Executives from nine blockchain organizations have launched the Quantum Alliance, an open standards body created to settle one of the industry’s murkiest questions: what it actually means for a blockchain network to be safe from quantum computers. The group’s mandate is to define what “quantum-ready” means and to establish a common way to test and verify quantum-resistance claims across networks, wallets and infrastructure.

Announced Thursday, the Alliance will set criteria for judging quantum-resistance claims and create compatibility rules for networks as they migrate to new cryptography. Its founding contributors span base-layer protocols, privacy networks, rollups (scaling networks that settle transactions to a base chain), hardware wallets and security auditing, including Quantus, Postquant Labs, Midnight Foundation, Keystone, Abelian and security firm Hacken.

Modeled on the Internet Engineering Task Force, the volunteer-driven body that has long steered core internet standards, the group said proposals will advance on public evidence and working implementations rather than corporate size or token holdings, and that everything it produces will be published openly.

The Alliance’s work will run through four groups focused on blockchain migration, post-quantum zero-knowledge systems, wallet security and cross-chain compatibility — covering everything from large-scale network migrations to wallet-level protections.

“In the future, ‘post-quantum cryptography’ will just be called ‘cryptography’ and everything else will be in a museum,” said Quantus founder and CEO Christopher Smith.

The problem the new body is tackling is that there is currently no agreed definition of “quantum-ready” and no standard way to test one. A network can call itself quantum-resistant today with no shared understanding of what the claim covers or what evidence should back it — a gap the Alliance was formed to close. The wider security industry has a head start: the U.S. National Institute of Standards and Technology finalized its first post-quantum cryptography standards in August 2024, giving conventional software vendors a common yardstick. Blockchain networks have no equivalent benchmark yet, and upgrading a live chain is not a routine patch — it means coordinating independent node operators, wallet makers and application developers at once.

The stakes are familiar to anyone following the beat. Nearly every major blockchain secures accounts with elliptic-curve signatures — the public-key cryptography that has protected Bitcoin since its 2009 launch — and once an account’s public key is exposed on the ledger, a sufficiently powerful quantum computer running Shor’s algorithm, the 1994 quantum method for breaking the math behind those signatures, could theoretically reverse-engineer the private key and seize the funds.

The same cryptography also guards stablecoin minting keys, bridges (tools for moving assets between chains), oracles (services that feed external data into smart contracts) and governance contracts, meaning a single cracked privileged key could cascade across platforms. By the Alliance’s count, roughly 6.04 million BTC — about 30% of Bitcoin’s supply — sit quantum-exposed at rest, meaning coins held in addresses whose public keys are already visible on the ledger.

The timelines keep tightening. The Quantum Alliance cites a cluster of recent forecasts pointing toward the late 2020s, including a model co-built by two of its own contributors that flags March 2028 as an early window, and a Google Quantum AI study that slashed the estimated number of qubits needed to break Bitcoin’s cryptography to under 500,000 — a drastic reduction from earlier estimates.

No machine can do it yet. Google has also chipped away at key quantum bottlenecks, while figures like famed investor Kevin O’Leary have flagged the quantum threat as a catch hanging over Bitcoin’s long-term case.

The newly formed Alliance joins a widening industry scramble to address the risk. Coinbase recently urged Bitcoin developers to start the quantum migration now, suggesting preparations could take years — timelines that brush up against forecasts landing later this decade. Meanwhile, a consortium backed by BlackRock, Strategy and Coinbase has committed $15 million to the problem. Because the Alliance publishes everything openly, its first draft criteria and reference implementations — products of the four working groups — will be the earliest tangible markers of whether “quantum-ready” hardens into a measurable, testable claim rather than a marketing label.