The Ethereum Foundation is developing leanVM to gather post-quantum validator signatures into compact proofs, addressing the extra network data that could accompany a change in how validators authenticate their votes.
Ethereum validators currently use BLS signatures to approve messages that help the network reach agreement. The foundation is developing leanXMSS as a hash-based alternative intended to resist future quantum attacks. Hash-based attestations lack BLS’s built-in aggregation, so leanVM is being developed to prove their validity in batches.
leanVM is designed to aggregate those signatures into proofs that validators can check. That would shift some of the computational work away from routine verification, though producing the proofs would require more capable hardware.
Under draft Ethereum Improvement Proposal 8292, nodes with sufficient computing capacity could volunteer to generate proofs. Other validators would verify them. The proposal warns that proof generation could become concentrated among better-equipped operators, even if verification remains accessible to nodes with less powerful hardware.
Ethereum’s quantum research spans execution, consensus and data. Community processes will determine any eventual protocol changes.
The schedule remains under revision. EF Architecture's living Strawmap change log records a Nov. 2 move of leanXMSS post-quantum attestations from milestone K* to J*. The change concerns attestations and does not set a deployment date for leanVM.
The leanVM project says end-to-end formal verification is in progress and the system is not ready for production. The foundation has scheduled a reassessment of quantum computing progress for January 2027.
