Key Takeaways
- A recent Google whitepaper indicates quantum computers could compromise Bitcoin transactions in approximately 9 minutes
- Breaking Bitcoin’s encryption requires roughly 500,000 qubits — significantly fewer than previously projected
- Approximately 6.9 million Bitcoin remain vulnerable to quantum attacks, including 1.7 million coins from early network days
- Wall Street firm Bernstein characterizes the threat as “real but manageable” with a 3-5 year upgrade timeline
- BIP-360 represents a potential soft-fork solution to mitigate quantum vulnerabilities in Bitcoin wallets
A new research paper from Google’s Quantum AI division warns that quantum computing technology could potentially compromise a Bitcoin transaction in approximately nine minutes. The document, made public on March 30, details the accelerating timeline for this emerging security challenge.
According to the findings, breaking the 256-bit elliptic curve cryptography that secures Bitcoin wallets and transactions would require fewer than 500,000 qubits. This represents a dramatic reduction—approximately 20-fold—compared to previous scientific estimates.
When Bitcoin users initiate transactions, their public keys become temporarily visible before network confirmation completes. A sufficiently advanced quantum computer could theoretically exploit this exposure window to derive the corresponding private key and redirect funds.
Bitcoin’s network typically requires approximately 10 minutes to confirm transactions. Google’s analysis suggests a quantum-based attack executed during this timeframe would achieve success in just over 41% of attempts.
The research identifies approximately 6.9 million Bitcoin as currently susceptible to quantum threats. This total encompasses roughly 1.7 million coins originating from Bitcoin’s earliest era, when the protocol exposed public keys automatically.
The Taproot upgrade implemented in 2021, designed to enhance Bitcoin’s privacy features and operational efficiency, also defaults to exposing public keys. Google’s researchers noted this architectural choice may expand the pool of at-risk wallets.
Cryptocurrencies like Ethereum, which process transactions more rapidly than Bitcoin, face reduced exposure to this particular attack vector.
Time-Sensitive Upgrade Path
Investment research firm Bernstein characterized the quantum computing risk as “real but manageable” in recent analyst commentary. The firm suggested that recent Bitcoin market volatility already incorporates growing investor recognition of this threat.
🚨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 assessment, Bitcoin developers have approximately 3-5 years before quantum machines with practical attack capabilities emerge. This timeframe provides an opportunity for the Bitcoin community to coordinate protective measures.
Among the proposals under consideration is BIP-360, a soft-fork upgrade introducing a new output structure designed to conceal public keys until transaction execution. While Binance Research acknowledges BIP-360 doesn’t address all immediate vulnerabilities, the firm described it as eliminating a “massive existential threat.”
Bernstein emphasized that the technical challenge of developing quantum-resistant code pales in comparison to the organizational hurdle of migrating millions of users and achieving consensus across a decentralized ecosystem.
Expert Perspectives
Chris Tam, president of quantum technology firm BTQ Technologies, informed TheStreet that projections for when quantum computing could compromise cryptographic systems have consistently shortened over recent years.
Tam stressed that decentralized networks cannot implement updates instantaneously. Network-wide protocol changes demand months or years of coordinated implementation.
BTQ Technologies is actively developing and testing Bitcoin Quantum, a quantum-resistant Bitcoin fork incorporating protective features against quantum computing threats.
Google indicated it has pursued post-quantum cryptography migration strategies since 2016 and recommended cryptocurrency communities initiate their own transition processes immediately.
Bitcoin was valued at $68,073.72 when this report was compiled.
