Nic Carter, co-founder of Coin Metrics, has highlighted quantum computing as a significant long-term threat to Bitcoin's cryptographic security. In an essay published on October 20, 2025, Carter detailed how advancements in quantum computing could potentially compromise Bitcoin's public key cryptography, particularly by solving the discrete logarithm problem. He urged the Bitcoin community to focus on developing post-quantum signature schemes and migration strategies to mitigate this risk. Carter also advised practical measures to reduce immediate exposure, such as avoiding address reuse. He stressed the importance of not dismissing the quantum threat as mere science fiction, advocating for proactive steps to safeguard Bitcoin's future security.