Google Sounds Alarm: Quantum Computers Could Steal Your Bitcoin by 2026

Many experts are now warning that quantum computers could one day break Bitcoin’s security. The threat was once considered theoretical, but by 2026 it’s become a serious topic across the tech and finance industries. Industry leaders like Christopher Wood at Jefferies have even cited quantum risks as a reason to question Bitcoin’s long-term future.

The main danger comes from something called Shor’s Algorithm. It’s a method that quantum computers could use to crack the encryption protecting Bitcoin wallets. Bitcoin relies on a system called ECDSA to secure private keys. A powerful enough quantum computer could work backward from public data on the blockchain and steal those keys without any direct hack.

Another algorithm called Grover’s Algorithm could also give quantum-powered miners an unfair advantage in Bitcoin mining. Experts say fast quantum computers could even intercept transactions in real time.

Right now, quantum computers aren’t strong enough to do any of this. Current machines are still in a “noisy” stage, meaning they make too many errors to be useful for breaking encryption. Most experts believe it’ll take at least another 10 years before quantum computers become truly dangerous. However, those timelines have been moving up faster than expected.

The vulnerability is already real for some Bitcoin holders. Around 25% to 30% of all Bitcoin, roughly 4 million coins, is stored in addresses where public keys have already been exposed. That puts over $100 billion worth of Bitcoin at higher risk. Reusing wallet addresses makes the problem even worse.

The good news is that solutions are being developed. A proposed upgrade called Quantum-Safe Taproot would use a different type of math called lattice-based encryption to protect Bitcoin. Some hot wallet providers have already announced quantum-level security features. Bitcoin’s quantum testnets began testing NIST-standardized post-quantum cryptography algorithms as early as January 2026.

The race between quantum threats and quantum defenses is now fully underway. Popular post-quantum schemes being explored in the Bitcoin community include Dilithium and Falcon, which rely on complex lattice-based problems that even quantum computers struggle to solve. Timothy Hollebeek from DigiCert has said quantum computer development isn’t a matter of “if” but “when.” The Bitcoin community’s response to that reality will likely shape the cryptocurrency’s future in the years ahead.