Quantum Threat to Bitcoin: Energy Requirements Exceed Those of a Star

A recent study has shed light on the feasibility of using quantum computers to attack the Bitcoin blockchain through mining. The research suggests that such an attack would require an enormous amount of energy, equivalent to that of a star. This finding has led experts to reevaluate the potential threat of quantum computers to Bitcoin's security.

The study found that running Grover's algorithm, a quantum technique that could potentially speed up the trial-and-error search process in mining, against the SHA-256 math formula used by Bitcoin would be physically impossible due to the energy requirements. A quantum 51% attack on Bitcoin mining would require approximately 10^23 qubits drawing 10^25 watts.

Experts emphasize that the threat of quantum computers is not entirely dismissed by this finding, as wallet vulnerabilities remain a significant concern. In fact, a recent paper from researchers at Google suggests that the computing power needed for such an attack could fall sharply, making the encryption that secures the Bitcoin blockchain vulnerable in an attack that takes minutes.