Odaily Planet Daily reports that Blockstream has submitted a Bitcoin Improvement Proposal with specific upgrade recommendations for its post-quantum signature scheme, SHRINCS. SHRINCS has already undergone production testing on Blockstream’s Liquid sidechain, with a minimum signature size of 548 bytes—approximately nine times larger than Bitcoin’s current 64-byte Schnorr signatures, but smaller than NIST-approved schemes such as SPHINCS+. Blockstream’s research shows that adopting SHRINCS would allow Bitcoin to maintain a throughput of approximately 3 TPS, close to current levels; in contrast, adopting NIST-approved schemes could reduce throughput to between 0.36 and 0.5 TPS.
Blockstream Proposes a Post-Quantum Upgrade for Bitcoin Using SHRINCS
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Summary
Bitcoin breaking news: Blockstream has submitted a BIP proposing a post-quantum upgrade using SHRINCS. The scheme was tested on Liquid, producing signatures of 548 bytes—nine times larger than Schnorr but smaller than SPHINCS+. Bitcoin news reports that throughput would remain near 3 TPS, while NIST schemes could reduce it to 0.36–0.5 TPS.
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