Tezos launches Quantumnet, the first experimental post-quantum testnet, tackling blockchain security in a quantum computing world.

Tezos (XTZ) has launched Quantumnet, its first experimental post-quantum testnet, marking a significant step in preparing the blockchain for the future of quantum computing. Developed by Nomadic Labs, Trilitech, and other contributors, Quantumnet integrates key components necessary for a quantum-resistant Layer 1 blockchain into one environment. This initiative reflects the growing urgency among blockchain projects to address potential vulnerabilities posed by quantum computing advances.

Quantumnet's scope goes beyond introducing new account types. The testnet reimagines core blockchain functionalities—such as consensus, baking rights, and data availability—by incorporating post-quantum cryptographic systems. For instance, it replaces the elliptic-curve signatures currently used for transactions with ML-DSA-44, a signature scheme recently standardized by the U.S. National Institute of Standards and Technology. It also introduces hash-based XMSS signatures for consensus and ZODA, a quantum-resistant data availability solution.

This launch follows Tezos' Ushuaia upgrade in June 2026, which first introduced tz5 accounts capable of post-quantum cryptographic signatures. Quantumnet now builds on that foundation by activating tz5 accounts in a live testnet while expanding post-quantum capabilities to critical protocol layers. The testnet is designed as an "engineering playground," offering developers and bakers a platform to experiment and evaluate these technologies.

Although no quantum computer today can break public-key cryptography, recent advancements have accelerated timelines for such capabilities. Google, for example, has set 2029 as its deadline to migrate to post-quantum cryptography. Quantum error correction has also improved, and the resources needed to compromise elliptic-curve cryptography have decreased.

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