The Ethereum Economic Zone (EEZ) has announced three new demonstrations involving CoW Swap, Safe, and post-quantum signatures, showcasing how applications on Ethereum rollups can interact directly with the mainnet in a single transaction.
- EEZ announced three technical demos at Devcon, involving CoW Swap, Safe, and post-quantum signatures, with transactions coordinated between Ethereum mainnet and rollups.
- CoW Swap demonstrates how users on a rollup can execute trades using Ethereum mainnet liquidity and receive tokens in the same transaction, without requiring separate bridging or additional signatures.
- Safe demonstrated coordinated wallet ownership changes and vault access across Ethereum networks, enabling account permissions to be updated and verified in a single transaction.
After developers validated Falcon post-quantum signatures on a rollup and used the verification results to authorize mainnet transfers, the team said this reduced gas consumption by 91%.
The EEZ team stated in their November 4 announcement that these advancements represent the first three instances of synchronized composability between Ethereum's base layer and its rollups, with live demos scheduled at Devcon in Mumbai.
These demos cover a decentralized exchange trade using mainnet liquidity, a multisig wallet ownership change coordinated across networks, and reauthorizing a mainnet transfer after verifying post-quantum signatures on a rollup.
Developers Friederike Ernst and Eduardo Antuña Díez plan to demonstrate this technology on Lotus Stage 1 at 1:00 PM IST, allowing the live audience to see these transactions run in real time.
The Ethereum Economic Zone enables rollup transactions to access mainnet liquidity.
The first demo involves CoW Swap: a user on a network called Rollup X signs an order that is matched using liquidity available on the Ethereum mainnet.
The EEZ team stated that the CoW Solver executed this trade using mainnet liquidity, and the tokens were ultimately returned to the rollup in the same transaction.
This process requires no separate bridging transaction, waiting period, or additional user signature.
Typically, when users transfer assets between Ethereum and its Layer 2 networks, they must first interact with bridge infrastructure to access liquidity on the other chain. Depending on the bridge and network, completing the transfer may involve separate transactions and confirmation periods.
EEZ's approach enables coordinated execution across connected networks, ensuring that different parts of a transaction either all succeed or all fail together.
Developers say this helps newly launched rollups access existing Ethereum liquidity without fully relying on their own transaction pools, as limited liquidity could lead to higher slippage for users.
This demo builds on an early milestone from October, when the project completed its first atomic mainnet transaction involving 0.001 ETH.
As previously reported by crypto.news, the transaction coordinated a transfer and state update between Ethereum and a rollup, establishing an early working example of the framework’s cross-chain execution model.
Safe demonstrates cross-chain coordination for wallet ownership change
The second demo focuses on Safe, a multi-signature wallet infrastructure commonly used by decentralized autonomous organizations and cryptocurrency treasury managers.
EEZ stated that developers demonstrated the first atomic ownership transfer between Ethereum Layer 1 and Layer 2, as well as access to treasury assets held across multiple Safe accounts.
In the example, users can coordinate execution to update wallet ownership and access vault funds across different networks.
The team explained that ownership changes to Safe accounts on the Ethereum mainnet can be read and verified by connected rollups within the same transaction.
This coordination addresses issues that may arise when an organization maintains separate Safe accounts across multiple blockchains.
Changes to authorized signers or wallet permissions typically need to be performed separately on each network, which may cause account configurations to be temporarily out of sync.
This demo shows how the EEZ framework coordinates these updates across participating chains without requiring users to complete ownership management processes separately on each chain.
Post-quantum signature verification saves 91% in gas.
The third demo involves post-quantum cryptography: a developer verified a Falcon signature on Rollup X and used the verification result to authorize a transaction on the Ethereum mainnet.
According to EEZ, a mainnet smart contract invoked a rollup, checked the signature verification result, and authorized the transfer within the same transaction.
Falcon is a digital signature algorithm designed to resist attacks from quantum computers, which may eventually threaten certain cryptographic methods used in blockchain systems.
The team stated that executing verification directly on the Ethereum mainnet would require approximately 5.5 million gas.
By offloading computation to a rollup and having the mainnet use the verified results, this demo achieves a claimed 91% reduction in gas consumption.
This example involves the verification of post-quantum signatures and their use in transaction authorization, not the replacement of Ethereum’s existing signature system.
Developers view this result as another use case for synchronous composability, particularly suited for computationally intensive operations that can be handled outside the base layer but still require access to mainnet contracts.
EEZ development progresses toward Gnosis Chain integration
These demos are a continuation of months of development work following the launch of the Ethereum Economic Zone by Gnosis, Zisk, and the Ethereum Foundation at EthCC in April.
This framework aims to address liquidity and application fragmentation in Ethereum's growing ecosystem of Layer 2 networks, while enabling participating chains to settle transactions on Ethereum.
Its development has since become part of the Gnosis Chain plan to transition into an Ethereum rollup.
In August, GnosisDAO approved this transition through governance proposal GIP 153, which received support from 123,158 GNO and met the required participation threshold.
According to the approved plan, Gnosis Chain will eventually retire its existing validator set and use Ethereum for settlement and economic security.
This transition is expected to preserve existing applications, account balances, contract addresses, and chain identifiers, with an initial deployment targeted for late 2026 or early 2027, depending on technical readiness.
Meanwhile, Consensys launched its institutional interoperability platform at Devcon and plans to support the EEZ standard in future integrations.
EEZ developers have provided technical demonstrations via build.eez.io and eez.dev, and invite developers to try this experimental network at the project’s Devcon booth or remotely.