Lean Ethereum has reached Devnet5 interop, a major milestone in its effort to make Ethereum's consensus layer quantum-resistant. Ethereum currently uses BLS signatures, which are not post-quantum secure. Lean Ethereum is leveraging quantum-resistant hash-based signatures to address this. The goal is to achieve a PQ signature scheme ready for Ethereum mainnet.

Devnet5 uses leanVM, a ZK-based aggregation layer, to enable entire blocks to carry just one aggregated signature proof instead of many individual signatures. Eight clients are participating in the devnets, with the Lean team progressively scaling validators and subnets to reach production-grade performance.

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