The G7 Says Quantum Computers Could One Day Crack Your Crypto Wallet — and It Wants Governments and Banks to Act Now

The Group of Seven (G7) has published an official warning that quantum computers could eventually break the cryptography protecting bank accounts, government records, and crypto wallets — and it is telling governments and companies to start migrating to quantum-resistant security now, because the transition could take years. For anyone holding Bitcoin, Ethereum, or Solana, the report is a reminder that the math protecting your funds has an expiry date, even if that date is still far away.

By Raj Patel | September 5, 2026

The Hook: “Harvest Now, Decrypt Later”

The report comes from the G7 Cybersecurity Working Group — a body representing Canada, France, Germany, Italy, Japan, the United Kingdom, and the United States. According to Decrypt, which reviewed the document, the group warned that “several recent advances” suggest quantum computers capable of breaking widely used public-key cryptography are closer than many assume, even if the exact timeline is uncertain.

The scariest part is an attack pattern security researchers call “harvest now, decrypt later.” Criminals or hostile states can steal encrypted data today — while quantum computers are still too weak to crack it — and simply store it until the machines catch up. In plain terms: a hacker who grabs your encrypted traffic in 2026 could read it in five or ten years if the defense isn’t upgraded.

On-Chain Evidence: Crypto Developers Are Already Moving

The G7 report does not mention cryptocurrency by name. But the same class of public-key cryptography that protects government infrastructure also protects blockchain wallets and authorizes every transaction. And the major chains are not waiting around:

• Bitcoin — developers are debating post-quantum proposals, including one called BIP-360, which would prepare the network to support new, quantum-resistant signature schemes
• Ethereum — researchers have proposed rebuilding the network’s deposit contract so staking can support the larger keys post-quantum systems require
• Solana — the Solana Foundation has already tested post-quantum signatures on a test network and introduced an optional hash-based vault for protecting funds

Important context: today’s quantum computers cannot break Bitcoin’s cryptography. This is a preparation problem, not an emergency. But because upgrades on decentralized networks require broad agreement from developers, miners, businesses, and users, the lead time is measured in years — which is exactly why the G7 is pushing for early action.

The Core Conflict: Security Upgrades vs. Network Disruption

Here is where it gets politically messy for crypto. Bitcoin has no CEO and no management team. Any major security change needs broad consensus, and Bitcoin holders would need a safe way to move funds from older, potentially vulnerable addresses to quantum-resistant ones without disrupting the network. Get the migration wrong and you risk chaos; delay too long and you risk funds sitting in addresses that a future quantum computer could forge signatures for. The G7 made the same point about the wider economy, writing that the transition “can only be achieved with early engagement, coordinated planning, and informed decision-making across the public and private sectors.”

Market Implications: A Slow-Burn Story, Not a Price Mover

Do not expect this report to move prices tomorrow — Bitcoin is trading just below 80,000 USD this week, and market attention is dominated by jobs data and Federal Reserve policy. But the quantum question has a habit of resurfacing every time a lab announces a breakthrough, often triggering sudden sell-offs in coins perceived as quantum-vulnerable. A credible, coordinated migration plan across the major chains would remove one of the last existential-sounding risks from the industry’s narrative — and that matters for long-term institutional confidence. The G7 group also urged governments to add quantum security requirements to public procurement and to fund national post-quantum strategies, which means the pressure will keep building through official channels rather than fading away.

The Verdict: Boring Preparation Beats Panic Later

For regular investors, the practical takeaway is modest but real. First, this is a years-long process — there is no reason to sell crypto over a G7 advisory. Second, funds held on modern wallets will likely be migratable when the time comes; long-dormant addresses, including the early coins last moved over a decade ago, are the sector’s real headache. And third, watch for the words “post-quantum” in roadmaps from the chains you own — networks that plan openly are safer long-term bets than networks that stay silent.

The cryptocurrency market remains highly volatile. This article is for informational purposes only and does not constitute financial advice.