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

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 bitcoin ledger and the rule that new bitcoins can only be created through mining would remain intact in the event of a quantum attack. However, ownership of bitcoins is at risk due to the type of math used to protect bitcoin wallets. This math, known as elliptic curve cryptography, can be broken by a quantum computer using an algorithm called Shor's. A recent paper by Google demonstrated 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 owned by bitcoin's pseudonymous creator Satoshi Nakamoto, are at risk due to exposed public keys. The 2021 Taproot upgrade inadvertently increased the problem by publishing the key protecting remaining bitcoin at an address after a transaction. While there are proposals to address the issue, such as adding new quantum-safe address types or installing a detection system, none have gained broad support from bitcoin's core developers. The lack of a formal governance structure and a culture that resists coordinated change make it challenging for bitcoin to implement effective solutions. In contrast, Ethereum has a formal quantum-resistant program and has made significant progress in migrating to quantum-safe math. The question remains whether bitcoin can coordinate a massive security upgrade before a quantum attack occurs.