South Korea tax agency eyes crypto custodians

TLDR

South Koreas National Tax Service (NTS) is moving to outsource seized crypto storage to licensed private custodians after a serious security lapse.

1. The NTS plans to select a private custodian for confiscated crypto after a wallet seed phrase leak led to about $4.8 million in losses.
2. Candidate custodians must meet strict security, scale, and insurance standards under the Virtual Asset User Protection Act, creating a clearer institutional bar for Korean crypto custody.
3. This move fits a broader trend of tighter tax oversight, including AI tools and rulings that keep offshore crypto firms under Korean tax scrutiny.

Deep Dive

1. What The NTS Is Changing

In February 2024, the NTS accidentally published a photo showing a Ledger device and an unblurred recovery phrase in an official release, which enabled unauthorized transfers of around $4.8 million in seized tokens. That failure pushed the agency to rethink self?custody of government crypto holdings.

The NTS is now seeking a private custodian for seized assets, drafting criteria and targeting a provider selection by the first half of 2026, according to reports citing NTS officials and ZDNet Korea. This would end the practice of handling confiscated wallets internally and shift them to specialist firms.

2. New Bar For Crypto Custodians

Reports say custody candidates will be evaluated on several factors, including:

1. Technical security (cold storage, multi?party authorization, strong operational controls).
2. Company size, financial health, and track record with institutional or government clients.
3. Compliance with South Koreas Virtual Asset User Protection Act, including mandatory insurance coverage.

A dedicated NTS task force is updating manuals for seizure, storage, and liquidation, and preparing a centralized digital asset division to oversee all crypto-related work. For local custody providers, this is both a compliance burden and a business opportunity if they can clear the higher bar.

3. Part Of A Wider Oversight Push

This custody shift sits alongside other tax and enforcement moves. The tax authority is funding an AI system to analyze crypto trading data and flag under?reported income, with deployment targeted before the end of 2026.

Separately, South Koreas Tax Tribunal has affirmed that blockchain firms registered offshore can still be taxed domestically if their real management and decision-making are in Korea, reinforcing substance-over-form scrutiny of offshore crypto structures.

Taken together, Korea is pairing stricter supervision and better tooling with more professional infrastructure for any crypto that touches its tax system.

Conclusion

South Koreas tax agency is handing seized crypto to professional custodians, tightening standards after a high-profile security breach. For traders and firms, the signal is clear: Korean authorities are treating digital assets as a serious, supervised asset class, with stronger custody rules and more sophisticated tools to track activity, even when operations are routed through foreign entities.