The notion that quantum computers could compromise the security of the bitcoin network has sparked widespread concern, but according to recent academic studies, the actual threat may be more nuanced. Two papers, one focusing on the energy requirements for a quantum mining attack and the other debunking exaggerated claims of quantum factoring breakthroughs, provide a more measured assessment of the risks. The first paper calculates that a quantum computer capable of out-mining the current bitcoin network would require an enormous amount of energy, comparable to that of a star, rendering such an attack physically unfeasible.
The second paper demonstrates that many purported quantum factoring breakthroughs are based on artificially simplified problems, and that these achievements can often be replicated using outdated computers or even manual calculations. While the threat of quantum computers to bitcoin's security is real, it primarily concerns wallet security rather than mining, with millions of bitcoins stored in vulnerable addresses.
However, developers are working on solutions to mitigate these risks, including new signature types and key management strategies. Ultimately, the quantum threat to bitcoin, although genuine, is constrained by physical limitations and is not as imminent as some headlines suggest.