Ethereum co-founder Vitalik Buterin has introduced a new roadmap aimed at strengthening the security and finality of Layer 2 (L2) solutions. His proposal introduces a flexible, multi-proof system designed to support Ethereum’s scalability while preserving its core principles of decentralization and trust minimization. Ethereum’s New Layer 2 Roadmap At the heart of Buterin’s technical framework is a “2-of-3” model. This system uses three different proof types—optimistic, zero-knowledge (ZK), and trusted execution environment (TEE) provers
source: https://beincrypto.com/vitalik-buterin-ethereum-layer-2-model/