Nori: Ethereum–Mina ZK Bridge on Mina Protocol

Nori is a new project building on Mina Protocol that aims to create a trustless bridge between Ethereum and Mina using zero-knowledge proofs. In simple terms, Nori allows Mina to directly verify Ethereum’s state on-chain with cryptographic proofs instead of relying on centralized bridge operators or multisigs. This interoperability solution leverages Mina’s zk-SNARK-based infrastructure to achieve trust-minimized, secure cross-chain interactions between the Ethereum and Mina blockchains.

Building on Mina’s Zero-Knowledge Infrastructure

Nori uses Mina’s zero-knowledge technology to prove Ethereum’s state inside a Mina zkApp. It works by generating a succinct proof of the Ethereum network’s state and making it compatible with Mina’s proof system. At a high level, here’s how it functions:

• **Zero-Knowledge Verification: Nori runs Helios*, an Ethereum light client, inside a zkVM provided by Succinct Labs. This produces a cryptographic proof of Ethereum’s current state (specifically, a proof of the latest Ethereum state root hash* and block height).
• Proof Conversion: That Ethereum state proof (in PLONK format) is then converted into Mina’s proof format (Kimchi) using O(1) Labs’ o1js framework. This step ensures the Ethereum proof can be verified by Mina’s zkSNARK verifier.
• On-Chain Verification: The converted proof is submitted to a smart contract (zkApp) on Mina, which verifies the proof’s correctness and updates Mina’s record of Ethereum’s state.

Because Mina requires every transaction to include a zk-proof, this on-chain verification fits Mina’s architecture and no third-party trust is needed — Mina itself confirms the Ethereum state proof.

By using this pipeline, Nori achieves an entirely trustless verification of Ethereum within Mina. No custodians or oracles are required, as the validity of Ethereum data is enforced by cryptography.

This approach is a major turning point for zk-applications, as it enables Mina to ingest external blockchain data (like Ethereum’s ledger state) in a succinct proof, opening the door to novel cross-chain use cases powered purely by zero-knowledge proofs.

Role in Mina Ecosystem

Nori’s bridge plays a key role in expanding Mina’s ecosystem by connecting it with Ethereum, the largest smart contract platform. For Mina developers and users, this means assets and data from Ethereum can be brought into Mina in a secure, decentralized manner.

The first use case being developed is the Nori Bridge for ETH: Allowing users to move ETH from Ethereum to Mina without trusted intermediaries. The flow is straightforward on Ethereum, a user deposits ETH into a special smart contract, and on Mina a corresponding zkApp verifies a Merkle proof of that deposit (using Nori’s state proof) to mint wrapped ETH (wETH) on Mina. This gives Mina a trustless representation of ETH that is backed by real Ethereum deposits.

Beyond simple token transfers, Nori unlocks broader cross-chain functionality for Mina. Developers can use it to prove arbitrary Ethereum state or events to Mina, enabling cross-chain DeFi, identity, and dApp integrations.

For example, one could verify an Ethereum NFT ownership or an identity credential on Mina via Nori, or build DeFi protocols that utilize liquidity from Ethereum on Mina without centralized bridges. Some potential applications highlighted include:

• DeFi & Liquidity: Use Nori to transfer or utilize assets across chains with no centralized risk, bringing Ethereum liquidity into Mina’s zkApps.
• Privacy & Identity: Leverage zero-knowledge proofs to prove facts about Ethereum accounts (balances, NFTs, identity attestations) on Mina while preserving privacy.
• Developer Integrations: With the upcoming SDK, wallets and dApps can easily integrate Nori’s verification capabilities, allowing cross-chain functionality (like calling an Ethereum contract state from a Mina application) in a trustless way.

Crucially, Nori’s Ethereum→Mina state bridge complements other efforts in Mina ecosystem to achieve full bidirectional interoperability. While Nori focuses on verifying Ethereum state on Mina, another project called the Aligned Layer (developed by LambdaClass/Geometry) is working on the opposite direction efficiently verifying Mina’s zk-SNARKs on Ethereum.

Mina Foundation notes that the Aligned bridge will allow Mina’s state to be verified on Ethereum, solving Mina→Ethereum proofs. Nori together with the Aligned Layer thus pave the way for a fully trustless, two-way bridge between Ethereum and Mina, with zero-knowledge proofs ensuring security in both directions.

This is a significant development for Mina ecosystem, potentially enabling it to tap into Ethereum’s user base and assets while maintaining Mina’s lightweight, secure protocol.

Team Background and Origins

Nori is being built by a team of Mina community contributors and ZK enthusiasts, with support from Mina ecosystem. The project first emerged in late 2024 as part of Mina’s push for cross-chain interoperability.

In a Mina Foundation update, Nori was mentioned as a new project developing an Ethereum→Mina state bridge, leveraging cutting-edge work on proof conversion (the “o1js blobstream” effort). The initiative was partly inspired by research from Geometry and Nil Foundation on state proofs, but those earlier approaches proved impractical to use directly (Nil’s solution was deemed too expensive). Nori’s team took a fresh approach using the Helios light client and Succinct Labs’ SP1 zkVM to make Ethereum state proofs viable on Mina.

The lead developer of Nori is known by the handle “zkKirol”, who announced the project publicly around January 2025 on social media. Since then, Nori has been highlighted in community channels and Mina’s developer programs. It was cited as an example of the kind of innovative cross-chain application that Mina Navigators Program looks to support.

In fact, Mina Foundation representatives have encouraged similar projects and even suggested reaching out to Nori’s team for those interested in state bridging use cases.

This indicates that while Nori is an independent, community-driven project, it’s operating with visibility and encouragement within the official Mina ecosystem.

The team’s background spans expertise in blockchain interoperability and zero-knowledge proofs, and they are actively collaborating with other ecosystem developers to achieve their goals.

In summary

Nori represents a groundbreaking use of Mina’s zero-knowledge infrastructure to solve a long-standing problem in crypto: secure blockchain bridging. By verifying Ethereum’s entire state with a succinct Mina proof, Nori removes the need for trust in cross-chain transfers. This strengthens Mina ecosystem by linking it to Ethereum’s vast network effects without compromising on decentralization or security.

As development continues, with ongoing optimizations, an upcoming SDK, and collaboration with complementary solutions like Aligned Layer, Nori is poised to become a cornerstone of zk-powered interoperability for Mina. It showcases how Mina’s succinct blockchain can serve as a lightweight “proof hub” for the broader crypto world, allowing different chains to connect through verified proofs instead of trusted middlemen. For the crypto-savvy community, Nori is definitely a project to watch as it brings zero-knowledge applications and cross-chain innovation to the forefront of Mina Protocol ecosystem.

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