Endgame with Amanda Cassatt The Quantum Threat to Bitcoin, Ethereum, and DeFi with John Lilic & Stefano Gogioso
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Jun 3, 2025 John Lilic, an investor and early Ethereum adopter focused on crypto risks, and Stefano Gogioso, an Oxford quantum computing researcher, explore Q-Day and the quantum threat to blockchain. They explain quantum vs classical cryptography. They debate timelines, stablecoin and DeFi panic risks, and what measurable signals to watch as the technology advances.
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Quantum Could Undo Today's Crypto Security
- Quantum computers will break most current public-key cryptography, enabling an attacker to sign any transaction and potentially wipe out crypto value until patched.
- Stefano warns this could happen within a decade if industry roadmaps continue on their current curves, making the threat nearer than it feels.
Act Now To Avoid A Stablecoin Stampede
- Prepare for market-driven panic: expect a stampede if a quantum company demonstrably breaks a small ECC instance or reaches a clear milestone.
- John recommends assessing stablecoin and exchange upgrade capabilities now because institutional capital could exit on loss of confidence.
Public Key Crypto Is The Weak Link
- Asymmetric (public-key) cryptography like ECDSA is uniquely vulnerable to quantum attacks, while symmetric schemes are harder-hit but less exposed.
- Stefano explains quantum breaks public-key steps used in handshakes and signatures, making many stored communications decryptable later.