Key Takeaways
A new paper from Google’s Quantum AI division argues that the cryptography underpinning Bitcoin could be broken more efficiently than previously understood, intensifying the debate over long-term security risks for the more than $1 trillion asset class.
"Post-quantum is no longer a drill," Haseeb Qureshi, managing partner at Dragonfly, said in a post on X, pointing to the paper's findings that a powerful quantum system could potentially break private keys within minutes.
The research, published March 31, outlines a more efficient implementation of Shor's algorithm. Alex Pruden, CEO of Project Eleven, noted a crack time faster than Bitcoin's average 10-minute block time could make active transactions a target before they are confirmed on-chain. Google itself has accelerated its internal deadline for migrating to post-quantum cryptography to 2029, a move The Hashgraph Group CEO Stefan Deiss called a "wake-up-call."
The findings shift the timeline for "Q-day"—when quantum computers can defeat current encryption—from a distant threat to a more urgent engineering challenge. While quantum-resistant algorithms exist, migrating a decentralized network like Bitcoin or Ethereum would require years of coordination and could introduce new risks, according to Binance founder Changpeng Zhao.
Some experts warn of "harvest now, decrypt later" strategies, where adversaries collect encrypted data today with the intent of breaking it once quantum computers are powerful enough. Hundreds of billions of dollars in Bitcoin are held in wallet formats that could be vulnerable to such future attacks.
Ethereum researcher Justin Drake described the paper as a "monumental" development but cautioned that timelines remain probabilistic, estimating a small but meaningful chance of a cryptographic break in the early 2030s.
Zhao argued there is "no need to panic," as the network can be upgraded. However, he acknowledged the process would be complex. "There will likely be many debates… resulting in some forks," Zhao said, adding that new code could introduce unforeseen bugs.
This article is for informational purposes only and does not constitute investment advice.
