According to Blockstream CEO Adam Back, the threat of quantum computing to the Bitcoin network is theoretically real but not immediately pressing. Back, a pioneering figure in Bitcoin's history due to his cryptographic work dating back to the 1990s, emphasized the importance of preparing for this potential risk.
In a recent interview with Bloomberg, Back pointed out that current quantum hardware lacks error correction, aligning with the findings of two recent papers that approach the issue from different perspectives. These papers collectively suggest that quantum computing poses a long-term rather than an imminent threat to cryptographic systems. Back's central argument is not about dismissing the threat but about the timing of the response.
He stressed that it is prudent to prepare Bitcoin for a potential quantum threat by giving users the option to migrate their keys to a quantum-resistant format, allowing for a gradual transition over the course of a decade. This timeline is in line with the progression of post-quantum cryptography from theoretical concepts to practical implementation, particularly following the standardization by NIST in late 2024. Back highlighted that active preparation is already underway across the ecosystem, including a dedicated 20-person research team working on publishing papers, implementing solutions, and deploying them. The Liquid network by Blockstream is cited as an early example of such efforts.
The main challenge for the industry is not reacting to a sudden breakthrough but rather coordinating a slow and orderly migration to mitigate the risk before it becomes critical.