Turns Out Bitcoin Already Fessed Up to Quantum Anxiety — And Sold Off Accordingly

Bitcoin's recent selloff has priced in quantum computing fears, according to Bernstein — and yes, there's still time to do something about it. The analyst firm noted Monday that Bitcoin's near-50% drawdown from its $126,198 all-time high in October 2025 reflects market participants getting ahead of quantum-related risks. The note argues that while the threat is real, it's not exactly pressing the panic button just yet. Turns out the market was pricing in more than just ETF flows this time.

This comes two weeks after Google researchers suggested future quantum computers could break the elliptic-curve cryptography underpinning many blockchains with fewer than 500,000 physical qubits. Under theoretical conditions, a quantum machine could crack a Bitcoin private key in just nine minutes — faster than Bitcoin's 10-minute block production window. Yes, you read that correctly. Nine minutes. Bitcoin miners everywhere just felt a chill run down their spines.

So when does the quantum sword drop? Bernstein estimates Bitcoin has roughly three to five years to implement a post-quantum upgrade path, though developers apparently aren't sweating it yet. Apparently the same developers who can't agree on a block size have a few years to solve the entire cryptographic backbone of the network. No pressure.

"We expect institutional partners with now billions at stake to play a constructive role in building consensus on the post-quantum path," Bernstein noted. Because when has "institutional partners" ever complicated a simple technical upgrade process?

The firm's note flagged the recently introduced BIP-360 proposal, which proposes a Pay-to-Merkle-Root output type to reduce long-exposure quantum risk by addressing Taproot's key-path vulnerability. Implementing BIP-360 as a soft fork could help, but roughly 8% of Bitcoin's supply locked in inactive addresses would still remain vulnerable to future quantum breakthroughs. That 8% includes a bunch of Satoshi-era coins that have been sitting dormant since before your favorite influencer knew what a blockchain was.

Here's the kicker: quantum-proofing Bitcoin isn't actually a technical nightmare — it's a social one. The code is apparently the easy part. Who knew that securing the world's largest monetary network would come down to getting people to click a few buttons