Google’s quantum computer: A 9-minute threat to Bitcoin?

Google Reduces the Resources Needed to Hack Bitcoin by 20x

On March 30, 2026, Google Quantum AI published a whitepaper that shook the crypto markets well beyond research circles. Titled “Securing Elliptic Curve Cryptocurrencies against Quantum Vulnerabilities”, co-authored with teams from Stanford and the Ethereum Foundation, the document demonstrates that breaking the elliptic curve cryptography securing Bitcoin and Ethereum would require fewer than 500,000 physical qubits, representing a reduction of about 20 times compared to previous estimates that projected several million.

The described quantum machine could crack a Bitcoin private key in about 9 minutes once the public key is exposed, giving an attacker roughly a 41% chance of beating the network’s 10 minute confirmation window. This paves the way for so-called “on-spend” attacks: targeting an active transaction in the mempool before it is confirmed in a block.

What the Whitepaper Explains

Before diving deeper, a point of clarity is in order. Panic is unwarranted. The team published a rigorous estimate of the resources required to solve the Elliptic Curve Discrete Logarithm Problem (ECDLP), and this result is lower than previous estimates. However, “lower” and “feasible today” are not the same thing. IBM’s roadmap for fault tolerant systems targets around 200 logical qubits by 2029 with its Starling system. This is still a long way from the 1,200 to 1,450 logical qubits that the attack requires. Scaling from a few thousand qubits to hundreds of thousands involves unresolved engineering problems.

What really changes with this publication is the perceived compression of the timeline. “We are no longer looking at the mid-2030s, we could have quantum computers at this scale by the end of the decade,” stated Haseeb Qureshi, managing partner at Dragonfly. It is this revision of the estimated timeline, rather than an immediate threat, that deserves the attention of crypto investors.

6.9 Million BTC Exposed: Which Wallets Are at Risk?

Approximately 6.9 million bitcoins are particularly vulnerable, notably the Legacy (P2PK) addresses used in the early days of the network. This includes wallets attributed to Satoshi Nakamoto, as well as addresses whose public key has been exposed on the blockchain through past transactions.

Pay-to-Taproot (P2TR) addresses present a specific exposure. They expose public keys as elliptic curve points directly on-chain, giving a quantum attacker an indefinite window to work offline. Table I of the whitepaper quantifies this exposure: P2TR outputs were associated with roughly 16.8 million BTC moved in 2025, representing 21.68% of all Bitcoin transactions that year.

This detail about Taproot is particularly ironic: the 2021 upgrade was pitched as an improvement in privacy and efficiency, and its massive adoption now creates a broader attack surface in the event of a quantum breakthrough.

Bitcoin vs. the Quantum Threat: Who Is Ready?

The two major networks are following very different trajectories regarding this threat. Ethereum has spent years preparing quantum resistant upgrades, with milestones already planned in its roadmap for the end of the decade. Account abstraction and signature flexibility give it a head start in replacing cryptographic primitives. For Bitcoin, the path is more deliberate. Proposals like BIP-360 and experimental testnets are initial steps. However, a full migration would likely require a major consensus upgrade.

Our take on this matter: the calm reaction of the market at the time of publication is instructive in itself. Professional traders are treating this signal as a 3 to 5 year risk, not an immediate emergency. This rationality is justified. However, two concrete actions deserve attention today for any Bitcoin holder. Avoid reusing receiving addresses and verify that funds are not exposed in Legacy P2PK addresses. This is not paranoia; it is basic security hygiene that the Google publication has just made more urgent than ever.

Sources:

• BSCNews on X
• Cointelegraph
• nic_carter on X

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