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

Not all aspects of bitcoin are vulnerable to quantum computers. The blockchain itself and the rule that new bitcoins can only be created through mining would remain intact in the event of a quantum attack. However, ownership is a different matter. Bitcoin wallets rely on a type of mathematics that converts a private key into a public address. This math works in one direction but not the other, which is what prevents unauthorized access to coins. A quantum algorithm known as Shor's algorithm can compromise this security. Google recently published a paper demonstrating that such an attack could be carried out with fewer resources than previously thought, highlighting the urgency of the situation. Approximately 6.9 million bitcoins, including those held by bitcoin's pseudonymous creator Satoshi Nakamoto, are at risk due to exposed public keys. The 2021 Taproot upgrade inadvertently exacerbated the issue by publishing keys for any bitcoin spent since its activation. While there are proposals to address the quantum threat, such as BIP-360 and a detection system from BitMEX Research, none have gained broad support from bitcoin's core developers. The lack of a formal governance process and central authority makes it challenging for bitcoin to coordinate a response. Ethereum, on the other hand, has been working on a quantum-resistant program since 2018 and has made significant progress. The question remains whether bitcoin can implement effective solutions before the threat becomes a reality.