34% of Bitcoin Addresses Are at Risk — The Structural Weakness Quantum Computers Could Break
Bitcoin’s Quantum Vulnerabilities, BIP‑361, and ZK-Based Alternatives ※ This post is an initial version and will be updated to the final Daily Crypto Times (DCT) format in 2 days. As the era of quantum computing approaches faster than many expected, the fundamental security model of Bitcoin is back in the spotlight. BIP‑361, recently proposed by Bitcoin developers, is not a minor technical tweak but the first concrete attempt to address a structural issue: more than 34% of all Bitcoin may be exposed to quantum attacks . To understand what this proposal really means, we need clear answers to a few key questions: Why are all addresses that have been used at least once considered quantum-vulnerable? How does Bitcoin’s transaction structure actually expose public keys? What exactly does BIP‑361 aim to change? Beyond PQ signatures, is a ZK-based alternative realistically possible? This article tackles precisely those questions. We walk through how Bitcoin...