Nine Crypto Firms Form the Quantum Alliance to Guard 6.4 Million Vulnerable Bitcoin — and Nobody Agrees on What Happens Next

Nine crypto companies have formed a new industry group — the Quantum Alliance — to prepare bitcoin, Ethereum and other blockchains for a threat that does not exist yet but that experts warn is getting closer: a quantum computer powerful enough to break the cryptography protecting crypto wallets. The alliance estimates that 6.4 million bitcoin, roughly 30 percent of the entire supply, already have their public keys exposed and could be vulnerable if such a machine is ever built.

By Amir Hassan | October 17, 2026

The Hook: A Fire Drill Before the Fire

According to CoinDesk, which broke the story on October 16, the Quantum Alliance was unveiled by nine crypto companies, including the security auditor Hacken, Charles Hoskinson’s Midnight Foundation, the quantum-resistant blockchain firm Quantus, and Postquant Labs. Their mission: publish common security tests and guidance to help existing networks migrate to quantum-resistant systems — before anyone actually builds a machine that can crack today’s encryption.

The important word in that sentence is before. No quantum computer today can break bitcoin’s cryptography, and the alliance itself is clear about that. This is not a response to an attack. It is an industry fire drill — an attempt to fix the locks on the vault while it is still safe to do so.

On-Chain Evidence: What Is Actually at Risk

Here is the technical problem in plain English. Every crypto wallet has two keys: a public one, which works like your account number, and a secret one, which works like your password. In normal use, the secret key never has to be revealed. But in Bitcoin’s earliest days, an older transaction format exposed public keys more widely, and once a public key is visible, a sufficiently powerful quantum computer could theoretically work backwards to the secret key — like studying the lock closely enough to cut a copy of the key.

• 6.4 million bitcoin — the alliance’s estimate of coins whose public keys are already exposed
• 30.2 percent of supply — the share of all bitcoin that figure represents
• 1.1 million bitcoin — coins attributed to pseudonymous creator Satoshi Nakamoto, part of the exposed total
• Zero — the number of quantum computers today capable of breaking the cryptography

At current prices, that exposed stash is worth hundreds of billions of dollars, which is why the debate over what to do about it keeps getting louder. The most provocative warning came from Christopher Smith, CEO of Quantus, who told CoinDesk that whoever builds the first cryptographically relevant quantum computer could simply take those coins, “probably with the blessing of whichever national government.”

The Core Conflict: Nobody Agrees on the Date — or the Cure

Ask experts when quantum computers will actually threaten bitcoin and you get very different answers. Richard Carback, chief technology officer of Postquant Labs, believes 2028 is a realistic date for a machine capable of breaking today’s cryptography. Bryn Bennett of The Vault counters that “nobody knows the date, but the estimates keep falling,” and that the real question for custodians is “whether you can migrate in time if it arrives early.”

The deeper fight is over what to do with the vulnerable coins themselves. One camp, including Binance founder Changpeng Zhao, has suggested freezing Satoshi’s untouched coins if the quantum threat grows. Bitcoin developer Jameson Lopp has proposed restricting vulnerable coins to prevent theft. Critics say freezing someone’s bitcoin betrays the core promise that no one can confiscate your money. Bennett frames it as a governance problem: “Freezing coins is a governance decision for the Bitcoin network, not for the industry,” and any freeze “would trade quantum risk for a precedent on property rights and neutrality.” Carback prefers moving vulnerable coins rather than freezing them, and has proposed placing them in a trust that owners could reclaim by proving ownership.

Market Implications: Why Regular Holders Should Care

For everyday investors, the practical risks are smaller than the headlines suggest — but not zero. If you use a modern wallet and follow current best practice, your public key typically stays hidden until you spend, and the industry’s migration push is aimed at protecting you before the danger becomes real. The bigger near-term effects are structural:

• Migration costs — upgrading bitcoin’s signatures requires coordination among developers, miners, wallet providers, exchanges and users; Bennett notes “nobody has a credible single number” for the cost
• Higher fees possible — quantum-resistant signatures could take up more block space, potentially raising transaction fees, though researchers are working on fixes
• Network confidence — a credible, coordinated defense protects bitcoin’s store-of-value story; a chaotic one threatens it

The Verdict: An Insurance Policy Worth Reading

The Quantum Alliance will not make headlines by stopping an attack — there has not been one. Its value is in making sure that when the threat estimate keeps falling, as Bennett says it has, the industry is not improvising. Publishing shared security tests and migration guidance is the blockchain equivalent of scheduling the fire drill before smelling smoke.

The honest bottom line for holders: nothing needs to change in your wallet today, and the exposed coins cannot be stolen by any existing machine. But the fact that roughly a third of bitcoin’s supply sits in theoretically vulnerable addresses is exactly the kind of slow-burn structural risk worth monitoring. The alliance’s first publications — and whether the freeze-or-not debate stays civil — will tell you a lot about how seriously the industry is taking its own fire drill.

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