By Isaac • August 26, 2026 11:08 pm •
Bitcoin now has its first concrete draft for a post-quantum signature system built specifically around the network’s constraints. The proposal is called SHRINCS, and its biggest achievement may be that it turns a distant security debate into exact algorithms that developers can inspect, test and challenge.
SHRINCS remains a draft rather than a finished Bitcoin upgrade. It tries to make hash-based signatures practical enough for Bitcoin by combining two very different signing paths.
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One path is compact but stateful, meaning a wallet has to remember which one-time signing keys it has already used. The other is stateless and safer to recover, but it produces much larger signatures.
That tradeoff is the real story.
The new SHRINCS
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