Quantum computers threaten exposed private keys rather than blockchains, Europol warns
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Summary
Europol released a report stating that quantum computers threaten exposed cryptocurrency private keys rather than the blockchains themselves. The agency highlighted that approximately 6.9 million bitcoin are stored in addresses with exposed public keys, which could allow future quantum computers to derive the corresponding private keys and access funds. Although quantum computers capable of such attacks do not yet exist, Europol called for a phased transition to quantum-resistant security measures.
Why it matters
The report emphasizes that the primary risk to cryptocurrencies from quantum computing lies in wallet security, not the integrity of blockchain transaction histories. Europol warns the industry to coordinate a global effort to migrate to quantum-resistant cryptography before exposed wallets become vulnerable, aiming to prevent theft rather than systemic blockchain collapse.
Key context
Europol distinguishes between two cryptographic elements: hash functions securing blockchain history, which remain resistant to quantum attacks, and public-key cryptography securing wallet ownership, which is vulnerable. Early Bitcoin addresses from the "Satoshi era" have exposed public keys visible onchain, increasing risk. A cited 2024 study estimates that converting all unspent transaction outputs to quantum-resistant formats could take nearly a year under optimal block space allocation.
Key numbers and entities
Europol’s European Cybercrime Center authored the report. About 6.9 million bitcoin are held at addresses with exposed public keys. IBM projects significant commercial quantum computing revenue within two to four years. Migration to quantum-resistant cryptography may require 76 to 300 days of block space, depending on reserved capacity. New quantum-resistant signatures can be 10 to 120 times larger than current ECDSA signatures.
What remains unclear
The report does not specify when quantum computers capable of breaking wallet cryptography might become operational. The details of how to coordinate the global migration or manage the debate on freezing potentially vulnerable Satoshi-era wallets remain unresolved. The report also does not address the practical user impact or policy responses beyond urging proactive adaptation.