New Google Research Shrinks Bitcoin Quantum Hack Timeline

Google reveals a quantum breakthrough that could crack Bitcoin encryption in 9 minutes. Here’s what it means for crypto security.

Google’s Quantum AI team has published research that is sending shockwaves through the crypto world. The paper reveals a significantly more efficient method for breaking the encryption that protects Bitcoin. 

According to the findings, a quantum computer could crack Bitcoin private keys in roughly nine minutes. 

Bitcoin’s average block time is ten minutes. 

That narrow margin is what’s making security researchers deeply uneasy.

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Google’s Quantum Breakthrough Puts Bitcoin Encryption at Risk

The research centers on a more efficient implementation of Shor’s algorithm. 

The Google team found a way to break elliptic curve cryptography using around 1,200 logical qubits and 90 million Toffoli gates. That figure marks roughly a 20-fold reduction in the physical qubits previously needed. 

Earlier estimates put that number far higher, making attacks seem distant. Now, the timeline looks far more pressing.

Project Eleven, a crypto security organization, reacted publicly on X. 

The group described the development as “the quantum alarm” and warned that mempool attacks are now a real threat. 

Unconfirmed Bitcoin transactions sitting in the mempool could become targets before they clear. Project Eleven also noted that the top 1,000 Ethereum wallets could face exposure within nine days.

Google’s team chose not to publish the actual quantum circuits used in this research. This marks the first time a quantum resource estimation paper has withheld that level of detail for security reasons. 

Instead, the team published a zero-knowledge proof. It allows third parties to verify the claims without giving bad actors a working blueprint.

Mempool Attacks and Vulnerable Bitcoin Wallets Explained

The research identifies two categories of risk. First, wallets with permanently exposed public keys face what researchers call at-rest attacks. 

Project Eleven estimates that around 6.7 million Bitcoin fall into this category. Roughly 1.7 million BTC sits in P2PK scripts, which include Satoshi-era mining rewards. Those public keys are visible on-chain and cannot be hidden.

Second, the new nine-minute attack window makes mempool attacks viable. When a user broadcasts a transaction, the public key becomes visible before the block confirms. 

A sufficiently powerful quantum computer could theoretically derive the private key in that window. The transaction could then be intercepted and redirected. This threat did not seem realistic before this research.

Google engaged with the U.S. government ahead of publication. 

The team also collaborated with Coinbase, the Stanford Institute for Blockchain Research, and the Ethereum Foundation. The goal was to align on responsible disclosure before going public.

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Industry Must Migrate to Post-Quantum Cryptography by 2029

Google’s paper is direct in its recommendation. 

The industry needs to transition to post-quantum cryptography, or PQC, before quantum computers reach cryptographically relevant scale. 

Google set a 2029 migration timeline and has been advocating for PQC since 2016. The researchers argue that viable PQC solutions already exist. The challenge is implementation speed.

The paper urges Bitcoin and blockchain developers to stop reusing vulnerable wallet addresses. It also recommends avoiding the exposure of public keys where possible. These are short-term steps while longer migration work gets underway. 

Google notes that some experimental PQC deployments are already live on otherwise vulnerable blockchains.

The research warns against underestimating how quickly quantum progress can move. There may be no visible warning signs before a cryptographically relevant quantum computer arrives. 

Google’s paper frames this not as distant speculation but as an active security vulnerability requiring urgent attention.

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