Quantum computers are coming for bitcoin
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Quantum computing advances are raising urgent concerns about the security of cryptocurrency networks. Google's research suggests quantum computers capable of breaking elliptic-curve cryptography — the foundation of most blockchains — could arrive as early as 2029, far sooner than previously expected. Roughly 35–50% of Bitcoin's circulating supply may be exposed to quantum attacks due to visible public keys. No top-20 blockchain has yet implemented post-quantum cryptography, though Ethereum is targeting 2029 and Algorand has published a post-quantum roadmap. The transition is compared to Y2K in scale and complexity, complicated by decentralized governance, larger signature sizes, and the still-evolving state of post-quantum standards.
