As predictions for "Q-Day" approach, experts highlight that the real challenge for crypto lies in its governance, rather than its cryptography, in combating quantum attacks.
By Omkar Godbole, AI Boost|Edited by Shaurya Malwa Jul 27, 2026, 6:37 a.m. 3 min readMake preferred on ShareShare this articleCopy linkX (Twitter)LinkedInFacebookEmailMake preferred on Experts warn that crypto governance lags behind quantum threats. (David Clode/Unsplash)SummaryShow- Quantum computing could first reveal vulnerabilities in cryptocurrency networks, making Bitcoin an early indicator of risks to the wider financial system.
- The slow governance structure of Bitcoin presents a greater challenge than its cryptography in adapting to quantum threats.
- “Q-Day” is anticipated as a gradual risk rather than a singular event, with attackers needing only sufficient quantum capability to compromise encryption.
Quantum computing poses a significant risk to all encrypted systems globally, including major banks, with cryptocurrencies potentially being the first to face such challenges.
"Cryptocurrencies serve as the canary in the coal mine," stated Eddy Zervigon, CEO of Quantum Xchange, in an interview with CoinDesk. His firm specializes in creating protective infrastructure for networks against quantum-enabled threats and identifies crypto as the likely first target.
"The decentralized nature of cryptocurrencies makes them particularly vulnerable," Zervigon explained. "Once attacks begin in this space, it will indicate that a significant quantum computer has been developed somewhere."
Currently, a quantum computer capable of breaching the elliptic-curve cryptography that secures Bitcoin's signatures and the encryption protecting banking transactions does not yet exist. However, the consensus on when such technology will emerge is tightening.
"Major companies investing heavily in quantum computing, like Microsoft and IBM, believe that a commercially viable quantum computer could be operational by around 2029," Zervigon noted, referencing insights from industry leaders like Arvind Krishna of IBM.
This projection aligns with recent advancements in hardware. Earlier this year, Google researchers disclosed that breaking the elliptic-curve cryptography protecting cryptocurrencies like Bitcoin and Ethereum could require fewer than 500,000 physical qubits, a significant reduction from previous estimates, leading to an adjusted Q-Day timeline of 2029.
The U.S. government is also working towards developing a powerful quantum computer by 2028 and plans to transition high-value assets and federal data to post-quantum cryptography by 2030. "This timeline creates urgency,” Zervigon added.
Governance Speed is the Main Concern
Zervigon's perspective is echoed by others who assert that slow governance is the primary vulnerability in crypto.
Deutsche Digital Assets pointed out a clear disparity in governance speed between traditional finance and decentralized systems.
"The key difference — and the honest response to claims that 'Bitcoin is uniquely vulnerable' — is the speed of governance," the bank stated on July 23.
It highlighted that financial institutions like JPMorgan can upgrade their cryptographic systems without needing approval from millions of decentralized participants. Instead, they simply require a board decision, budget, and vendor. “Large institutions can adapt to post-quantum standards more swiftly and discreetly than a decentralized blockchain can,” Deutsche Digital Assets concluded, emphasizing the need to take Bitcoin's governance process into account.
Research, such as a recent 2024 arXiv paper titled "Downtime Required for Bitcoin Quantum-Safety," supports this view, citing Bitcoin's historical upgrade challenges.
"Before any upgrade can be initiated, there must be a 90% consensus among Bitcoin miners regarding the specifics of the upgrade," the researchers noted. "Historically, significant updates to the Bitcoin network have faced substantial opposition, evident in the SegWit upgrade of 2017."
This particular upgrade led to such strong community dissent that it resulted in the Bitcoin blockchain splitting into multiple versions, giving rise to Bitcoin Cash and Bitcoin Gold.
The implication is that while post-quantum cryptography could be ready in time, it remains uncertain whether Bitcoin's governance structure can achieve the necessary consensus to implement these protective measures.
Q-Day Represents a Trend, Not an Event
Markets often perceive this situation as a binary event, where encryption is secure until a specific date, after which it fails. However, Zervigon argues this view is flawed and overlooks the gradual nature of the risk.
"People often discuss the exact moment an algorithm can be broken," he remarked. "It's not necessary for it to happen instantaneously to be a threat. If it takes several months to decrypt valuable data, the objective is still accomplished."
This changes the typical timeline calculations. A quantum computer doesn't need to have real-time capability to break a signature; it merely needs to process enough data before the underlying assets become worthless.