitution
Verify the network as well as the address. A correct-looking address on the wrong network can be unusable or difficult to recover. For a large transfer, compare the first and last several characters on the exchange screen with the wallet’s receive screen, and have a second person read them aloud if the amount justifies that check.
6. Understand the Travel Rule before a large transfer
Upbit says the Travel Rule applies to transfers worth 1,000,000 KRW or more. The KRW value is calculated using the exchange price at the relevant deposit or withdrawal time, so the same coin amount can cross the threshold as its price changes.
A transfer that reaches the threshold may require destination information or an address-registration step. Keep the receiving exchange or wallet details available, and allow extra time for a compliance review. Do not bypass the process by splitting a transfer solely to avoid a check; that can create delays or additional scrutiny and does not improve account security.
Other Korean exchanges may use different counterparties, screens, or verification sequences. Check the current Travel Rule guidance for both the sending and receiving services before you submit a high-value transaction.
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7. Secure the phone, computer, email, and number behind the account
Device hygiene
- Install operating-system, browser, and exchange-app updates promptly.
- Use a screen lock and enable device encryption where supported.
- Install apps only from the official store and remove software you do not recognize.
- Keep backups of recovery codes in a secure offline location; never store them in a public note or send them through chat.
Email and mobile-number protection
An attacker who controls your email can reset passwords or intercept alerts. Give the email account a unique password and its own multi-factor protection. Ask your mobile carrier about safeguards against unauthorized number transfers, and treat sudden loss of cellular service as a possible security event rather than an inconvenience.
After clicking a suspicious link
Disconnect the affected device from sensitive sessions, update it from a trusted state, and scan it for malware. Change exchange and email credentials from a different, clean device if possible. Security software can help find malware, but it cannot recover a blockchain transfer that was already authorized and confirmed.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.8. What to do when you suspect compromise
Immediate containment
- Stop communicating with the suspected scammer. Do not follow further instructions or negotiate for a refund.
- From the official app or support site, log out all sessions and lock the account.
- Change the exchange password and the password for the linked email account from a clean device.
- Review and revoke API keys, remove unfamiliar devices, and restrict or delete withdrawal addresses you did not add.
- Check deposits, withdrawals, login history, and security settings. Record times, amounts, wallet addresses, transaction IDs, messages, and screenshots.
- Contact the exchange through its official support channel and state clearly that an unauthorized login, approval, or withdrawal may have occurred.
Report suspected illegal activity in Korea
The Korean Financial Services Commission identifies KoFIU, DAXA, and police emergency number 112 as official reporting routes for suspected illegal virtual-asset activity. Use the route appropriate to the incident and preserve the evidence requested. Reporting does not guarantee that a confirmed blockchain transfer can be reversed, but a prompt report can support an investigation and warn other services.
9. How to compare security controls across Korean exchanges
Feature names and availability change. Use the following table as an audit sheet, then verify each item in the exchange’s current official help center before depositing funds.
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| Control to check | Upbit evidence | What to verify on another exchange |
|---|---|---|
| Biometric or PIN login | Documented | Whether it is supported, optional, and available on both mobile platforms |
| Passkey or hardware-key login | Not stated in the supplied Upbit materials | Whether the feature exists, which devices it supports, and how recovery works |
| Overseas-login blocking | Documented as an available switch | Whether blocking is configurable and how legitimate travel is handled |
| Inactive-account challenge | Additional verification after 30 days of inactivity is documented | The inactivity period and the verification method |
| MFA for KRW and digital-asset movement | Documented for deposits and withdrawals | Which transaction types require MFA and whether limits differ by asset or amount |
| Withdrawal-address registration | Wallet-ownership signatures and MFA are documented; the 1,000,000 KRW threshold is stated for digital-asset withdrawals | Whether addresses are whitelisted, how ownership is proved, and when registration is required |
| Account-lock and session revocation | Use the official app or support process | Whether you can lock instantly, revoke all sessions, and reach human support |
| Travel Rule handling | 1,000,000 KRW threshold; value uses the exchange price at deposit or withdrawal time | Current counterparties, required destination data, and review timing |
10. A practical security routine
Before your first deposit
- Confirm the official app or domain independently.
- Set a unique password and secure the linked email and phone number.
- Enable biometric or PIN login, inactivity verification, overseas-login blocking, and every available multi-factor option.
- Read the withdrawal-address and Travel Rule instructions for the assets you plan to use.
Before every withdrawal
- Check the asset, amount, network, destination address, and recipient ownership.
- Confirm that the address is registered and has passed any required ownership check.
- Expect MFA; approve only a request you initiated in the official app.
- For a new destination, send a small test transaction when practical.
Every month and after travel
- Review sessions, API keys, registered addresses, and account notices.
- Remove old devices and destinations.
- Update the phone, computer, browser, and exchange app.
- Recheck overseas-login settings before using a new network or traveling.
11. Common situations and the correct response
“Support” asks you to scan a QR code
Refuse and end the conversation. Open the official app yourself and contact support through its published channel. An unsolicited QR code is not an identity check you should complete.
A two-channel approval appears while you are idle
Reject it, lock the account, revoke sessions, and investigate. Do not approve it to discover what it does.
A wallet address changed between copy and paste
Stop the withdrawal. Assume the device or clipboard may be compromised, run a malware check, and recreate the transaction from a clean device after confirming the address directly with the wallet owner.
A large transfer is held for information
Check whether it meets the 1,000,000 KRW Travel Rule threshold based on the exchange price at the transaction time. Provide the requested destination information through the official exchange workflow; do not use a link supplied by a stranger to “release” the funds.
12. Exchange security and self-custody are different decisions
A hardware wallet or other self-custody arrangement can reduce the amount kept on an exchange for long-term holding, but it does not secure the exchange login, email account, or phone. Protect the exchange account even if you plan to withdraw most assets, and protect the wallet’s recovery material separately. Never enter a self-custody recovery phrase into an exchange login form or disclose it to support.
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