SHRINCS Draft Targets Smaller Post-Quantum BTC Signatures: Is Bitcoin Now Quantum Proof?

In Bitcoin news today, a group of cryptography researchers has published a draft specification for SHRINCS, a post-quantum signature scheme for Bitcoin transaction authorization.

The draft, authored by conduition, Ethan Heilman, Mikhail Kudinov, Oleksandr Kurbatov, Jonas Nick, and a contributor known as remix7531, describes a hash-based design that combines a compact stateful signing path with a stateless fallback.

Bitcoin’s Quantum Defense Takes a Major Step Forward Adam Back's Blockstream has published a Bitcoin Improvement Proposal for its experimental SHRINCS signature scheme. The proposal targets a major future threat from sufficiently powerful quantum computers.

SHRINCS has already… pic.twitter.com/xGIowGaQzX — BSCN (@BSCNews) August 27, 2026 Signature size is particularly important for Bitcoin because signatures consume scarce block space.