---
title: "Winternitz one-time signatures: which blockchains use it"
url: "https://hardyindex.com/algorithms/winternitz-ots"
---

# Winternitz one-time signatures

Hash-based one-time signatures in the Winternitz family, in a form other than the standardised WOTS+. Each key signs once, so a design using them has to rotate to a fresh key after every spend.

- **Quantum status:** Believed quantum-resistant. No post-quantum scheme carries a proof of resistance.
- **Standard:** No published standard.
- **Family:** hash based one time.
- **Also known as:** WOTS.

## Rated chains using it

- [Solana](https://hardyindex.com/chains/solana.md): contract level, mainnet, opt-in. Blueshift's Winterwallet program, whose program account we read on mainnet on 21 October 2026. Source (source code or release): https://github.com/blueshift-gg/winterwallet

## Sources

- [Quantum readiness](https://solana.com/news/quantum-readiness), Solana Foundation. Accessed 19 October 2026.