Elon Musk Sees a Silver Lining in Quantum Computing Breaking Bitcoin

TLDR

• Google’s quantum AI paper says a fast-clock quantum computer could crack a Bitcoin transaction in about nine minutes
• Bitcoin takes roughly 10 minutes to confirm, leaving only a one-minute safety window
• The qubit requirement has dropped from millions to under 500,000 — a 20-fold reduction
• Google has moved up its own quantum computing timeline to 2029
• Elon Musk joked there’s a “plus side”: forgotten crypto wallet passwords could one day be recovered

Google researchers published a whitepaper showing that a quantum computer, built on architecture similar to their existing Willow chip, could derive a Bitcoin private key from a public key in roughly nine minutes. A standard Bitcoin transaction takes about ten minutes to confirm. That leaves a margin of around one minute.

During that window, an attacker could theoretically intercept a live transaction directly from the mempool — the pool of unconfirmed transactions — before it settles. The paper estimated the probability of a successful attack at just under 41%.

The paper came from Google Quantum AI and focused specifically on breaking the 256-bit Elliptic Curve Discrete Logarithm Problem (ECDLP), which is the cryptography Bitcoin actually uses. Previous threat estimates were based on a different, older encryption standard called RSA-2048, which made those earlier timelines look much longer.

One of the most striking findings is the drop in resource requirements. Earlier research suggested breaking Bitcoin’s encryption would need tens of millions of qubits. The new paper puts that number at fewer than 500,000 — a 20-fold reduction. It only requires 1,200 logical qubits at a 0.1% error rate.

Google has also reportedly moved up its own internal quantum computing timeline to 2029.

A separate research group called Oratomic published a parallel finding. Using neutral-atom hardware and a different technical approach, they showed that Shor’s algorithm — the quantum method used to break encryption — can work at cryptographically relevant scales using between 10,000 and 22,000 qubits.

Two different research teams. Two different hardware architectures. Both pointing in the same direction.

Why Upgrading Bitcoin Is So Difficult

Switching Bitcoin to post-quantum cryptography is not a simple update. It requires a hard fork, which means getting broad community consensus — something that has historically been slow and contentious in the Bitcoin ecosystem.

Post-quantum cryptographic signatures are also much larger than current ones, which increases bandwidth, storage, and computing demands across the network.

Even after consensus is reached, the actual migration would take months. At Bitcoin’s current transaction rate, moving all coins to post-quantum addresses — while processing nothing else — would still take several months to complete.

Experts warn that waiting until a cryptographically relevant quantum computer is publicly confirmed — often called “Q-Day” — would be too late. By that point, digital signatures may already be compromised.

Elon Musk Weighs In

Elon Musk responded to the Google warnings on X, where he has over 237 million followers. He noted there was a “plus side” to quantum computing breaking Bitcoin: people who forgot their wallet passwords might one day be able to get back in.

The comment reflects a real concern — quantum computing powerful enough to crack encryption could also access wallets that have been locked due to lost credentials.

Google’s paper is titled “Securing Elliptic Curve Cryptocurrencies against Quantum Vulnerabilities: Resource Estimates and Mitigations.”

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