By Isaac • August 30, 2026 7:07 pm •
Bitcoin’s quantum-computing debate just moved one step closer to engineering.
Blockstream researchers have published SHRINCS, which they describe as the first concrete post-quantum signature proposal built specifically for Bitcoin. The proposal supplies exact algorithms and an executable reference implementation instead of another distant warning about quantum computers.
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The catch is equally important: the defense is not ready to slide into Bitcoin without cost.
According to Cointelegraph’s current summary of the research, the team reduced what began as an enormous hash-based signature by roughly 13.23 times. Even after that work, a SHRINCS signature remains about nine times larger than the signatures Bitcoin uses today.
That is the core issue. Bitcoin also has to weigh block space, verification
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