← The Signal№ 147 · Research · November 21, 2025 · 1 min read
Quantum bitcoin thread
Quantum won’t break Bitcoin’s SHA-256 anytime soon — even with Grover’s algorithm, it remains secure well beyond 2030. The real risk lies in ECDSA signatures, where Shor’s algorithm could expose…
Quantum won’t break Bitcoin’s SHA-256 anytime soon — even with Grover’s algorithm, it remains secure well beyond 2030.
The real risk lies in ECDSA signatures, where Shor’s algorithm could expose private keys once public keys are revealed.
But the limiting factor isn’t math — it’s hardware. Experts place the threat window closer to 2035–2045.
Bitcoin was designed to adapt, and the path forward is clear: proactive wallet practices today, and a phased migration to post-quantum cryptography tomorrow.