The real quantum risk in crypto is data in transit, not wallet keys

The biggest quantum danger to crypto lies not in the future hacking of wallet keys, but in the encrypted transaction data that adversaries are quietly harvesting today, Zerotier CEO Andrew Gault warned.

The risk lies in data already in motion

The crypto industry’s focus on quantum-protected wallets may not be targeting the right target, according to Andrew Gault, chief executive of networking firm Zerotier. He says that the mThe most pressing danger lies not in the stored keys, but in the information flowing between institutions in real time, further adding:

“The most dangerous vulnerability in the financial system lies not in stored data, but in the data that currently flows between institutions. Every interbank message, every payment authentication record, and every digital signature circulating on a network today is collected by sophisticated adversaries who don’t yet need to read it.”

Gault’s warning focuses on a strategy that security researchers call “harvest now, decrypt later.” The idea is that an attacker does not need a working quantum computer today to benefit from it tomorrow. Encrypted traffic can be copied and stored inexpensively now, then deciphered years later, once a sufficiently powerful machine exists.

This reframes the quantum threat from a future event to current blockchain title=”Learn more about blockchain” target=”_blank”>blockchains. An adversary capable of rewriting or impersonating them in the future could call into question past transactions, a systemic risk rather than a series of isolated thefts.

The warning sharpens an uncomfortable contrast because while Ethereum has moved toward a coordinated post-quantum migration, Bitcoin has not adopted a comparable plan. Bitcoin transactions are secured by the Elliptic curve digital signature algorithm (ECDSA), a pattern that a sufficiently powerful quantum computer could theoretically break.

However, the deadlines are still very controversial, as analyst Nic Carter believes that a so-called Q-Day could arrive by 2035while other estimates are much more aggressive, placing a code-breaking machine as early as 2027. Google’s quantum advances have repeatedly brought the security debate back into focus, with venture capitalist Chamath Palihapitiya recently warning that non-state actors could one day target Bitcoin holdings as a “honeypot.”

And even though developers are becoming more vocal after years of relative silence, the dominant approach still favors voluntary transitions and the expectation of mature standards rather than forced protocol change, a stance that Gault’s comments implicitly call into question.

Securing data in transit

Zerotier is not a neutral spectator in the debate as the company recently launched Zero-level quantuma networking platform designed to meet the highest U.S. government cryptographic standards, including standards set by the National Institute of Standards and Technology (NIST). Gault’s framework naturally prioritizes securing data in transit, a problem solved by its product.

Yet the underlying point is hard to ignore. If adversaries are already banking on crypto traffic for an upcoming payday, then the window to protect it is now, not Q-Day. For Bitcoin in particular, the question is whether a community that values ​​deliberate, consensual change can move quickly enough to defend the data collected while the debate continues.