Vitalik Buterin has unveiled a hybrid architecture that combines zero-knowledge proofs, optimistic rollups, and trusted execution environments (TEEs) to improve Ethereum's scalability and security.
In an Ethereum forum, Vitalik Buterin, co-founder of the blockchain, recently presented an ambitious roadmap to improve the scalability and security of Layer 2 rollups and, thereby, optimize the main network.
In the paper, Buterin proposed a hybrid architecture that integrates zero-knowledge proofs (ZK), optimistic rollups (OP), and trusted execution environments (TEE), taking a new and innovative approach to solving two of the most significant challenges facing the Ethereum blockchain: the need for a faster finality and a greater confidence in transactions of Layer 2.
BUY ETHEREUMButerin's proposal comes at a key moment for the Ethereum ecosystem, where L2 rollups are maturing rapidly.
With upcoming updates, such as Pectra and Fusaka in the near future, the data blob space is expected to expand significantly, enabling greater transaction efficiency. However, the security and finality of these transactions remain critical challenges. Therefore, Buterin believes that a hybrid architecture could offer a balanced path to overcome these obstacles, combining the strengths of different technologies to create a more robust and scalable system.
Hybrid Architecture: A Balanced Approach to Scalability
The architecture proposed by Buterin combines three key components, mentioned initially, which are the zero-knowledge (ZK) proofs, optimistic rollups (OP) and trusted execution environments (TEE)By combining these innovations, Buterin seeks to take a new approach to achieving faster finality and greater confidence in L2 rollups.
BUY OPTIMISM“Today, the state of L2 security and L2 finality guarantees is improving: we now have three rollups in Phase 1, we’re on the verge of rollups getting more blob space with Pectra and then even more with Fusaka, and we have more and more high-quality ZK-EVM options that would enable much shorter finality times. Where can we go from here?”Buterin commented.
According to Valid identity document Presented, the system works as follows: if a state root is validated by both a ZK prover and a TEE prover, the transaction is immediately finalized. If only one of the two provers approves the root, the system falls back to an optimistic model, requiring a seven-day challenge period to confirm the transaction. This design avoids over-reliance on a single system, thereby reducing the risks of shared vulnerabilities.
“I maintain that the best near-term test system architecture for EVM rollups to reach Phase 2 is a 2-for-3 between optimistic, ZK, and TEE-based provers,” Buterin said.
Furthermore, the hybrid architecture incorporates a safety board that can intervene in the event of critical failures. This board has the ability to immediately update the TEE logic and, after a delay period, modify the ZK or OP systems. This additional layer of security ensures that the system can quickly recover from errors without compromising its integrity.
TRADE WITH STABLECOINSThe Road to Ethereum Stage 2
Buterin's proposal focuses on bringing Layer 2 rollups to Stage 2 of Ethereum's scaling plan. At this stage, rollups must demonstrate greater trustlessness and faster finality. To achieve this, work is being done on two fronts: increasing blob space and improving proof systems.
With the Pectra upgrade, expected in the coming weeks, blob space will increase to six units per block. Subsequently, the Fusaka upgrade could expand this number to 72, which would represent a quantum leap in transaction processing capacity. This increase will allow rollups to operate more efficiently, reducing congestion and transaction costs.
In addition, Buterin highlights the importance of developing a standardized proof aggregation layer for the entire Ethereum ecosystem. Currently, every application that uses zero-knowledge proofs, such as rollups and privacy protocols, must submit its own proofs, resulting in significant overhead. Natural gasHowever, a shared aggregation layer would allow testing of multiple applications to be combined into a single one, dramatically reducing costs and improving overall system efficiency.
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The importance of evidence aggregation
Proof aggregation is a key component of Buterin's vision for Ethereum. By allowing multiple applications to share the cost of zero-knowledge proofs, it reduces the burden on the network and facilitates the use of technologies like ZK-EVMs. This approach, according to Buterin, would benefit not only rollups but also other projects within the ecosystem, such as privacy protocols and wallet recovery tools.
INVITE AND WIN“This allows N applications to pay the ~500.000 gas cost for testing once, instead of N times,” stressed.
Buterin also points out that advancements in ZK-EVM verification are critical to eliminating trusted execution environments (TEEs) in the long term. As these technologies mature and critical bugs are reduced, rollups will be able to operate in a completely decentralized and trustless manner, achieving instant finality and greater scalability.
A step forward in improving and optimizing Ethereum
Vitalik Buterin's proposal represents a significant step forward on the path to a more scalable and secure Ethereum network. By combining zero-knowledge proofs, optimistic rollups, and trusted execution environments, this hybrid architecture offers a practical balance between speed, security, and decentralization.
Additionally, with upgrades like Pectra and Fusaka on the horizon, the Ethereum ecosystem is better positioned than ever to address scalability challenges.
BUY ETHEREUMWhile this plan is still in development, its implementation could mark a milestone in Ethereum's history, bringing the network closer to its vision of being a more accessible, efficient, and resilient blockchain platform for millions of users around the world.
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