Stocks & Crypto › Quantum Resistant Ledger
Quantum-resistant crypto
QRL is a blockchain that has signed every transaction with post-quantum signatures since its launch in 2018.
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The Quantum Resistant Ledger (QRL) is a blockchain that has run since June 2018. It signs every transaction with XMSS, a hash-based signature scheme, instead of the elliptic-curve signatures that Bitcoin and Ethereum use (QRL).
XMSS is specified in RFC 8391 (2018) and approved by NIST in SP 800-208. The team names the trade-offs itself: larger signatures and stateful key management, meaning a wallet has to keep track of which one-time keys it has already used (QRL).
A large enough quantum computer running Shor's algorithm could work out private keys from the elliptic-curve public keys that Bitcoin and Ethereum rely on (how Bitcoin is exposed). QRL addresses do not use elliptic curves, so that attack does not apply to them.
QRL 2.0 (Project Zond) is meant to move the network to proof-of-stake with ML-DSA-87, a post-quantum signature that NIST standardised in FIPS 204, and to add smart contracts that work like Ethereum's. In June 2026 the team said half of the security audits were done and that the launch depends on finishing them (QRL).
Quantum resistance is one property of a network. It says nothing about adoption, liquidity or price risk.
This page explains what the company or project does and how it relates to Q-Day. It is not investment advice. Last checked 9 October 2026. Every fact on this page links to its source.
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