As quantum computing moves closer to practical reality, the crypto industry is beginning to face a question it has long put off: What will happen if the cryptography that underpins trillions of dollars of digital assets no longer holds up?
So far, the responses have been anything but uniform.
In many of the best-known ecosystems like Bitcoin, Ethereum, and Solana, answers diverge along familiar lines: what to do about social consensus and technical iteration, and community members are torn between caution and acceleration.
Quantum computing is a fundamentally different approach to computing that uses the principles of quantum mechanics rather than classical physics. Instead of traditional 0 or 1 bits, quantum computers use “qubits,” which can exist in multiple states at once, a property known as superposition, which allows them to process many possibilities simultaneously.
Combined with another feature called entanglement, this allows quantum machines to solve some complex problems much more efficiently than classical computers, particularly tasks such as factoring large numbers that underpin modern encryption.
How threatening is quantum computing? Consider this: Quantum computers can solve extremely complex problems in seconds, whereas “supercomputers,” the most powerful computing machines available today, would take thousands of years to solve the same problems, according to IBM.
This is why the threats that quantum computing poses to crypto networks are concerning. And even Google, developer of Willow, a quantum supercomputer, is setting a deadline of 2029 to migrate its authentication services to post-quantum cryptography, citing advances in the technology.
Fierce debate over Bitcoin
Nowhere is the tension more visible than in Bitcoin.
Although the risks posed by quantum computing have been understood since the early days of the network, the debate began significantly a few years ago, when developers began to more seriously discuss post-quantum signature schemes and the long-term implications of exposed public keys.
The threat became very real recently, when some Wall Street analysts, such as Jefferies, said investors should abandon bitcoin from their portfolios altogether due to the imminent risk to the network. While this has affected some investors, others, including Cathie Wood’s Ark Invest, have come to defend Bitcoin, saying quantum computing is a long-term risk but a risk nonetheless.
For years, these discussions remained largely academic, but as Taproot became active in 2021 and quantum research continued to advance, the focus shifted to practical questions: how to migrate funds, how to manage vulnerable coins, and whether upgrades could be introduced without breaking Bitcoin’s core safeguards. More recently, this abstract concern has begun to crystallize into concrete proposals.
Developers are now focusing on a fundamental problem: Some older bitcoins could be easier to break if quantum computers improve. One proposal, called BIP360, aims to help users move these coins to more secure addresses over time, rather than forcing a sudden network-wide change. At the same time, more experimental ideas are discussed. One, known as “Hourglass,” would gradually limit the use of vulnerable parts unless they are moved, giving owners time to act while reducing the risk of theft. Although some estimates indicate that millions of bitcoins – including around 1 million linked to Satoshi – could be exposed, not everyone sees this as a major threat. Some argue that the market could absorb it and that the biggest risk would be making drastic changes that go against the fundamentals of Bitcoin.
This tension underscores a deeper challenge: any solution must respect Bitcoin’s core philosophy of immutability and minimal intervention. As a result, Bitcoin’s quantum strategy appears not as a single roadmap, but as a range of proposals whose fate will depend less on technical feasibility and more on the community’s ability to reach consensus without compromising the principles that define the network.
Read more: Bitcoin’s quantum threat is real, but far from an existential crisis, says Galaxy
Ethereum and Coinbase
While Bitcoin is still debating “whether” to act, Ethereum and its surrounding ecosystem have largely moved on to the “how” question.
Throughout 2025, the Ethereum Foundation has quietly ramped up its efforts by creating a dedicated quantum research team and elevating post-quantum security from a theoretical concern to a strategic priority. This change reflects the growing sentiment among key developers that deadlines can be tight and that readiness cannot wait for definitive breakthroughs in quantum hardware.
The Ethereum roadmap is not about a single upgrade, but a gradual transition. The research has focused on integrating post-quantum signature schemes into future iterations of the protocol, alongside broader architectural changes like LeanVM, which aim to make the system more adaptable to new cryptographic primitives. Rather than forcing a hard migration, the goal is to create options: allowing developers and users to gradually adopt quantum-resistant tools, without breaking compatibility with existing infrastructure.
This same philosophy is visible among some of the biggest crypto companies. Coinbase, one of the largest US-based crypto exchanges, recently created an independent advisory board comprised of cryptographers, academics and quantum computing experts. The group is responsible for assessing risks, guiding implementation strategies, and ensuring defenses evolve based on the threat landscape. The move indicates that quantum readiness is no longer limited to protocol developers: it is also becoming a business and operational concern.
Layer 2 Ethereum networks are also beginning to chart their own paths. Optimism, a major Ethereum scaling solution, has outlined early thoughts around post-quantum upgrades. Although still in the conceptual stage, this effort highlights a broader trend: rather than waiting for a single ecosystem-wide solution, different layers of the stack are beginning to experiment in parallel.
Overall, Ethereum’s approach recognized that quantum risk is real, but that the transition must be managed carefully to avoid introducing new vulnerabilities.
Solana’s quiet shift
Solana, on the other hand, took a quieter, more experimental route.
In December 2025, developers in its orbit began introducing the first designs for quantum-resistant tools, including a concept known as the “Winternitz Vault”. The idea is to give users the ability to store assets in smart contract-based vaults secured by unique hash-based signatures – an approach widely seen as more resilient to quantum attacks.
Unlike a protocol-level overhaul, these vaults function as an additional layer of security. Users concerned about long-term quantum risk can opt in, while the broader network continues to operate unchanged. For now, Project Eleven will lead the charge to advance post-quantum security for Solana.
Initial reaction from the Solana community has been generally positive, with developers and users welcoming the experimentation. Yet quantum computing has not emerged as a lasting hot spot in ecosystem discourse, and discussions remain relatively subdued compared to the more pressing debates taking place elsewhere.
This divergence in approaches highlights a deeper truth about the crypto industry: there is no consensus yet on the true urgency of the quantum threat. Some say practical attacks could still be years away, or that they are overblown. Others warn that the transition to quantum-resistant systems could take just as long, meaning preparation must begin well in advance.
What is clear is that the question is no longer hypothetical. The creation of dedicated research teams, advisory boards, and experimental tools marks the shift from abstract concern to active planning. Even in Bitcoin, where change is most difficult, the mere fact that freezing coins is being discussed indicates how far the conversation has evolved.
For now, the industry’s response resembles an initial stress test rather than a coordinated defense.
Read more: Quantum threat becomes real: Ethereum Foundation prioritizes security with LeanVM and PQ signatures
