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Ethereum Launches Post-Quantum Roadmap With 2029 Upgrade Target

The public plan moves years of research into a coordinated build that aims to keep home validators viable under larger signatures.

Ethereum outlines multi-year plan to transition to quantum-safe cryptography
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Overview

  • The new pq.ethereum.org portal, launched Tuesday, brings the roadmap, technical papers, institutional FAQs, and sign-ups for an October 2026 research retreat into one place.
  • Researchers propose LeanSig, a hash-based signature, paired with Lean Multisig, a STARK-based proof system that compresses many big signatures into about 125 kilobytes by proving they were checked correctly.
  • The approach addresses a core risk where post-quantum signatures are about 3,000 bytes each and naïve aggregation could push roughly 30 megabytes of data per slot, which would raise bandwidth needs and drive out home validators.
  • Testing is already underway with 10 client teams and four devnets shipped, with experiments built around three-slot finality and four-second slots to gauge performance under the new cryptography.
  • The roadmap targets key components for inclusion in an L or M fork around 2029 and cites outside estimates that a quantum computer able to break current crypto could arrive near 2032, while coverage varied as Bitcoinist highlighted compression math and devnets, AMBCrypto stressed the multi-layer shift, and CoinCentral focused on zero-knowledge techniques and wallet protection.