South Korea Weighs 99% Cold Wallet Rule for Crypto Exchanges

South Korea wants hackers to find an emptier cash drawer. The Financial Services Commission is weighing a bump in the share of customer crypto that exchanges must park offline, from 80% up to about 99%, according to Crypto Briefing. Nothing is signed yet — the higher number is a priority under review, not a rule on the books.

The current 80% floor comes from the Virtual Asset User Protection Act, which took effect July 19, 2024. Under that rule, an exchange can keep up to a fifth of customer holdings in internet-connected hot wallets. Push the floor to 99% and that shrinks to roughly one coin in every hundred, leaving far less for a remote attacker to reach.

The urgency has a trigger. The FSC called an emergency meeting with major domestic exchanges and related bodies on November 2, 2026 to review security practices. On the table: tighter access controls, refined withdrawal procedures and stronger protection for user assets. Central to the discussion was getting more customer funds into cold storage. Regulators stopped short of setting a binding threshold, instead pressing exchanges to go past the 80% legal minimum.

The ground had already been prepared. In February 2026, the FSC said it would consider moving the cold wallet ratio toward 100% as part of new regulations. A reported security breach at Binance, described in research findings as unauthorized withdrawals from hot wallets totaling approximately $6.3 billion, appears to have sped up a conversation already on the calendar.

Some Korean platforms are ahead of the curve. Upbit held 99.17% of customer assets in cold wallets as of end-September 2026, according to the figures — already above the proposed level. Bithumb reported 94.76% for the same period, comfortably clear of the 80% floor but a few points shy of 99%. Other exchanges showed varying compliance.

The tradeoff is operational. Exchanges need hot wallet liquidity to process withdrawals fast, and refilling from cold storage is a manual, security-heavy process. The research findings note higher cold storage requirements could raise operating costs and potentially influence trading fees. Platforms already near 99% would barely notice; thinner-margin exchanges sitting lower would need room to rebuild their custody setups. Also in play: whether the FSC lands at about 99% or pushes toward the 100% it floated earlier, and whether the access-control and withdrawal measures from the November 2 meeting become formal requirements.