China Declares Cryptocurrency Trading Services Illegal

The People's Bank of China declared all cryptocurrency-related transactions illegal in the country's most severe crackdown.

The historically important point is the procedural stage captured by this event: China Declares Cryptocurrency Trading Services Illegal. The action affected Bitcoin directly where Bitcoin fell within the rule or market being discussed, while broader digital-asset language is not treated as Bitcoin-specific.

Placed in the broader 2021 chronology, the event helps show how Bitcoin was simultaneously becoming a subject of institutional finance, public policy, technology development and mass culture. Its inclusion reflects the specific historical development described above rather than a claim that every related market reaction was caused by this event alone.