EU Regulators Sound the Qubit Alarm While Bitcoin Still Has Time to Patch 🧠

Three European Union financial supervisors warned Wednesday that rapid advances in quantum computing could eventually compromise the cryptography underpinning blockchain networks. The European Banking Authority, the European Insurance and Occupational Pensions Authority and the European Securities and Markets Authority issued the warning in a joint risk update, noting that quantum systems could undermine the mechanisms used to secure transactions, communications and stored data across the financial sector.

The supervisory alert follows a more technical reassessment published in March by Google Quantum AI, whose researchers estimated that breaking the cryptography used by many cryptocurrencies could require roughly 20 times fewer physical qubits than earlier projections. A qubit is the basic unit of information in a quantum computer. No machine capable of executing such an attack currently exists.

For cryptocurrency users, the specific risk is that a sufficiently powerful quantum computer could derive a private key from a publicly visible address and use it to sign transactions without authorization. Public keys become visible on certain networks once funds are spent from an address, a window that developers say is one of the more immediate vulnerabilities to address.

Developers across major networks are already weighing countermeasures. Bitcoin developer Jameson Lopp and five co-developers proposed in February a plan to phase out Bitcoin's current signature scheme and restrict how unmigrated funds could be spent once a five-year migration window closes following the proposal's activation. The proposal has not been adopted by the network. The Ethereum Foundation has set a target of December 2029 to make Ethereum resistant to quantum attacks across its execution, consensus and data layers. Separately, StarkWare said it has tested a quantum-resistant Bitcoin transaction on mainnet.

The EBA, EIOPA and ESMA said they will continue to monitor the technology and coordinate with international counterparts on standards for post-quantum cryptography. None of the supervisors named a timeline for when quantum computers might pose a practical threat to blockchain security, and the joint report stopped short of recommending any immediate changes to how crypto assets are regulated.