When Could Quantum Computers or AI Break Bitcoin? An Updated Threat Window

The conversation centers on whether blockchain cryptography could face a practical break from quantum computing before or alongside attacks powered by AI. The host opens by citing Justin Drake’s warning that ECDSA could fail before Q-Day, possibly “in months,” and asks for an updated view after new Google and Quantinuum advances in quantum error correction.

One guest says those results do not change the core Q-Day estimate, but they do strengthen the case that quantum computing progress is real engineering rather than just theory. He keeps his earliest realistic quantum attack window around 2030, with 2033 to 2035 still the more likely range, while saying the new results make an earlier arrival somewhat more plausible. He also says he would still be shocked if quantum computers existed by the end of the decade.

The other guest argues that the post-quantum and post-AI migrations are effectively the same work. He says AI attacks are already here in the sense that schemes are being broken today, even if not major production schemes yet, and that teams should begin an orderly migration now. His view is that moving to hash-based, crypto-agile schemes can address both threats at once.