Metis Launches Hybrid Rollup on Devnet With Validity Proofs

Metis launched its Hybrid Rollup on a developer network on Nov. 11, pairing validity proofs with its existing optimistic rollup architecture as it prepares a staged transition toward post-quantum cryptography.

The upgrade combines optimistic challenges with validity proofs generated by Ziren, an open-source zero-knowledge virtual machine developed by the ZKM project. It also adds support for ML-DSA post-quantum signatures to Metis' decentralized sequencer, known as DSeq. The design verifies execution results on-chain, and Metis first proposed the Hybrid Rollup in March 2023 with a stated goal of cutting a seven-day withdrawal period down to hours.

That withdrawal target sits at the center of the business case. Optimistic rollups inherit long challenge windows because fraud proofs need time to surface. Hybrid designs let validity proofs settle execution quickly, while the optimistic challenge path remains as a backstop. For applications built on Metis, faster finality changes treasury operations, trading infrastructure and cross-chain flows that currently wait out the seven-day window.

What shipped on Nov. 11?

The Devnet release is a working codebase, not a marketing paper. It supports two cryptographic paths: elliptic-curve cryptography (ECC) and post-quantum cryptography (PQC). Only ECC is enabled at launch, and the modular design lets individual components shift from ECC to PQC over time rather than forcing a single cutover.

That detail matters operationally. A component-by-component migration path reduces the coordination burden on sequencer operators, validators and tooling vendors. It also gives Metis a hedge: if post-quantum standards tighten or shift, the architecture can absorb changes without a full rewrite.

The ML-DSA signature support is the concrete post-quantum element in this release. ML-DSA is the lattice-based digital signature standard derived from Dilithium, and wiring it into DSeq signals that Metis treats quantum-resistance as sequencer infrastructure, not a future add-on. DSeq, Metis' decentralized sequencer pool, is the operational layer where block production and ordering happen, so signature migration there is a prerequisite for any broader PQC rollout.

What does this change for developers?

For now, nothing on mainnet. The Nov. 11 launch lives on a devnet, and ECC-only mode means teams can test the hybrid proof flow without touching post-quantum code paths. Developers building on Metis can begin integrating against a codebase that behaves the way the production network eventually will: optimistic challenges available, validity proofs settling execution on-chain.

The Ziren component deserves attention on its own. Ziren is open source, developed by the ZKM project, and its role here is to produce the zero-knowledge proofs that verify execution. An open-source proving stack lowers the barrier for other rollups to adopt similar hybrid designs, which could pressure closed-source proving systems across the layer-2 market.

What comes next?

Metis plans a testnet launch in the first quarter of 2027. That milestone will demonstrate both verification paths, ECC and PQC, running in the upgraded rollup architecture. It is the first date on the calendar where the post-quantum claims become publicly testable rather than architectural intent.

Between now and then, the devnet period functions as an integration window. Sequencer operators, wallet providers and bridge developers have roughly two years to prepare for a network that settles fast and signs differently. The testnet debut in Q1 2027 is the checkpoint to watch for whether the hybrid-plus-PQC roadmap stays on schedule.