# Bitcoin quantum computing security risks > Live situation record from CLSTR: https://clstr.news/situations/20261012-bitcoin-quantum-computing-security-risks > Updated: 2026-10-12T03:25:00.000Z. Sources: 4. Developments: 2. Bitcoin is facing growing scrutiny regarding its long-term cryptographic security in the face of advancing quantum computing. Data indicates that approximately 6.26 million BTC, or 31.2 percent of the total supply, are held in addresses with exposed public keys, a figure that has increased since early 2021. This exposure makes these assets potentially vulnerable to quantum attacks through the use of Shor’s algorithm to derive private keys. Recent projections from various artificial intelligence models suggest varying levels of risk over a 20-year horizon. While short-term risks through 2028 are estimated to be extremely low, long-term estimates for a cryptographic break range from 34 percent to 76 percent. In response to these technological threats, the National Institute of Standards and Technology (NIST) has released post-quantum cryptography standards. Experts are urging an immediate transition to new protocols, noting that replacing vulnerable cryptographic systems can take up to two decades. Concurrently, market data shows a shift in investor behavior, with significant capital moving out of centralized exchanges toward long-term storage. ## Timeline ### 2026-10-12: AI models project varying risks to Bitcoin cryptography from quantum computing AI models estimate a 34% to 76% chance that Bitcoin’s cryptographic security could be compromised within 20 years, primarily due to the long-term threat posed by advancing quantum computing. 2 sources. https://clstr.news/cluster/ai-models-project-varying-risks-to-bitcoin-cryptography-from-quantum-computing ### 2026-10-07: Bitcoin faces quantum security risks and massive exchange outflows Bitcoin faces growing quantum computing risks for 6.26 million BTC due to exposed public keys, even as massive exchange outflows signal a shift toward long-term investor accumulation. 2 sources. https://clstr.news/cluster/bitcoin-faces-quantum-security-risks-and-massive-exchange-outflows --- Cite as: Bitcoin quantum computing security risks. CLSTR, https://clstr.news/situations/20261012-bitcoin-quantum-computing-security-risks