Bitcoin Faces Quantum Threat: Can It Coordinate a Security Upgrade to Protect 6.9 Million Coins?

While not all aspects of bitcoin are vulnerable to quantum computer attacks, the ownership of coins is at risk due to the type of math used to protect wallets. Bitcoin mining, which relies on a different kind of math, would remain unaffected. However, the wallets that hold the coins are protected by a math problem that can be solved by quantum computers, potentially allowing attackers to steal coins. Approximately 6.9 million bitcoin, including those held by the network'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. To address the issue, bitcoin developers are exploring solutions, including a proposal to add 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 it challenging to implement effective solutions. In contrast, Ethereum has had a formal quantum-resistant program since 2018 and is making progress in migrating its security to new math that quantum computers cannot break. The question remains whether bitcoin can coordinate a significant security upgrade to protect its users' assets before the threat becomes a reality.