Key Takeaways
- A new Google study reveals quantum computers could compromise Bitcoin transactions in approximately 9 minutes
- The breakthrough requires just ~500,000 qubits — dramatically fewer than the 10 million previously estimated
- Approximately 6.9 million BTC currently face exposure, with 1.7 million coins from Bitcoin’s earliest days at risk
- Financial analyst firm Bernstein characterizes the threat as “real but manageable” within a 3-5 year timeframe
- The proposed BIP-360 soft-fork aims to mitigate quantum vulnerabilities for Bitcoin addresses
A newly released whitepaper from Google’s Quantum AI division has sent ripples through the cryptocurrency community by demonstrating how quantum computers could compromise Bitcoin’s security faster than previously anticipated. Published March 30, the research reveals a concerning timeline for the world’s leading cryptocurrency.
According to the study, breaking Bitcoin’s 256-bit elliptic curve encryption would require approximately 500,000 quantum bits (qubits). This represents a dramatic reduction from prior projections, which suggested upwards of 10 million qubits would be necessary for such an attack.
The vulnerability stems from a brief exposure period during Bitcoin transactions. When users initiate transfers, their public keys become visible before transaction confirmation completes. A sophisticated quantum system could theoretically exploit this window to derive the corresponding private key and redirect funds.
Given Bitcoin’s average confirmation time of approximately 10 minutes, Google’s researchers calculated that a quantum-based attack executed during this interval would carry a success probability of just below 41%.
The whitepaper identifies nearly 6.9 million Bitcoin currently susceptible to quantum attacks. This total encompasses roughly 1.7 million coins originating from Bitcoin’s genesis period under Satoshi Nakamoto, when the protocol automatically revealed public keys.
Interestingly, the 2021 Taproot implementation—designed to enhance Bitcoin’s privacy capabilities and transaction efficiency—also defaults to public key exposure. Google’s analysis suggests this architectural choice may have inadvertently expanded the attack surface.
Cryptocurrencies with faster block confirmation times, including Ethereum, appear to face reduced exposure to this particular quantum vulnerability.
The Clock Is Ticking on Protocol Upgrades
Investment research firm Bernstein has weighed in on the quantum computing challenge, labeling it a “real but manageable” concern in their latest market analysis. The firm suggests recent Bitcoin volatility already incorporates growing investor recognition of this emerging risk.
🚨HUGE: QUANTUM RISK TO $BTC “NEITHER EXISTENTIAL, NOR NOVEL”
According to several Bernstein analysts speaking to DLNews, the quantum threat posed to Bitcoin is little more than a required technical upgrade for $BTC.
As DLNews wrote, it is “not a death sentence for Bitcoin”.… pic.twitter.com/E97B27J2AX
— BSCN (@BSCNews) April 9, 2026
According to Bernstein’s projections, Bitcoin developers have approximately 3–5 years before quantum machines with practical attack capabilities become operational. This timeline provides a critical window for the global Bitcoin community to implement defensive measures.
Among the solutions under consideration is BIP-360, a proposed soft-fork modification that would create a new transaction output format designed to conceal public keys until the moment of spending. Research from Binance highlights that while BIP-360 doesn’t address every immediate vulnerability, it eliminates what they describe as a “massive existential threat.”
Bernstein’s analysis emphasizes that the technical challenge of developing quantum-resistant code is secondary to the logistical hurdle of coordinating millions of wallet migrations and achieving consensus across Bitcoin’s decentralized ecosystem.
Expert Perspectives on the Timeline
Chris Tam, who leads quantum technology firm BTQ Technologies as president, shared with TheStreet that projections for quantum cryptography-breaking capabilities have consistently shortened over recent years.
Tam stressed that decentralized blockchain networks cannot implement security updates instantaneously. Comprehensive network-wide protocol modifications typically demand months or even years for proper deployment.
BTQ Technologies is actively developing and testing Bitcoin Quantum, an experimental fork of Bitcoin incorporating quantum-resistant cryptographic algorithms.
Google disclosed that its own migration to post-quantum cryptography began in 2016 and recommended that cryptocurrency projects initiate similar transitions immediately.
At publication time, Bitcoin was trading at $68,073.72.
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