What happened
The SHRINCS project claims to protect Bitcoin from quantum attacks while preserving around three transactions per second, but its readiness remains unconfirmed.
Why it matters
Quantum threats could require changes to cryptographic signatures, and the size of such signatures is directly linked to how many operations fit in a block. SHRINCS offers an option that, according to the project description, takes both constraints into account.
Researchers at Blockstream published the SHRINCS signature scheme draft to protect Bitcoin from quantum attacks. The description also claims preserving throughput at around three transactions per second.
For Bitcoin this ties cryptographic resilience to transaction size: moving to new signatures should not completely displace operations from the block.
The source is presented as an independent recap by Unchained and marked as metadata, not as the full text of the study or confirmation by Blockstream. It is unclear whether the scheme has been tested, what its exact parameters are, or whether its inclusion in the Bitcoin protocol is being discussed.
Confirmed facts
- Blockstream researchers published the SHRINCS signature scheme draft.
- The project is described as aimed at protecting Bitcoin from quantum attacks.
- The project description states that throughput is preserved at about three transactions per second.
- The source reports this in Unchained, published at 28 August 2026 year.
Context
The available evidentiary basis consists of a single independent publication with metadata and a brief summary; the full text of the study is not included in the package.
What remains unknown
- What are the exact sizes and cryptographic parameters of the SHRINCS signatures?
- Has the scheme undergone independent security testing?
- Are there plans by Blockstream or the Bitcoin community to test and implement it?
- How does the claimed throughput of about three transactions per second compare to the network's current capacity?
Editorial context
Confidence: medium
If the project passes scrutiny, the next important signals will be technical details, independent audits, and discussions of changes to Bitcoin. A potential consequence is the emergence of a path to post-quantum protection without a full abandonment of current throughput. Substantial uncertainty remains: the source does not confirm either the security of the scheme or its readiness for deployment.