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South Korea’s Upbit halts trading after $37m crypto hack

Upbit, South Korea’s largest cryptocurrency exchange, paused deposits and withdrawals on November 27, 2025 after detecting an unauthorized transfer of around US$37 million in digital assets to an external wallet.

The company said the affected assets were based on the Solana network and valued at around US$37 million.

Upbit said it will compensate users for any losses.

The incident took place a day after Upbit’s parent company Dumanu announced a US$10.3 billion merger with the fintech unit of Naver, a major South Korean technology firm.

🔗 Source: Bloomberg

🧠 Food for thought

Implications, context, and why it matters.

Upbit’s Solana incident saw on-chain LAYER freezes; the exchange will repay users in full

  • An abnormal withdrawal drained US$37 million from Upbit. Stolen tokens included SOL and USD Coin (USDC, a dollar-pegged stablecoin). The funds moved to an unknown external wallet 1.
  • Upbit froze US$8.18 million in LAYER, a Solana-based token, then moved remaining assets to cold storage. The freeze made clear that some on-chain assets can be halted when an exchange moves fast 2.
  • Customers will not lose money 2. Upbit will cover all losses from its reserves.

MPC custody vendors in Asia need Solana support as exchange risks rise

  • Upbit’s breach at South Korea’s largest exchange 1 created urgent demand for MPC wallets built for high-throughput chains.
  • Crypto infrastructure investors face larger exposure because Solana has US$9.2 billion in Total Value Locked (TVL) and 62 million daily transactions 3. Large SOL flows at exchanges increase the attack surface.
  • Transaction monitoring startups can pitch real-time anomaly detection for Solana. The chain claims up to 50,000 transactions per second (TPS) 4. Traditional systems struggle to watch that pace.

Recent Upbit developments

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