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Ethereum's First Post-Quantum Migration Spec Lands

Camila Russo & Christopher Storaker
June 02, 2026

gm, Defiers!

Ethereum Foundation researchers Thomas Coratger and Justin Drake (author of the EF's post-quantum roadmap) published a draft spec for an XMSS public-key registry, the first piece of protocol plumbing the network would need to migrate validators off BLS signatures (the cryptographic primitive that backs validator attestations, which a sufficiently scaled quantum computer could break). XMSS is hash-based, stateful, and quantum-resistant.

This spec is relevant on its own, but it’s also the third concrete output from inside the EF's narrowed mandate in two weeks. On May 25, Vitalik published a vision cutting the Foundation's scope down to core protocol research, client development, and public-goods funding. The same day, an EF-aligned working group shipped the Kohaku wallet-privacy SDK, a library wallets can integrate for private transactions. Three days later, Vitalik publicly endorsed Interfold, a confidential-governance stack for private voting and sealed-bid auctions. Today's XMSS registry is also the first to land as a fork-level proposal. The argument that a narrower EF would mean less protocol output is being challenged, but markets remain unfazed: $ETH traded in the $1,800s for the first time since February.

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