---
title: "LM-OTS: which blockchains use it"
url: "https://hardyindex.com/algorithms/lm-ots"
---

# LM-OTS

The one-time signature scheme underlying Leighton-Micali Signatures, specified in RFC 8554. NIST SP 800-208 approves the full LMS construction built on it. Each key signs once.

- **Quantum status:** Believed quantum-resistant. No post-quantum scheme carries a proof of resistance.
- **Standard:** RFC 8554 (IETF, final).
- **Family:** hash based one time.
- **Also known as:** Leighton-Micali one-time signatures, LMS.

## Rated chains using it

- [Bitcoin Cash](https://hardyindex.com/chains/bitcoin-cash.md): contract level, mainnet, opt-in. Quantumroot vaults verify LM-OTS inside Bitcoin Script. Source (statement or write-up): https://blog.bitjson.com/quantumroot/

## Sources

- [RFC 8554: Leighton-Micali Hash-Based Signatures](https://datatracker.ietf.org/doc/html/rfc8554), IETF. Accessed 19 October 2026.