SQRL: A New Settlement System for Money.
Tokenised deposits, instant cross-border payments and in-flight FX, built on Bitcoin and Lightning infrastructure.
- Authors
- Dr Barry Childe, Paul Dando, Alex Holmes, Dominic Obojkovitz and Ashif Asharaph
- Version
- Version 4.1 · 8 November 2026
- Length
- 21 pages, PDF
Abstract
This paper presents the Secure Quantum-Reliable Ledger (SQRL), a framework for lightweight and deterministic computation in open settlement environments. SQRL builds on the Bitcoin transaction model to settle authorisation on Bitcoin for contract deployment and every subsequent call, to introduce deterministic execution contexts, and to provide consensus guarantees with resilience against replay, front-running and data-withholding attacks. It extends naturally to instant off-chain asset transfers over Lightning.
SQRL is the Secure Quantum-Reliable Ledger: the settlement network and contract layer.
