Adam Back Says Quantum Threat To Bitcoin Is Decades Away

Blockstream CEO Adam Back recently addressed concerns regarding the potential threat of quantum computing to Bitcoin’s cryptographic security. In an interview with Bloomberg, Back emphasized that current progress in the field of quantum computing is still in its early stages and far from being able to break real-world encryption.

Back highlighted the limited capabilities of existing quantum hardware, which often lack full error correction and have only demonstrated trivial computations. He pointed out that the most significant calculation performed by these machines is factoring the number 21 into 7 times 3, indicating that they are more akin to laboratory prototypes than practical computing systems.

While recent academic research has shown potential algorithmic improvements, Back argued that these advancements do not yet translate into meaningful hardware capability. He suggested that quantum computers capable of threatening Bitcoin’s elliptic curve cryptography are still “decades off,” although he acknowledged the uncertainty surrounding exact timelines.

Despite the long timeline for quantum computing risks, Back urged the Bitcoin ecosystem to start preparing now. He recommended a gradual migration path towards quantum-resistant signature schemes to allow users and custodians enough time to update keys and infrastructure without disruption. Back mentioned that Blockstream’s research team has been actively working on post-quantum approaches and has already contributed implementations to Liquid, a Bitcoin layer-two network known for testing new features.

Back also referred to recent progress in standardization efforts, such as the National Institute of Standards and Technology’s approval of post-quantum cryptography standards in late 2024, as a significant milestone that could accelerate industry adoption.

In addition to quantum computing, Back addressed concerns about artificial intelligence (AI) posing structural risks to Bitcoin. He characterized AI as a productivity tool that can assist researchers and engineers, rather than compromising cryptographic systems.

Shifting focus to Bitcoin’s global role, Back described the asset as “digital gold,” coexisting alongside national monetary systems instead of replacing them. He highlighted the growing sovereign interest in Bitcoin, citing discussions in countries like El Salvador about national reserves and monetary frameworks. Back also mentioned ongoing debates in Switzerland regarding monetary reform and the historical appeal of gold-backed standards.

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