Ethereum co-founder Vitalik Buterin has unveiled a plan to address four areas of the network he considers most vulnerable to future quantum computing threats. The roadmap, shared Thursday, targets validator signatures, data storage, user account signatures, and zero-knowledge proofs.
Buterin emphasized that blockchain security must evolve in anticipation of quantum-capable supercomputers, which could potentially compromise traditional cryptography used across Ethereum and other major networks.
Upgrading Validator Signatures
Ethereum currently relies on BLS (Boneh-Lynn-Shacham) signatures for consensus validation. Buterin proposes replacing these with “Lean” quantum-safe hash-based signatures. Selecting the right hash function is critical, as he describes it as potentially “Ethereum’s last hash function.”
Quantum-Safe Data Storage
For Ethereum’s data storage system, or “blobs”, the network uses KZG (Kate-Zaverucha-Goldberg) commitments. Buterin suggests transitioning to STARKs (Zero-Knowledge Scalable Transparent Argument of Knowledge), which are resistant to quantum attacks. While feasible, he notes that extensive engineering work will be required.
User Account Signatures
Ethereum’s user accounts currently use ECDSA (Elliptic Curve Digital Signature Algorithm) signatures, which are not quantum-safe. The plan is to support lattice-based or other quantum-resistant signature schemes, while addressing the computational burden these signatures impose. Buterin highlighted protocol-layer recursive signature and proof aggregation as a solution to reduce gas overheads significantly.
Zero-Knowledge Proofs
Quantum-resistant proofs are particularly resource-intensive. Buterin proposes aggregating proofs at the protocol level, allowing a single validation frame to verify thousands of signatures or proofs at once, reducing costs to near-zero. A block could theoretically hold thousands of validation frames, each containing signatures or proofs ranging from 3kB to 256kB.
Broader Ethereum Development
In the same update, Buterin referenced the Ethereum Foundation’s “Strawmap,” noting expectations for progressive decreases in both slot time and finality time, further improving the network’s efficiency and security.
This roadmap builds on prior research, including Ethereum Foundation researcher Justin Drake’s “Lean Ethereum” proposal from August 2025, and reflects the network’s proactive approach to emerging quantum risks.
Ethereum’s community and developers are now considering the technical and economic trade-offs, particularly around gas costs, as they explore the implementation of these quantum-resistant measures.