Andrew Gault, a long-time investor in deep tech and quantum hardware, has stated that the crypto industry is focused on the wrong quantum computing threat. According to Gault, the real risk to Bitcoin and other digital assets isn’t just about wallets and breaking keys—the true vulnerability lies in the encrypted messaging traffic between exchanges, bridges, and custodians.
“Harvest Now, Decrypt Later” Strategy
As CEO of ZeroTier, Andrew Gault points to a critical weakness in today’s financial structure: data transmitted in real time between institutions. He notes that encrypted messages and authentication logs are being collected by advanced attackers who, even if they cannot read the data now, aim to decrypt it in the future when technology allows.
The threat Gault highlights is known in cryptography circles as the “harvest now, decrypt later” model. That is, threat actors gather data today—even if they cannot break the encryption—so that when quantum computers become powerful enough, they can retroactively access this information.
“Authentication logs being collected now are not just sensitive information; they are documents that prove who owns what, who approved which transaction, and where legal responsibility lies,” Gault emphasized.
Industry Response to Quantum Threats
A recent Google study found that a sufficiently advanced quantum computer could extract Bitcoin private keys from public addresses in as little as nine minutes. In the wake of this research, concerns mounted over the 6.9 million BTC parked at public addresses and the absence of a comprehensive post-quantum migration plan for Bitcoin.
Google security engineers have shifted their focus toward securing digital signatures and authentication infrastructure. In Google’s latest security note, the company aims to complete the transition to post-quantum cryptography by 2029.
Major crypto exchanges and custody providers have yet to share a clear roadmap for updating their signing infrastructure. Ethereum, meanwhile, has initiated some community-driven efforts towards a post-quantum transition.
Mini glossary: Post-quantum cryptography is an encryption approach developed with the expectation that quantum computers will eventually break classical methods, aiming to keep data secure in the future.
Billions at Stake in Economic Risk
Citi has modeled that if one of America’s top five banks were hit by a quantum attack, the resulting ripple effects could produce losses between $2 trillion and $3.3 trillion. According to the Global Risk Institute, the probability of a quantum computer capable of breaking cryptography emerging by 2034 is estimated at 19% to 34%.
| Sector/Concept | Post-Quantum Transition Plan | Key Risk |
|---|---|---|
| Bitcoin | Not Ready | Public addresses, signature traffic |
| Ethereum | Transition Started | Technical challenges |
| Major Exchanges/Custodians | No Public Plan | Authentication and signature logs |
| Banking System | Planned (2029) | Payment system access |
As shown in the table, there are still critical gaps in the industry’s quantum readiness. According to CoinShares’ analysis, fears about wallet key breaches could be overstated—the market impact would be limited to fewer than 10,000 BTC if private keys are cracked. Nevertheless, Gault and some risk analysts contend that the main risk lies in identity verification and signing systems rather than just private key exposure.
