The alliance working on quantum security for blockchains

The Quantum Alliance wants to give verifiable meaning to an increasingly familiar crypto expression: being ready for quantum computing. In a release dated 16 October 2026, nine organisations announced cooperation on resilience criteria, evaluation methods and migration of blockchain infrastructure. Participants include Quantus, Midnight Foundation, Keystone, Abelian and Hacken, bringing together expertise ranging from protocols to hardware wallets. The announcement describes a shared programme of work.

The alliance identifies four areas: network transition, zero-knowledge proof systems, wallet protection and cross-chain compatibility. It announces open work, testing criteria and implementations intended to compare promises with results. This is a standardisation programme presented by its participants, whose deliverables will need examination when available. The programme's existence and evidence that a particular infrastructure already meets its future criteria are different propositions.

Signatures are central to the question

A blockchain does more than store a list of balances. It applies conditions authorising assets to be spent. Bitcoin's technical documentation, for example, describes transactions whose validity depends on a signature and public key matching previously established conditions. The private key produces that signature without being shared with the network. Authorising a payment and publicly verifying it therefore involve related but distinct information.

The quantum threat concerns mathematical assumptions behind some of these mechanisms. A sufficiently capable computer could make certain signature families vulnerable. This does not mean current devices can already empty every wallet. Predicting when that capability might arrive involves estimates and assumptions about hardware and error correction, rather than a certain calendar. A potential future capability and a demonstrated present attack must be reported separately.

Standards exist, integration remains work

The US NIST finalised its first three post-quantum cryptography standards in August 2024. Two concern digital signatures, named ML-DSA and SLH-DSA; the third, ML-KEM, concerns establishing secrets to protect communications. These functions meet different needs. Choosing a signature standard is consequently not the same as replacing every cryptographic mechanism in a network. The task depends on which component performs which role in the complete system.

NIST encourages organisations to prepare because integration takes time. For a blockchain, our interpretation is that an algorithm announcement needs to be followed by examination of the whole system: validation rules, software, custody tools and service compatibility. A demonstration involving a particular operation does not automatically establish that every account, bridge and application receives the same protection. Claims need to identify their actual technical scope.

How should future announcements be assessed?

A wallet might produce a new signature while its network cannot yet recognise it. Conversely, a protocol might accept a new format before every user has compatible tools. Readiness therefore needs to specify what works, for which accounts and under which conditions. The example illustrates a coordination problem across components, rather than a change that can be established solely by naming an algorithm in a product description.

The useful evidence to follow will be published specifications, reproducible tests and documented limitations. The announced programme aims to make those comparisons possible. It is neither a general security certification nor proof of an imminent quantum attack. The relevant question remains the scope actually protected and how that protection can be checked, while distinguishing work planned by the alliance from capabilities independently demonstrated in operating systems.