Will Quantum Computing Destroy Ethereum and Bitcoin Before 2028? Experts and AI Weigh In
By Kurt Robson | Published Nov 19, 2025 | 11:33 AM UTC
Amid rising excitement and concern about quantum computing’s capabilities, fresh warnings from Ethereum co-founder Vitalik Buterin and top researchers have reignited debates on the security of major cryptocurrencies like Bitcoin (BTC) and Ethereum (ETH). The key question: Could fault-tolerant quantum computers break the cryptographic foundations of these blockchains before 2028?
The Quantum Threat to Blockchain Security
Ethereum’s Vitalik Buterin recently addressed developers at the Devconnect conference in Bangkok, sounding an urgent note about the narrowing window to prepare for a quantum breakthrough. “Elliptic curves are going to die,” he declared, referencing the elliptic curve cryptography (ECC) that underpins Bitcoin and Ethereum’s security. Predictions indicate that quantum computers able to break ECC could materialize within the next few years.
Adding weight to these concerns, Scott Aaronson, a renowned quantum computing professor at the University of Texas at Austin, stated on November 13 that a fault-tolerant quantum computer implementing Shor’s algorithm could feasibly threaten Bitcoin’s underlying cryptography before the next U.S. presidential election in 2028. —
Why Are Bitcoin and Ethereum Vulnerable?
Both Bitcoin and Ethereum rely heavily on ECC to secure transactions and wallets. This cryptography is presently robust against classical computers but vulnerable to quantum algorithms that can efficiently solve the integer factorization and discrete logarithm problems ECC depends on.
According to a Deloitte report cited by experts, roughly 25% of all Bitcoins in circulation are already susceptible to potential quantum attacks. This vulnerability arises mainly when reused wallet addresses or poorly secured keys are involved, increasing the attack surface.
AI Perspectives: ChatGPT and Grok Weigh In
CCN consulted two advanced AI chatbots—ChatGPT and Elon Musk’s Grok—to explore the seriousness of this looming threat.
ChatGPT offered a cautious outlook:
“Quantum computing poses a real and time-sensitive challenge for blockchains built on elliptic-curve cryptography, including Bitcoin and Ethereum. While the exact timeline is uncertain, a breakthrough before 2028 is not unrealistic.” It emphasized that the danger isn’t from a sudden leap in quantum power but from delayed or uneven migration to quantum-resistant cryptography. ChatGPT highlighted Ethereum’s inherent advantage due to its protocol upgradeability, though social and technical coordination remains a hurdle. Bitcoin’s decentralized governance, meanwhile, poses a challenge to speedy upgrades.
Grok’s take was more blunt and sardonic:
“If quantum computers get good enough to break ECC by 2028, the entire internet has bigger problems than crypto — banks, passwords, government data — all toast." While mocking repeated cries of “quantum apocalypse,” Grok acknowledged that Buterin’s concerns aren’t baseless. “Ethereum can patch itself. Bitcoin? Good luck convincing everyone to upgrade.” Grok stressed that any quantum-induced collapse wouldn’t be instantaneous but would begin with vulnerable points like old wallets and sloppy exchanges.
Industry Voices Call for Urgent Action
Organizations like OneSafe and Deloitte echo the call for immediate preparations. OneSafe’s recent blog stressed that Buterin’s warnings reflect a realistic interpretation of current quantum research roadmaps rather than alarmist speculation. It noted that payroll and enterprise systems integrating crypto add further vulnerabilities as repeated wallet address use expands quantum attack surfaces.
“Quantum computing’s threat to blockchain security requires urgent action,” OneSafe urged, emphasizing the importance of developing and integrating quantum-resistant cryptographic techniques into blockchain protocols and peripheral systems.
What’s Next for Cryptos?
The race is now on between quantum computing advancements and the crypto community’s ability to upgrade and adapt:
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For Ethereum: The platform’s relatively flexible upgrade mechanisms may enable it to transition to quantum-resistant algorithms more smoothly, despite social coordination challenges.
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For Bitcoin: Its conservative and decentralized decision-making structure could slow this necessary evolution, potentially leaving it more exposed in the near term.
Conclusion
Quantum computing indeed represents a consequential risk to current cryptographic standards securing the world’s largest blockchains. Experts like Vitalik Buterin and Scott Aaronson warn that fault-tolerant quantum machines capable of cracking ECC could arrive before 2028, potentially jeopardizing Ethereum and Bitcoin’s security.
While immediate collapse is unlikely, risky wallets and exchanges could be compromised first, gradually eroding trust and security. The evolving situation demands accelerated research, development, and consensus-driven upgrades to quantum-resistant protocols to safeguard the decentralized future.
About the Author
Kurt Robson is a London-based reporter at CCN specializing in cryptocurrency and emerging technologies. With a background in journalism and a passion for innovation, he delivers insightful, people-focused coverage on blockchain, AI, and the digital landscape.
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