Bitcoin Faces Quantum Threat: Can It Upgrade Security Before It's Too Late?

While not all aspects of bitcoin are vulnerable to quantum computer attacks, ownership is at risk due to the type of math used to protect wallets. A quantum algorithm known as Shor's can collapse the gap in this math problem, allowing attackers to access wallets. Approximately 6.9 million bitcoin are exposed, including those belonging to the cryptocurrency's pseudonymous creator, Satoshi Nakamoto. The 2021 Taproot upgrade inadvertently expanded the problem by publishing keys for any bitcoin spent since its activation. To address this issue, developers have proposed various solutions, including new quantum-safe address types and a detection system to trigger defensive action in case of a quantum attack. However, these proposals lack broad support, and the network's governance culture, which treats central authority as a failure mode, makes implementing effective solutions challenging. Ethereum, a competing blockchain, has had a formal quantum-resistant program in place since 2018 and has made significant progress in migrating to quantum-safe math. The clock is ticking for bitcoin to prevent a quantum threat, and its ability to coordinate a major security upgrade will determine its future.