The Chinese Quantum Shock: Blockchains Facing the Imminent Q-Day. $BTC

In May 2025, China achieved a major milestone in cybersecurity by conducting the first quantum-encrypted voice call over 1,000 km between Beijing and Hefei. This feat is based on a nationwide quantum key distribution (QKD) network covering 16 metropolises, already protecting 500 government agencies and 380 public companies. In parallel, China unveiled the Tianyan-504, a superconducting quantum computer equipped with 504 qubits, accessible via the cloud and which has registered more than 12 million connections from 50 countries. These advances mark a transition from experimental status to operational reality, signaling an acceleration toward "Q-Day," the day when quantum computers will be able to break classical cryptography.