China's Ministry of State Security has cautioned that cryptocurrency transactions offer criminals no legal shield, arguing that blockchain records can help authorities trace funds and identify users.

In a public statement published on Sept. 28, the ministry highlighted what it described as the risks of treating virtual currencies as anonymous payment tools. While criminals may employ crypto for money laundering, cyberattacks and other illegal activities, it stressed that such transactions still leave digital records behind.

Blockchain Trails Remain Visible

According to the ministry, crypto addresses can create a degree of separation between wallet activity and a person's real identity, but this separation does not amount to genuine anonymity. Blockchain networks preserve transaction histories on public ledgers, the statement said, and investigators can analyze those records and combine them with other data to reconstruct the movement of funds.

That structural transparency is what separates public blockchains from cash: wallet addresses are pseudonymous rather than anonymous, and every transfer is permanently recorded on a shared ledger that anyone can inspect. It is also why on-chain analysis has become a routine tool in financial investigations — the same records that verify transactions can map how funds move between wallets and services.

The ministry also drew attention to crypto exchanges and payment interfaces, noting that conversions between virtual currencies and fiat currencies can generate additional information, including device and internet-related records.

China Tightens Crypto Restrictions

The warning follows a reinforced restrictive stance on virtual currencies from Chinese authorities earlier this year. In February, several government departments reiterated that Bitcoin, Ether and Tether do not carry the legal status of fiat currency in China, adding that virtual-currency-related business activities conducted domestically constitute illegal financial activities. Those measures extended the regulatory focus to areas including stablecoins and real-world asset tokenization.

The February measures built on an earlier framework: China banned cryptocurrency trading and mining in 2021, and regulators have maintained that restrictive posture since, positioning virtual-currency activity outside the country's formal financial system.

The Ministry of State Security also flagged risks surrounding private-key custody. Individuals who lose or disclose their private keys may permanently lose control of their assets, while relying on platforms introduces separate counterparty risks.

The latest statement reinforces a broader message from Chinese authorities: using cryptocurrency does not automatically erase financial trails or remove legal exposure. For blockchain investigators, the transparency and permanence of transaction data can instead provide evidence for tracing how digital assets move between wallets and services.