Bitcoin Developer Proposes Collateral-Based Defense Against Quantum Attacks

quantum attacks — A Bitcoin Core developer has proposed a novel protocol-level defense designed to make quantum computer attacks on the Bitcoin network a financially losing proposition for any potential attacker.

The concept, outlined by developer Cory Fields, would require a future quantum attacker to post a significant amount of Bitcoin as collateral before attempting to steal funds from vulnerable wallets. This mechanism is designed to give prepared wallet owners a window of opportunity to move their funds to safety and, in the process, claim the attacker’s posted collateral as a penalty.

The proposal aims to address the long-term cryptographic threat posed by quantum computing, which could theoretically break the elliptic-curve cryptography used to secure Bitcoin wallets. By imposing a high financial cost, the system would disincentivize attacks even after the underlying cryptographic assumptions are broken.

Fields’s idea is a forward-looking contingency plan, not an immediate software update. It represents a proactive approach to a threat that the broader crypto industry is increasingly researching, though practical, large-scale quantum computers capable of such attacks are not expected for years.