CoinDesk Podcast Network The Blockspace Pod: Quantum: The Next Battleground For Bitcoin
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Feb 7, 2026 A fiery debate about whether quantum computers are a real threat to Bitcoin or just FUD. They unpack the Factor 21 meme and why small-number demos may mislead. The conversation explores game theory around builders, the trade-offs of post-quantum signatures, and institutional pressure on developer decision-making. Tension between cautious research and investor urgency fuels the whole discussion.
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Factor 21 Undercuts Quantum Panic
- The "factor 21" meme argues quantum alarmism is overblown because current quantum PCs can't reliably factor tiny numbers like 21.
- Brandon Black says scaling to Bitcoin-strength 256-bit challenges is astronomically harder today.
Quantum Breakthroughs Could Be Sudden
- Alex Pruden warns progress could be discontinuous: researchers may skip tiny demos and build cryptographically relevant machines first.
- He argues an attacker will only build a quantum computer if it yields useful, profitable capability, so the leap could happen suddenly.
Don't Rush Post‑Quantum Swaps
- Brandon Black advises caution before forcing post-quantum signatures into Bitcoin now due to throughput and feature trade-offs.
- He warns adopting today's PQ algorithms could bloat blocks or reduce transaction capacity and lock in suboptimal math.