Overview
- Google research and follow-up analysis have shortened the expected arrival of quantum machines that could break elliptic‑curve keys to around 2029, compressing the timeline for when blockchains may become vulnerable.
- President Trump signed Executive Order 14412 on June 22 directing federal systems to adopt NIST‑approved post‑quantum cryptography by 2030–2031, which is forcing vendors and networks to align on standards and schedules.
- Experts warn of 'harvest now, decrypt later' attacks where adversaries record public blockchain data today to decrypt it once quantum capability exists, and an unpublished June working paper estimates roughly 35% of Bitcoin supply could be exposed.
- Some projects are publishing roadmaps and starting migrations — the Ethereum Foundation formed a Post‑Quantum team and targets protection by 2029 while Algorand published a roadmap and plans post‑quantum accounts later this year — but no top‑20 chain has yet deployed post‑quantum signatures.
- Moving to post‑quantum signatures creates hard trade‑offs: larger keys and signatures increase storage, bandwidth and processing costs, complicate upgrades on fixed‑size blockchains, and have spurred startups and vendors such as QIZ Security to raise funds and build migration tools.