The Q-Day Prize challenge, explained: Can quantum computers really break Bitcoin?

Quantum computing firm Project 11 is offering 1 BTC to anyone who can crack a “toy version” of Bitcoin’s cryptography through quantum computing.

The Q-Day Prize is a challenge to make the Bitcoin network quantum resistant.

On April 16, 2025, quantum computing-focused company Project 11 announced the “Q-Day Prize,” a competition to break a “toy version” of Bitcoin’s cryptography with a quantum computer. Contestants must complete the Q-Day Prize challenge by April 5, 2026.

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