TRON founder Justin Sun has adopted a slightly more bearish stance on Bitcoin (BTC), arguing that advancing artificial intelligence algorithms and quantum computing developments pose existential threats to the cryptocurrency's underlying cryptography that ETF investors have failed to price in.
AI and Quantum Breakthroughs Threaten Cryptography
In an interview with William Joy, Sun explained that rapid progress in AI mathematics might allow classical computers to crack legacy cryptographic standards even before full quantum machines materialize. "If you ask about my personal view, I am currently slightly more bearish. The reason is straightforward: the algorithm evolution of AI and the issue of QD (quantum computing). I believe it will be difficult for BTC to walk away unscathed from this," Sun stated.
Recent scientific breakthroughs have accelerated these concern timelines. In March 2026, Google Quantum AI revised its estimates, revealing that fewer than 500,000 physical qubits could compromise Bitcoin's security—marking a 20-fold reduction from prior estimates. Subsequently, on October 15, researchers published findings in Science demonstrating magic state cultivation on Google's 105-qubit Willow chip. The test achieved 99.99% fidelity while reducing physical errors roughly 40-fold, effectively addressing a major bottleneck in quantum scaling.
Over 6 Million BTC Sitting in Exposed Addresses
The threat specifically targets legacy address formats where public keys are exposed on-chain. Data from Glassnode's co-founder shows that 6.04 million BTC—representing 31.2% of total mined supply—reside in exposed addresses, with some estimates reaching as high as 6.9 million BTC.
Sun warned of severe market consequences if these cryptographic protections fail: "Once QD or AI decryption arrives, these dormant assets will be breached, and in the worst case, the market could see massive selling pressure of more than 2 million BTC. Given BTC's extremely high degree of decentralization, it is extremely difficult for the community and miners to reach consensus to freeze, confiscate, or restrict circulation through a hard fork."
To address these vulnerabilities, Coinbase issued technical guidance on October 13, calling for early ecosystem preparations such as staged hybrid protections and flexible output types. Even as Bitcoin holds key demand zones and market analysts monitor price movements alongside Bitcoin volatility compression, long-term consensus upgrades could take years to implement across the decentralized network.
Key Takeaways
- Justin Sun warns that AI and quantum computing threaten Bitcoin's fundamental cryptography.
- Up to 6.04 million BTC (31.2% of supply) sit in vulnerable exposed public key addresses.
- Google's Willow chip achieved 99.99% fidelity on October 15, reducing qubit requirements 20-fold since March 2026.
- Coinbase urged early adoption of hybrid protection protocols on October 13.
Why It Matters
While market participants currently trade Bitcoin based on macroeconomic trends and ETF flows, quantum decryption presents a technical tail-risk event that standard valuation models ignore. Upgrading Bitcoin's core protocol to post-quantum cryptography requires network-wide consensus, which historically moves at a deliberate pace. If developer communities fail to deploy post-quantum upgrades before hardware breakthroughs mature, dormant coins from Bitcoin's early era could become vulnerable to unauthorized movement, creating systemic supply shocks.
