Will Quantum Computers Break Bitcoin? What's Real in 2026
An IBM Quantum System One being installed at Fraunhofer in Ehningen, Germany. Photo: IBM Research / Wikimedia Commons , CC BY 2.0 . Every few months a headline warns that quantum computers are about to "crack Bitcoin." In 2026 the topic got more serious attention, because Google's quantum team published new research showing that the cryptography behind Bitcoin could, in theory, be broken with fewer resources than earlier estimates suggested. That is worth understanding. But "could, in theory, on a machine that does not exist yet" is very different from "your coins are at risk tomorrow." This guide explains, in plain language, what quantum computers could and could not do to Bitcoin, what the developer community is working on, and what a beginner in Europe can sensibly do today. It is also the first post in our new quantum computing section. Important disclaimer This is not financial advice. Cryptocurrency is volatile and you can lose money. This a...