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Quantum Computing Threatens Bitcoin Security: Industry's Response

Quantum Computing Threatens Bitcoin Security: Industry's Response

First seen 27 Sep 2026, 19:07 UTC • •

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ThreatCluster AI
ThreatCluster •September 27, 2026 at 19:57 UTC
  • •Quantum computers could potentially break Bitcoin's cryptography, risking wallet theft.
  • •Three defense strategies are being explored: quantum-safe transactions, protocol upgrades, and custody protections.
  • •Recent developments include cost reductions in quantum-safe transactions and Coinbase's custody plans.

Quantum computers pose a potential risk to Bitcoin's elliptic-curve cryptography, leading to possible wallet theft, a scenario referred to as 'Q-Day.' Although no quantum computer capable of this attack currently exists, the timeline for such technology is shortening, prompting the industry to explore three main defense strategies: quantum-safe transactions under existing rules, protocol upgrades like soft forks, and custody-layer protections. Recent advancements include a significant cost reduction in quantum-safe transactions, initial community engagement on protocol upgrades, and Coinbase's plans for post-quantum custody. Bitcoin's price remains stable, reflecting investor confidence despite these risks. The industry is actively preparing for the quantum threat while assessing its pace.

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Timeline

2026-08-01
First quantum-safe Bitcoin transaction mined
StarkWare successfully mined the first quantum-safe Bitcoin transaction on the mainnet, marking a significant milestone in defense efforts.
Decrypt.Co
2026-09-27
Cost breakthrough in quantum-safe transactions
StarkWare announced a reduction in the estimated cost of building quantum-safe transactions from $320 to approximately $67 within a week.
Decrypt.Co
2026-09-27
Coinbase outlines post-quantum custody plans
Coinbase's head of cryptography revealed the exchange's strategy for adapting custody to future quantum-safe signature schemes.
Decrypt.Co

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