Quantum Threat to Bitcoin Grows More Pressing as Researchers Warn of Potential Catastrophe

The threat of quantum computers breaking Bitcoin's cryptography has been a concern for some time, but recent research suggests that it may be closer than expected. A powerful enough machine could crack older addresses and expose billions in vulnerable wallets.

Bitcoin's signatures use elliptic-curve cryptography, which can be broken by a sufficiently powerful quantum computer using Shor's algorithm. This means that any address that has ever revealed a public key is at risk of being compromised. The biggest concern is abandoned coins, worth around $180 billion, including roughly $100 billion believed to be Satoshi's.

Developers are working on proposals to address the risk through freezing quantum-vulnerable coins and migrating vulnerable funds. One proposal, BIP-361, would phase out the network's existing signature schemes and freeze coins that fail to migrate to quantum-resistant addresses. Another proposal, QRAMP, would move vulnerable UTXOs to quantum-safe addresses through a hard fork.

The community is divided on how to address the risk, with some advocating for mandatory migration plans and others arguing for optional upgrades. However, experts warn that any delay in addressing the issue could lead to panic and premature market reactions, which could shake confidence before any code fails.