With SHRINCS, Bitcoin throughput would be approximately 3 TPS; Blockstream submits quantum-resistance upgrade proposal

Odaily Blockstream has submitted a Bitcoin Improvement Proposal outlining specific upgrade recommendations for its post-quantum signature scheme, SHRINCS. SHRINCS has completed production-environment testing on Blockstream's Liquid sidechain, with a minimum signature size of 548 bytes—roughly nine times larger than Bitcoin's existing 64-byte Schnorr signatures, but smaller than NIST-approved schemes such as SPHINCS+. Blockstream research indicates that if SHRINCS were adopted, Bitcoin throughput could be maintained at approximately 3 TPS, close to current levels; however, if a NIST-approved scheme were adopted instead, throughput could drop to between 0.36 and 0.5 TPS.