Fidelity Warns of Potential Quantum Computing Threat to Bitcoin's Security
Fidelity Digital Assets has released a report highlighting the long-term risk that quantum computers could break Bitcoin’s cryptographic security. Currently, Bitcoin uses digital signatures based on elliptic curve cryptography, which are secure against today’s computing power but vulnerable to future advancements in quantum technology. The firm emphasizes that while cryptographically relevant quantum computers do not yet exist, preparing for this threat is crucial now rather than later. The report discusses a proposed solution called SHRINCS, developed by Blockstream, which introduces quantum-resistant signature schemes into Bitcoin's protocol through an upgrade known as a soft fork. Fidelity acknowledges the trade-offs involved in implementing these new signatures—larger data sizes could reduce network throughput—but notes that current low transaction volumes may mitigate this issue. The report suggests urgency from developers if credible threats emerge, which could help drive consensus for necessary upgrades.
