As quantum computing moves closer to practical reality, the crypto industry is beginning to confront a question it has long put off: what happens if the crypto that underpins trillions of dollars in digital assets no longer holds up?
The responses, so far, are anything but uniform.
In many of the best-known ecosystems, such as Bitcoin, Ethereum and Solana, the answers diverge along familiar lines: what to do with social consensus and technical iteration, and community members are divided between caution and acceleration.
Quantum computing is a fundamentally different computing approach that uses the principles of quantum mechanics instead of classical physics. Instead of traditional bits that are 0 or 1, 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 certain complex problems much more efficiently than classical computers, particularly tasks like factoring large numbers that underpin modern encryption.
How threatening is quantum computing? Consider this: Quantum computers can solve extremely complex problems in seconds, while ‘supercomputers’, the most powerful computing machines available today, would take thousands of years to solve the same problems, according to IBM.
And that’s why threats to crypto networks arising from quantum computing are worrying. 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.
While 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 remove bitcoin from their portfolios entirely due to the imminent risk to the network. While this has struck a chord with some investors, others, including Cathie Wood’s Ark Invest, came to the defense of Bitcoin, saying that quantum computing is a long-term risk, but a risk nonetheless.
For years, these discussions remained largely academic, but as Taproot went live in 2021 and quantum research continued to advance, attention turned to practical questions: how to migrate funds, how to handle vulnerable currencies, and whether upgrades could be introduced without breaking Bitcoin’s core guarantees. More recently, this abstract concern has begun to crystallize into concrete proposals.
Developers are now focusing on a basic question: Some older bitcoins could be easier to crack if quantum computers improve. One proposal, called BIP360, aims to help users move those coins to more secure addresses over time, rather than forcing a sudden change across the network. At the same time, more experimental ideas are being discussed. One, known as “Hourglass,” would gradually limit the use of vulnerable coins unless they are moved, giving owners time to act and reducing the risk of theft. While some estimates say millions of bitcoins (including around 1 million tied 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 is making drastic changes that go against Bitcoin’s fundamentals.
That tension underscores a deeper challenge: any solution must navigate Bitcoin’s core ethos of immutability and minimal intervention. As a result, Bitcoin’s quantum strategy is emerging not as a single roadmap, but as a spectrum of proposals whose fate will depend less on technical feasibility than on whether the community can 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
If Bitcoin is still debating “whether” to act, Ethereum and the ecosystem around it have largely moved on to the “how.”
Throughout 2025, the Ethereum Foundation 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. The change reflects a growing sense among leading developers that timelines may be compressing and that preparation cannot wait for definitive breakthroughs in quantum hardware.
The Ethereum roadmap is not about a single upgrade, but rather a gradual transition. Research has focused on integrating post-quantum signature schemes into future iterations of the protocol, along with broader architectural changes such as LeanVM, which aim to make the system more adaptable to new cryptographic primitives. Rather than forcing an abrupt migration, the goal is to create options: allowing developers and users to adopt quantum-resistant tools incrementally, without breaking compatibility with existing infrastructure.
That same philosophy is visible in some of the largest crypto companies. Coinbase, one of the largest crypto exchanges in the US, recently established an independent advisory board made up of cryptographers, academics, and quantum computing experts. The group is tasked with assessing risks, guiding deployment strategies, and ensuring defenses evolve alongside the threat landscape. The move indicates that quantum readiness is no longer limited to protocol developers: it is also becoming a commercial and operational concern.
Ethereum Layer 2 networks are also starting to chart their own paths. Optimism, a major Ethereum scaling solution, has outlined the first ideas about post-quantum upgrades. While still in a conceptual stage, the effort underscores a broader trend: Instead of waiting for a single solution for the entire ecosystem, different layers of the stack are starting to experiment in parallel.
Taken together, Ethereum’s approach has recognized that quantum risk is real, but that the transition must be carefully managed to avoid introducing new vulnerabilities.
Solana’s silent turn
Solana, on the other hand, has taken 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 option to store assets in smart contract-based vaults protected by unique hash-based signatures, an approach widely considered more resistant to quantum attacks.
Unlike a protocol-level patch, these vaults function as an additional layer of security. Users who are concerned about long-term quantum risk can opt-in, while the broader network continues to operate unchanged. For now, Project Once will lead the charge to advance Solana’s post-quantum security.
Initial reaction from the Solana community has been largely positive, with developers and users welcoming the experimentation. Still, quantum computing has not emerged as a sustained flashpoint in ecosystem discourse, and the discussion remains relatively subdued compared to the more urgent debates playing out elsewhere.
This divergence in approaches highlights a deeper truth about the crypto industry: there is still no consensus on how urgent the quantum threat really is. Some argue that practical attacks are still years away or 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 a shift from abstract concern to active planning. Even in Bitcoin, where switching is more difficult, the mere fact that a coin freeze is being discussed indicates how far the conversation has advanced.
For now, the industry’s response looks more like an early stress test than a coordinated defense.
Read more: Quantum threat becomes real: Ethereum Foundation prioritizes security with leanVM and PQ signatures
