A new research paper from Google Quantum AI has accidentally revealed ahead of time how quantum computers will require just minutes to break the cryptographic systems that encrypt Bitcoin, Ethereum, and every other cryptocurrency.
The study, titled “Securing Elliptic Curve Cryptocurrencies against Quantum Vulnerabilities: Resource Estimates and Mitigations,” was published on March 30, 2026, by researchers from Google Quantum AI.
A tech expert stationed in Seattle shared this information with ProPakistani. He said most of the data has not been published because the experiment shows how easy it will be to break encrypted blockchains in the near future.
The Threat Has Now Been Technically Defined
The paper examines how cryptographically relevant quantum computers (CRQCs) could exploit weaknesses in the mathematical backbone protecting blockchain wallets and transactions.
Using improved resource estimates, researchers showed that Shor’s algorithm could theoretically break the 256-bit elliptic curve discrete logarithm problem (secp256k1), the same cryptographic system used by Bitcoin and Ethereum, with roughly 1,200 logical qubits.
Previous assumptions suggested millions of qubits would be required.
Under certain superconducting quantum architectures with low error rates, the coders estimated that such an attack could run using fewer than 500,000 physical qubits, a scale not yet achieved but now considered technically plausible.
The ‘Mempool’ Risk
One of the study’s most notable findings involves a potential “on-spend” quantum attack.
When a Bitcoin transaction is broadcast to the network, the public key becomes temporarily visible in the mempool before confirmation.
The researchers found that a sufficiently powerful quantum computer could theoretically derive the private key from that exposed public key within minutes and allow attackers to redirect funds before a transaction is finalized.
The team validated their findings using zero-knowledge proofs but deliberately avoided publishing operational attack details out of fear that someone would develop the chaotic tool.
Immediate Danger?
The researchers still wrote that cryptocurrencies are not currently vulnerable.
Today’s most advanced quantum computers operate with only thousands of physical qubits, which is far below the hundreds of thousands required to execute the above-mentioned hack. The study therefore represents a roadmap of future risk, but that time could be nearer than most expect.
Call for Post-Quantum Security
The paper warns that quantum computing could eventually create systemic risks across blockchain ecosystems, particularly for:
- exposed public keys in transactions,
- smart contracts,
- proof-of-stake consensus systems,
- and dormant/abandoned crypto wallets.
Researchers have warned cryptocurrency developers and communities to begin migrating toward post-quantum cryptography (PQC) standards to get more secure.
What to Expect so far?
While no cryptocurrency has been hacked using quantum computing to date, the study actually gives the clearest scientific theorem for breaking blockchain encryption.
The challenge has shifted from mathematical possibility to engineering progress. Give it a few years. Most X analysts bet big on 2030.
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