Overview
- European banking, securities and insurance supervisors flagged quantum computing as an urgent preparatory priority in their Autumn 2026 risk assessment, calling for stronger readiness across financial and distributed‑ledger systems.
- New Google Quantum AI research this year sharply reduced resource estimates for attacks on 256‑bit elliptic‑curve signatures, raising the prospect that future fault‑tolerant machines could recover private keys from exposed public keys.
- No quantum computer exists today that can break Bitcoin or Ethereum cryptography, but supervisors warn that ‘harvest now, decrypt later’ attacks and faster hardware progress make early migration essential.
- Blockchain projects are moving from planning to concrete steps: the Ethereum Foundation set a December 2029 target for quantum resistance and Bitcoin developers are debating draft BIP‑361 to phase out vulnerable ECDSA and Schnorr signatures.
- Migration will be complex for users and firms because it requires protocol changes, coordinated network upgrades and holders moving funds from addresses with exposed public keys, and Europe’s roadmap asks member states to begin transitions by the end of 2026 with critical systems protected by 2030.