Bitcoin faces a quantum threat. Google says post-quantum migration is needed by 2029.

Google just set a 2029 deadline to migrate its authentication services to post-quantum cryptography. That means Bitcoin devs now have less than five years to upgrade the network before quantum computers can break ECDSA signatures and steal funds.

Why it matters:

• Google's timeline is not a guess — it's based on real hardware progress and error correction breakthroughs

• Ethereum has been working on PQ migration since 2018 and already has a public roadmap with fork-level milestones

• Bitcoin still has no coordinated plan, no multi-team effort, and no clear migration strategy

The market is watching. If Bitcoin can't deliver a quantum-resistant upgrade before 2029, ETHBTC could start reflecting the gap in urgency. Some analysts say only ~10,200 BTC in vulnerable legacy addresses could cause "appreciable market disruption" if stolen.

This isn't about if quantum computing will break Bitcoin — it's about whether the network can upgrade in time.

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