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Why Coinbase’s Brian Armstrong Sees Quantum Computing as a Long-Term Crypto Security Risk
Brian Armstrong described quantum computing as a greater long term security risk to crypto than AI, with a “when, not if” warning. The supplied reporting does not substantiate the specific 40 year, 256 bit, nine minute, or BIP 360 timeline claims, so they should not be treated as verified remarks or current capabili...
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Key takeaways
- Brian Armstrong described quantum computing as a greater long term security risk to crypto than AI, with a “when, not if” warning.
- The supplied reporting does not substantiate the specific 40 year, 256 bit, nine minute, or BIP 360 timeline claims, so they should not be treated as verified remarks or current capabilities.
- Coinbase reported $719 million in Q3 net income, but revenue fell 35% year over year to about $1.22 billion; prediction markets exceeded $200 million in annualized revenue.[1][2][9]
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openai.comCreate a landscape editorial hero image for this Studio Global article: What did Coinbase CEO Brian Armstrong say on the company’s October 29 third-quarter earnings call about why quantum computing poses a greate. Article summary: Brian Armstrong framed quantum computing—not AI—as the greater long-term threat to crypto security, with a “when, not if” warning, while Coinbase reported a profitable but weaker-revenue third quarter.[5][14] The availab. Topic tags: general, general web, user generated. Style: premium digital editorial illustration, source-backed research mood, clean composition, high detail, modern web publication hero. Use reference image context only for broad subject, composition, and topical grounding; do not copy the exact image. Avoid: logos, brand marks, copyrighted characters, real person likenesses, fake screenshots, UI text, readable text, watermarks, charts with fa
At Coinbase’s October 29 third-quarter earnings Q&A, CEO Brian Armstrong framed quantum computing—not AI—as the more serious long-term threat to cryptocurrency security. The “when, not if” warning was paired with a practical focus: preparing custody systems and blockchain infrastructure before quantum capabilities become a security problem.18
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Why quantum risk is different from AI risk
Armstrong’s comparison concerns the potential impact on cryptography and custody. Reporting on the call says he was not especially worried about AI breaking encryption, while describing quantum computing as a longer-term security risk that could require changes to custody systems and blockchain protocols.7
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That is a warning about future risk, not evidence that existing crypto keys can currently be recovered with quantum computers. The available reporting does not establish that such an attack is presently feasible.18
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What Coinbase is doing to prepare
Coinbase has begun work on post-quantum custody upgrades, according to reporting after the call. The broader issue is not limited to an exchange’s own systems: blockchain protocols may also need changes, and any transition would require coordination across the ecosystem.34
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Coinbase’s quantum work predates the earnings call. Earlier reporting says the company established an independent quantum advisory body in January.35
37 Bitcoin, however, had not selected an upgrade path or migration date in the reporting available here.
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The technical claims that remain unverified
The available source material supports the broad warning and Coinbase’s preparations, but does not substantiate the specific claims that elliptic-curve cryptography has resisted new attacks for roughly 40 years, that brute-forcing a 256-bit number is the relevant comparison, or that Armstrong forecast agreement on BIP 360 within the next couple of quarters.
Likewise, the cited material does not provide evidence or technical assumptions for a Google-attributed estimate that a quantum computer could derive private keys from exposed public keys in about nine minutes. That figure should be treated as an unverified scenario—not as proof of a present-day attack capability. The available reporting describes quantum risk as a longer-term concern, rather than a demonstrated current compromise of crypto wallets.18
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Coinbase’s Q3 results: profit alongside weaker revenue
The quantum discussion came during a quarter with mixed financial results. Coinbase reported $719 million in net income and about $1.22 billion in revenue, down 35% year over year. Its filing lists transaction revenue at about $590 million.1
9 CNBC reported diluted earnings of $2.51 per share and said revenue was below the analyst consensus it cited.
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Coinbase also highlighted growth beyond trading: its official earnings announcement said prediction markets had surpassed $200 million in annualized revenue, and Coinbase One subscribers reached an all-time high.2 The annualized figure is a run-rate measure, not the same as revenue recognized during the quarter.
Together, the call’s security message and financial results point to two separate challenges: planning for a potential future change in cryptography, while the business continues to broaden beyond trading revenue. The quantum warning signals preparation—not an announcement that crypto security has already failed.
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What is the short answer to "Why Coinbase’s Brian Armstrong Sees Quantum Computing as a Long-Term Crypto Security Risk"?
Brian Armstrong described quantum computing as a greater long term security risk to crypto than AI, with a “when, not if” warning.
What are the key points to validate first?
Brian Armstrong described quantum computing as a greater long term security risk to crypto than AI, with a “when, not if” warning. The supplied reporting does not substantiate the specific 40 year, 256 bit, nine minute, or BIP 360 timeline claims, so they should not be treated as verified remarks or current capabilities.
What should I do next in practice?
Coinbase reported $719 million in Q3 net income, but revenue fell 35% year over year to about $1.22 billion; prediction markets exceeded $200 million in annualized revenue.[1][2][9]
Sources
benzinga.comCoinbase CEO Brian Armstrong Says Quantum Computing Is a Bigger Threat to Crypto Than AI: ‘When, Not If’
finance.yahoo.comCoinbase Global Inc (COIN) Q3 2026 Earnings Call Highlights: Prediction Markets Offset Spot ...
tokenpost.comCoinbase CEO Sees Quantum as a Greater Long-Term Crypto Risk Than AI | TokenPost
techflowpost.comCoinbase Post-Quantum Bitcoin Upgrade Proposal