Justin Sun Warns of AI and Quantum Risks for Bitcoin
Sun points to possible pressure from AI and quantum computing on Bitcoin cryptography. The debate also touches ETF holdings and when post-quantum security becomes necessary.
Key Takeaways
- Justin Sun says he has become more bearish on Bitcoin because of possible risks from AI and quantum computing to its cryptography.
- According to Sun, investors holding Bitcoin through ETFs may not yet have fully priced in these long-term risks.
- Google and Coinbase point to progress and preparation around quantum threats, while TRON wants to roll out post-quantum signatures.
TRON founder Justin Sun says he has become more bearish on Bitcoin because he thinks AI and quantum computing could eventually put pressure on the network’s cryptography. According to Sun, investors holding Bitcoin through ETFs may not yet have fully priced in these risks. That means the debate is not just about technology, but also about how long Bitcoin’s current security can hold up.
Sun Points to Crypto Risks
In a conversation with William Joy, Sun said he has become “somewhat bearish.” He said the development of AI algorithms and quantum computing together could create new problems for BTC. In his view, it may be hard for Bitcoin to get through that completely unscathed.
Sun also pointed to research that has picked up speed over the past few months. In March 2026, Google Quantum AI estimated that fewer than 500,000 physical qubits could be enough to break Bitcoin cryptography. That was a big drop from earlier estimates.
Why This Is Coming Up Now
Google also reported further progress with its Willow chip on October 15. Researchers there showed magic state cultivation, which reduced errors by about 40 times. The experiment reached 99.99 percent fidelity. Willow itself still has only 105 qubits, but the result does show that the machines needed for such attacks could get smaller.
The broader crypto sector is also looking at protection against this kind of risk. In April 2026, Sun already said that TRON would be the first major public chain to roll out NIST-standard post-quantum signature schemes on the mainchain. That fits into a broader search for quantum-resistant solutions in crypto.
Bitcoin is facing the same question elsewhere in the industry too. Europol previously warned that wallets and exposed public keys in particular could become vulnerable if quantum computers keep advancing.
What This Means for Investors
For European crypto investors, this matters mainly because Bitcoin is increasingly held through investment products like ETFs. If the discussion around quantum risks keeps growing, it could affect how firms think about long-term security. At the same time, this is still a technical debate for now, because there is no machine anywhere near that kind of attack capability yet.
Coinbase already called on the industry on October 13 to prepare well in advance, before a cryptographically relevant quantum computer exists. Sun’s comments therefore fit into a broader debate about when Bitcoin and other networks need to move to stronger protection.
