Time Running Out for Bitcoin to Counter Quantum Threat, 6.9 Million BTC at Risk

Not all aspects of bitcoin are vulnerable to quantum computers. The process of bitcoin mining, which utilizes a type of math known as hashing, is secure against quantum attacks. The blockchain ledger and the rule that new bitcoin can only be created through mining would remain intact in the event of a quantum attack. However, ownership is a different story. Bitcoin wallets rely on a type of math that converts a private key into a public address, and this is the weak point that quantum computers can exploit. A quantum algorithm known as Shor's can reverse this process, potentially allowing attackers to access and drain wallets. Approximately 6.9 million bitcoin, or about one-third of all mined bitcoin, is at risk due to exposed public keys. This includes bitcoin held by the network's pseudonymous creator, Satoshi Nakamoto. The 2021 Taproot upgrade inadvertently increased the problem by publishing keys for any spent bitcoin. While other blockchains like Ethereum are actively preparing for the quantum threat, Bitcoin developers have yet to propose a concrete solution. Ethereum has had a formal quantum-resistant program in place since 2018 and is actively working on migrating its security to quantum-resistant math. In contrast, Bitcoin's development culture, which prioritizes decentralization and avoids central authority, makes it harder to coordinate a response to the quantum threat. The lack of a foundation to fund engineering work and a governance process for passing major upgrades exacerbates the issue. As a result, the question remains whether Bitcoin can coordinate the necessary security upgrades before the threat becomes a reality.