Quantum Threat to Bitcoin Closer Than Expected: Google Warns of Faster Attack Risk

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Google Warns Quantum Threat to <a href="https://pricpr.com/btc-usd/">Bitcoin</a> is Approaching Faster Than Expected

Key Highlights

  • Google’s Quantum AI team warns that breaking Bitcoin’s encryption requires fewer qubits than previously estimated.
  • A fast quantum computer could potentially calculate a private key from an exposed public key and intercept a transfer before the network confirms it.
  • While the Taproot upgrade boosts efficiency, it may expose more wallets to future quantum risks.

Google is cautioning the cryptocurrency world that the security of Bitcoin could be at risk from quantum computers sooner than anticipated. A recent report from Google’s Quantum AI team suggests that cracking the encryption used by Bitcoin and Ethereum might require significantly fewer powerful computing units—called qubits—than experts previously thought.

Previous predictions indicated that breaking today’s internet encryption would need millions of quantum bits, or qubits. However, recent research shows that fewer than 500,000 qubits might be sufficient. This suggests the threat of a quantum computer cracking our networks is arriving sooner than initially expected.

Lower bar for quantum attacks

Google researchers have identified two potential methods by which quantum computers could compromise Bitcoin, requiring approximately 1,200 to 1,450 stable qubits. This is a significantly lower number than previously thought, suggesting the risk to Bitcoin might materialize sooner than expected.

The team demonstrated how an attack could unfold as it happens. When Bitcoin is sent, a piece of public information is briefly visible. A powerful, speedy quantum computer could potentially use this to figure out the secret key and steal the money before the transaction is finished.

Because Bitcoin transactions generally take around ten minutes to process, the analysis indicates an attacker has roughly a 41% chance of being successful if they attempt an attack within nine minutes.

Furthermore, around 6.9 million Bitcoin are currently held in wallets where the public keys have been revealed, including older Bitcoin and addresses that have been used multiple times. This is significantly more than previously thought; CoinShares had estimated that only a small amount of Bitcoin was potentially vulnerable.

Taproot and expanding risk surface

The report also points out potential issues with Bitcoin’s Taproot upgrade. Although Taproot made transactions faster and more private, it unintentionally revealed some information on the blockchain. This could make more digital wallets susceptible to attacks if quantum computers become strong enough in the future. Essentially, a threat once thought to be far off now needs to be taken more seriously.

As the blockchain world prepares for new technologies, Google is building its own systems to be secure in a future where quantum computers exist. The company aims to update all its systems with quantum-resistant security by 2029. They’ve already taken steps in this direction – the Android 17 operating system uses quantum-resistant signatures, and the Chrome browser supports post-quantum key exchange methods.

Building on the technology behind Google’s 2024 Willow chip – which boasts 105 qubits – researchers have made improvements to error correction, simplifying the process of building larger and more powerful quantum computers. This advancement could pave the way for real-world applications of quantum computing.

More people in the tech world are starting to recognize the potential dangers and are working on solutions. Vitalik Buterin, a co-founder of Ethereum, recently highlighted the need to prepare networks for the future. He specifically mentioned a potential upgrade called EIP-8141, which would improve privacy and protect against attacks from quantum computers, making privacy features more central to how the network operates.

Bitcoin’s future is still uncertain. Making improvements to the network requires everyone to agree, and historically, those changes have taken a long time to implement. A problem that was once seen as a far-off possibility is now a pressing technical issue that needs to be addressed right away.

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2026-03-31 09:24