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Coinbase CEO Brian Armstrong said quantum computing poses a greater long-term threat to cryptocurrency security than AI and called on blockchain networks to prepare for quantum-resistant cryptography. Coinbase is upgrading its custody systems, while a Google research estimate of a nine-minute private-key attack describes a modeled future capability, not an attack demonstrated on Bitcoin.
Coinbase CEO Brian Armstrong said quantum computing is a greater long-term threat to cryptocurrency security than artificial intelligence, and said the company has begun upgrading its custody infrastructure as it prepares for possible future attacks. He also urged blockchain networks to develop quantum-resistant security, though he said a capable quantum attack is not imminent.
Speaking on Coinbase’s third-quarter earnings call, Armstrong distinguished between AI’s potential to find new ways to attack existing cryptography and quantum computers’ ability, if built at sufficient scale, to perform calculations that could undermine it. He expressed little concern that AI would break the elliptic-curve cryptography used to authorize transactions on major cryptocurrency networks. The call transcript was published by Yahoo Finance.
Armstrong said Coinbase is working on protections for its custody infrastructure, which safeguards customer assets. He said that work by one exchange is not enough: the underlying blockchains also need to adopt security measures designed to withstand quantum computing. Coinbase announced an independent advisory board on quantum computing and blockchain in January to review scientific developments and advise on industry preparation.
The report also cites Google researchers’ modeled estimate that a sufficiently capable future quantum computer could recover a private key in about nine minutes after a public key becomes available, under specified hardware assumptions and after part of the calculation has already been completed. The estimate describes a theoretical scenario involving advance preparation; it is not evidence of a demonstrated attack against Bitcoin or another blockchain.
Preparing Crypto Custody for Quantum Risk
The concern reaches beyond Coinbase because many major blockchain networks, including Bitcoin and Ethereum, use elliptic-curve cryptography. In these systems, a public key supports verification of a digital signature, while a private key authorizes spending. If a future attacker could derive the private key from an exposed public key, the attacker could potentially authorize transactions without the owner’s permission.
That possibility makes preparation a network-wide issue. Coinbase can modify its own custody systems, but the security of assets also depends on the protocols and software used by the blockchains on which those assets exist. Moving to post-quantum cryptography would require decisions and changes across networks, not simply a change by one exchange. Armstrong’s comments signal that Coinbase views this as a long-term planning problem for the wider industry, rather than an immediate incident.
The nine-minute figure may sound like a near-term countdown, but the cited estimate depends on assumptions about a future machine and advance computation. It does not establish that an attacker can currently recover crypto keys. The practical question is whether networks can agree on and implement new safeguards before quantum hardware reaches the capabilities needed to threaten existing cryptography.
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How Quantum Key Recovery Could Matter
Elliptic-curve cryptography is used to prove authorization for transactions without revealing the private information that grants control of funds. A public key can be shared so others can verify a signature; the corresponding private key must remain secret. The security concern described in the report is that a sufficiently capable quantum computer might calculate the private key from the public key.
Armstrong contrasted this with AI, which he said has not made meaningful progress toward breaking the cryptography in use. He cited a roughly 40-year history of attempts to find algorithms that would make the systems easier to break, saying those efforts had made “basically zero progress.” That is Armstrong’s characterization of past research, not a finding that cryptography is permanently immune to new techniques.
Google researchers have urged cryptocurrency networks to prepare for post-quantum cryptography. Their attack estimate depends on particular hardware assumptions and a process in which some calculation is completed before the target public key is available. The timing should be read as a result of that modeled scenario, not as a general prediction that crypto keys can be cracked in nine minutes today.
““I think that’s more of a matter of when, not if.””
— Brian Armstrong, Coinbase CEO
The Hardware Timeline Remains Unknown
The report does not give a date for when quantum computers might reach the scale needed to threaten cryptocurrency cryptography. Armstrong said he does not expect an attack imminently, but described the longer-term risk as a matter of when rather than if. That is his assessment, not a confirmed timetable for quantum hardware development.
The nine-minute estimate is conditional on specified hardware assumptions and advance preparation. The source does not establish that any existing machine can carry out the modeled attack, or that current Bitcoin or Ethereum keys have been compromised. It also does not detail a finalized migration plan, technical design, or timetable for the major blockchain networks.
It remains unclear how quickly networks could agree on and deploy post-quantum protections, how upgrades would affect users and existing assets, and what measures different chains will adopt. Coinbase’s custody work addresses its own infrastructure; the company cannot implement protocol changes on behalf of every blockchain.
Bitcoin Community Faces Upgrade Decisions
Armstrong said he hopes the Bitcoin community will begin converging on a path forward over the next couple of quarters. That is a stated hope, not a confirmed deadline or an announcement that Bitcoin has selected a particular post-quantum system.
Coinbase’s custody upgrades and the work of its quantum advisory board are among the preparations described so far. The next developments to watch are whether blockchain communities set out concrete upgrade proposals, how researchers refine estimates of the hardware needed for key recovery, and whether networks establish migration plans before a practical quantum threat emerges.
Key Questions
What did the Coinbase CEO say about quantum computing and crypto?
Brian Armstrong said quantum computing is a greater long-term security threat to cryptocurrency than AI. He urged blockchain networks to prepare for quantum-resistant cryptography and said Coinbase is working on its custody infrastructure.
Can a quantum computer currently steal Bitcoin?
The source does not report a demonstrated quantum attack on Bitcoin. The cited nine-minute estimate is a model of a future machine under particular assumptions, not evidence that current computers can recover Bitcoin private keys.
What does the nine-minute estimate refer to?
Google researchers modeled a scenario in which a sufficiently capable quantum computer could recover a private key in about nine minutes after a public key became available, following advance preparation. The estimate depends on specified hardware assumptions.
What is Coinbase doing about the risk?
Armstrong said Coinbase has started upgrading its custody infrastructure. The company also announced an independent advisory board in January to assess quantum-computing developments and advise on preparation. The report does not provide a completion date or detailed technical plan.
When might blockchain networks upgrade?
No adoption timetable is confirmed. Armstrong said he hopes the Bitcoin community will begin converging on a path forward over the next couple of quarters, but that is not a commitment to a specific upgrade or launch date.
Source: thequantuminsider.com
