Coinbase Releases Draft for Quantum-Resistant Bitcoin
The new SHRINCS specification outlines a strategy to protect Bitcoin signatures against future quantum computing threats.
Updated on Oct. 21, 2026 in Quantum Computing
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Coinbase has introduced a draft specification titled SHRINCS, which aims to secure Bitcoin signatures using quantum-resistant technology. This proposed scheme includes both compact stateful signatures and a stateless fallback option for emergency recovery.
Why it matters
As quantum computing advances, existing cryptographic methods face potential obsolescence, making it critical for major custodians to develop secure signature standards. Coinbase holds roughly 12% of all Bitcoin, giving it significant influence over network security protocols.
The SHRINCS scheme features a 48-byte public key, with stateful signatures ranging from 548 to 4,619 bytes and a stateless fallback measuring 5,777 bytes. The fallback path utilizes a hash-based signature standard derived from SLH-DSA.
The players
Coinbase
This major cryptocurrency exchange and financial services company provides custody and trading solutions for digital assets.
Shashank Agrawal
He is a researcher and contributor who published the technical requirements for the new SHRINCS signature standard.
Brian Armstrong
He is the chief executive officer of Coinbase who has advocated for industry-wide collaboration on digital asset security.
The details
The SHRINCS draft uses sectorization to divide signing space into non-overlapping parts, requiring persistent counter increments before signatures return. The larger stateless signature serves as a necessary safety net when trustworthy state records are unavailable following backup restoration.
Timeline
September 2026: RFC 10033 cataloged approaches for stateful signing management.
October 13, 2026: Shashank Agrawal published the SHRINCS requirement article.
October 20, 2026: Brian Armstrong called for broader industry preparation.
The Tech Race
This move highlights the shift toward preparing blockchain infrastructure for post-quantum cryptography. It builds upon standards established by RFC 10033 to ensure long-term network integrity against future computing paradigms.
Users will not see immediate changes, but the adoption of these standards would influence how assets are stored and secured in the future. The specification requires future deployments to prove reliability through server replacement and data integrity tests.
The takeaway
The development of SHRINCS underscores the necessity for industry-wide proactive measures to secure digital assets. Standardizing these protocols now prevents future forgery risks as quantum computing capabilities mature.
Further reading
Learn more about evolving cybersecurity threats in Quantum Computing.
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Do you trust that new security updates for digital assets will keep your personal funds safe?
