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

While not all aspects of bitcoin are vulnerable to quantum attacks, the ownership of coins is at significant risk. Bitcoin mining, which involves adding new blocks to the blockchain, uses a type of math called hashing that is resistant to quantum computer attacks. However, the math that protects bitcoin wallets, turning a private key into a public address, is a different story. A quantum algorithm known as Shor's can potentially break this math, allowing an attacker to access the private key and steal the coins. Approximately 6.9 million bitcoin, including those owned by bitcoin's creator Satoshi Nakamoto, are at risk due to exposed public keys. The 2021 Taproot upgrade inadvertently increased this risk by publishing the key protecting remaining coins at an address after a transaction. While there are proposals to address this issue, such as adding quantum-safe address types or installing a detection system, none have gained broad support from bitcoin's core developers. Ethereum, on the other hand, has had a formal quantum-resistant program in place since 2018 and is actively working on migrating to new math that quantum computers cannot break. The challenge for bitcoin lies in its governance structure, which makes it difficult to coordinate and implement significant changes. With the threat of quantum attacks looming, the question remains whether bitcoin can overcome its structural hurdles to protect its users' coins.