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Polkadot DOT Security Alert on April 13, 2026: Why Korean Exchanges Halted Transfers and Why the Bank of Korea Wants Circuit Breakers

A practical breakdown of the April 13, 2026 Polkadot DOT security alert: Bithumb and Coinone suspended DOT deposits and withdrawals, broader coverage tied the incident to a bridge exploit, and the Bank of Korea used the same day to push for crypto exchange circuit breakers.

KrptoPay Team·April 13, 2026·8 min read

Polkadot DOT news today: what changed on April 13, 2026

If you were searching for the biggest crypto story on April 13, 2026, one of the clearest market-moving developments was the sudden Polkadot (DOT) security alert that pushed Korean exchanges to halt transfers while the Bank of Korea used the same day to argue for tougher exchange safeguards.

This matters because it is not just another token-specific incident. It combines three market signals at once:

a live exchange response to a security issue tied to DOT
a same-day central bank warning about weak exchange controls
a broader reminder that crypto market structure risk is still as important as token fundamentals

For users, the takeaway is simple: when exchanges suspend deposits and withdrawals at the same time regulators call for circuit breakers, the story is bigger than price.

1. Bithumb halted DOT deposits and withdrawals on April 13

The strongest primary-source signal came from Bithumb.

In an official notice published at 2:16 p.m. KST on April 13, 2026, Bithumb said it would temporarily suspend Polkadot (DOT) deposits and withdrawals because of suspected security issues. The exchange said trading could continue, but transfers would stay paused until network stability was secured.

Minutes later, in a separate investor-caution notice published at 2:30 p.m. KST, Bithumb said it had confirmed signs of a security incident related to DOT, warned of possible volatility, and linked a specific Ethereum transaction for reference.

Those two notices matter for two reasons:

Bithumb did not frame the halt as routine maintenance or a planned network upgrade
the exchange explicitly warned users to be careful because volatility could increase

That is usually a sign the issue is being treated as a live market-integrity risk rather than a standard operations pause.

2. Coinone also halted DOT transfers at the same time

The move was not isolated to one platform.

Coinone published its own notice on April 13, 2026, saying it had temporarily suspended DOT deposits and withdrawals at 2:16 p.m. KST after confirming a DOT security issue. Like Bithumb, Coinone said trading could continue while transfer services remained paused.

When multiple exchanges react on the same day in the same direction, that usually tells users the market is dealing with a real risk-management event rather than a platform-specific problem.

In practical terms, it means traders should distinguish between:

trading availability: , which may still be open
transfer availability: , which may be shut down while exchanges contain risk

That difference matters because a token can still trade while liquidity, arbitrage, and withdrawal confidence deteriorate.

3. Broader coverage tied the alert to a Hyperbridge exploit

The exchange notices themselves were careful and limited in detail. They confirmed the transfer suspensions and warned users, but they did not publish a full incident report.

Broader crypto news coverage on April 13, 2026 connected the DOT alert to an alleged Hyperbridge exploit. Reports from outlets including The Block and Crypto Briefing said the market reaction followed security alerts that tied the incident to unauthorized minting and selling pressure linked to DOT on Ethereum.

That wider coverage helps explain why the exchange response was immediate. Still, the most important point for users is not the rumor layer. It is the official exchange behavior:

Bithumb paused DOT transfers
Coinone paused DOT transfers
Bithumb issued an explicit volatility warning

Those are the facts that users could act on in real time.

4. The Bank of Korea used the same day to call for crypto circuit breakers

The second major development came from the Bank of Korea (BOK).

On April 13, 2026, the central bank published its 2025 Payment and Settlement Report. Broader reporting on the release said the BOK used the report to argue for stronger internal controls at crypto exchanges, including circuit-breaker-style safeguards and systems that can automatically verify whether internal ledgers match blockchain balances in real time.

That policy push was linked to the earlier Bithumb bitcoin over-crediting incident in February 2026, when the exchange mistakenly distributed 620,000 BTC instead of 620,000 won worth of bitcoin during a promotional event.

The timing is important.

On the same date that exchanges were freezing DOT transfers because of a security scare, the central bank was publicly arguing that crypto venues need:

stronger internal controls
automatic abnormal-activity detection
real-time balance verification
trading curbs when markets become disorderly

That makes April 13 look less like a random one-off and more like a market-structure warning.

5. Why this story matters beyond Polkadot

The obvious headline is DOT. The bigger issue is exchange resilience.

Crypto users often focus on hacks, exploits, or token price moves after they happen. But the more durable story is how fast exchanges detect problems, what they freeze first, and whether regulators think current controls are strong enough.

The Bank of Korea's same-day message sharpens that point. If exchanges can face major disruption from operational errors in one quarter and token-specific security events in another, policymakers are likely to keep pushing the industry toward more bank-style safeguards.

For businesses, treasury teams, and serious users, that means platform risk assessment should include questions like:

How quickly can an exchange halt risky transfers?
Can it separate transfer risk from trading risk?
Does it reconcile internal balances against onchain balances in real time?
How clearly does it communicate security incidents to users?

What happened on April 13, 2026

Event	Exact date	What was confirmed
BOK publishes 2025 Payment and Settlement Report	April 13, 2026	Same-day reporting says BOK called for crypto circuit-breaker-style safeguards and real-time balance checks
Bithumb halts DOT deposits and withdrawals	April 13, 2026 at 2:16 p.m. KST	Bithumb cited suspected security issues
Bithumb issues DOT investor caution notice	April 13, 2026 at 2:30 p.m. KST	Bithumb warned of possible volatility and linked a transaction
Coinone halts DOT deposits and withdrawals	April 13, 2026 at 2:16 p.m. KST	Coinone cited a DOT security issue

What KrptoPay users should watch now

whether Korean exchanges resume DOT transfers after confirming network stability
whether more exchanges issue investor-protection notices tied to DOT
whether Polkadot ecosystem teams publish a fuller incident explanation
whether South Korean regulators move from recommendations to formal exchange-control requirements

FAQ

Why did Bithumb suspend DOT transfers on April 13, 2026?

Bithumb said it saw signs of a suspected security issue involving DOT and paused deposits and withdrawals at 2:16 p.m. KST on April 13, 2026 while keeping trading open.

Did Coinone also halt DOT transfers?

Yes. Coinone said it suspended DOT deposits and withdrawals at 2:16 p.m. KST on April 13, 2026 after confirming a DOT security issue.

What did the Bank of Korea say on April 13, 2026?

The Bank of Korea published its 2025 Payment and Settlement Report on April 13, 2026, and same-day reporting said the central bank called for stronger crypto exchange safeguards, including circuit-breaker-style controls and real-time ledger-to-blockchain verification.

Was this only a Polkadot story?

No. DOT was the immediate asset involved, but the broader story is about exchange risk controls, incident communication, and whether crypto venues have strong enough systems to contain abnormal events quickly.

Sources

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