Tezos contributors launched Quantumnet on September 24 as an experimental network for evaluating post-quantum changes across the blockchain’s base layer. The project brings several cryptographic components into one testing environment, according to Tezos Spotlight.
The developers explicitly describe it as an engineering testnet, not a system intended for production use. Its launch does not mean that the same changes have already been adopted on Tezos mainnet.
More than a new account signature
Quantumnet enables tz5 accounts using ML-DSA-44 signatures. The announcement explains that support for those accounts was introduced behind a test-network feature flag with the earlier Ushuaia protocol upgrade.
The new network also changes how block-production rights are assigned and how consensus attestations are handled. It replaces the existing randomness-based allocation with Smooth Weighted Round Robin and explores hash-based signatures with STARK aggregation for attestations.
For data availability, the testnet uses ZODA in place of the existing KZG commitments and proofs. These are different parts of the protocol, each with its own performance and implementation questions.
What the experiment is trying to establish
Moving a blockchain toward post-quantum cryptography requires compatible changes across accounts, consensus and supporting infrastructure. Replacing one signature scheme does not resolve every dependency.
A shared test environment gives engineers a way to observe how the components behave together. The announcement says hardware requirements are still being evaluated and notes the limited user experience of the initial release.
The first iteration also omits Sapling and timelock-puzzle features. Those omissions are relevant to assessing the scope of the experiment.
The route to a mainnet change remains ahead
Tezos has an on-chain amendment process through which future protocol proposals can be reviewed and adopted. The announcement presents that process as a possible route for mature components, rather than announcing a final deployment date.
No known quantum computer is described in the release as currently capable of breaking the public-key cryptography widely used by blockchains. The project’s rationale is preparation for an uncertain future capability.
Quantumnet’s immediate contribution is therefore a working place to test engineering choices. Evidence about security analysis, performance and operational requirements will matter more than treating “post-quantum” as a finished property of an entire network.
