Key Takeaways:
Microsoft's Majorana 2 quantum chip is 1,000 times more reliable than its predecessor, accelerating the timeline for a threat that could expose $461 billion in Bitcoin to theft.
Bitcoin fell on Tuesday as Microsoft unveiled Majorana 2, a quantum chip the company said is 1,000 times more reliable than its predecessor, reigniting debate over when quantum computers could break the cryptography securing the largest cryptocurrency.
"What a quantum computer could do is forge the digital signatures Bitcoin uses today," Justin Thaler, research partner at Andreessen Horowitz and associate professor at Georgetown University, previously told Decrypt. "Someone with a quantum computer could authorize a transaction taking all the Bitcoin out of your accounts."
Microsoft said the new chip achieves average qubit lifetimes of 20 seconds, with some lasting as long as one minute — a more than 1,000-fold improvement over the 1-to-12 millisecond lifetimes of its aluminum-based Majorana 1 design. The company credited its Microsoft Discovery platform and agentic AI tools for accelerating materials research and manufacturing improvements. Microsoft now expects to deliver a scalable quantum computer by 2029, cutting its previous timeline in half.
The breakthrough adds urgency to what the crypto industry calls "Q-Day" — the point at which quantum computers become powerful enough to break elliptic-curve cryptography, allowing attackers to derive private keys from exposed public keys. Some $461 billion worth of Bitcoin is at risk from addresses with exposed public keys, according to estimates cited by Decrypt. Google has projected Q-Day could arrive by 2032, while researchers at Caltech recently suggested the threshold may require fewer quantum resources than previously estimated.
Ethereum Foundation researcher Justin Drake has put 50% odds on a quantum hack occurring by 2032, showing the industry's growing concern. The timeline compression from Microsoft's announcement — cutting its roadmap to 2029 from a prior estimate — suggests progress is accelerating faster than many market participants had priced in.
The selloff in Bitcoin reflects a market reassessment of that risk, traders said. The cryptocurrency's decline comes as the broader crypto market also faces headwinds from macroeconomic uncertainty, though the quantum-specific catalyst added a fresh layer of downside pressure.
Developers are already working on quantum-resistant cryptography for Bitcoin, though no upgrade has been finalized. The timeline for such a transition remains uncertain, leaving a window of vulnerability that Microsoft's latest milestone has narrowed.
This article is for informational purposes only and does not constitute investment advice.
