What Bitcoin Did The Truth About Quantum Computing & Bitcoin | Brandon Black
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Feb 3, 2026 
Brandon Black, Bitcoin software engineer who implemented Taproot multi-sig and MuSig2, discusses quantum computing and Bitcoin security. He explains what quantum computers actually do. He questions exaggerated qubit scaling claims. He outlines which Bitcoin key types would be most exposed and how post-quantum upgrades and soft-fork paths might work.
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Brandon's Taproot And Musig2 Work
- Brandon introduced Taproot multisig and Musig2 into production at BitGo early in his Bitcoin career.
- He used that work to meet other developers and get involved in implementation details.
Quantum Won't Replace Classical PCs
- Quantum devices suit probabilistic, domain-specific tasks and are poor at deterministic bit transmission.
- They likely won't replace general-purpose classical computing for everyday digital tasks.
Long Exposure Vs Short Exposure
- Perfect public-key secrecy (never exposing pubkeys/xPubs) protects coins at rest initially.
- Brandon rejects relying on perfect secrecy as a general security assumption for Bitcoin users.