leanXMSS
An Ethereum research variant of XMSS designed for validator signatures that can be aggregated efficiently. It is in devnet testing and is not covered by a published standard.
- Quantum status
- Believed quantum-resistant
- Standard
- No published standard
- Family
- hash based stateful
- Also known as
- lean signatures
Rated chains using it
- Ethereum Testnet
Validator consensus. Versioned interoperability devnets; pq-devnet-1 to pq-devnet-3 completed by March 2026. Statement or write-up
- Tezos Testnet
Validator consensus. Hash-based XMSS attestations with STARK aggregation from the LeanEthereum project, on Quantumnet and not on mainnet. Statement or write-up
Sources
- Post-quantum Ethereum , Ethereum Foundation. Accessed 19 October 2026.
Published beside the Hardy Score and not an input to it. How each chain is scored is set out in the methodology.