Europol Quantum Crypto Security Report: Exposed Wallet Keys, Not a Live Hack

Europols European Cybercrime Centre published Quantum Computing and Cryptocurrencies — Bridging Technical Expertise and Decision-Making on October 7, 2026. The report separates a genuine future cryptographic weakness from exaggerated claims that a quantum computer can already empty ordinary wallets or rewrite a blockchain.　　The main threat concerns public-key signatures that prove ownership of cryptocurrency, not an instantaneous failure of every hash function used by Bitcoin or Ethereum. Europol says machines capable of carrying out the relevant attacks do not yet exist, and it gives no reliable arrival date. Nevertheless, it urges exchanges, wallet developers, custodians and blockchain communities to begin coordinated migration planning before that capability exists.What quantum computing could eventually break　　Much of todays cryptocurrency custody uses public-key cryptography. A holder proves the right to spend by signing with a private key corresponding to a public key. A sufficiently capable error-corrected quantum computer could, in theory, run algorithms that recover certain classical private keys from exposed public keys. The economic result would be unauthorized signing and transfer, not necessarily a failure of the chains block-production history.Why hashing is broken is the wrong headline　　Hash functions and public-key signatures have different properties under known quantum algorithms. Hashes may suffer security-margin reductions in some