Today, Bitcoin Policy Institute and a broad coalition from across the digital-asset ecosystem are publishing an open letter calling on the world’s leading AI labs to provide qualified open-source defenders with trusted access to frontier AI models. The past several weeks have made the need for this abundantly clear. The people defending digital-asset infrastructure and open-source software need access to the latest AI capabilities to perform comprehensive security reviews and stay ahead of increasingly sophisticated adversaries. The coalition includes open-source development organizations, major custodians, treasury companies, payment services, security firms, capital allocators, and others whose businesses and customers depend on the integrity of open-source infrastructure and libraries. Open-source defenders often occupy the least privileged position in the AI security landscape. They have limited access to the strongest internal cyber models and are frequently blocked by guardrails when using publicly available frontier systems for legitimate security research. As a result, they often resort to less capable open-weight alternatives. We are urging frontier AI labs to establish a clear, trusted pathway for qualified open-source and digital asset defenders to access their strongest capabilities, with sufficient compute and secure environments to conduct meaningful security reviews. Frontier AI could become one of the most powerful defensive technologies ever developed, but only if defenders get fair access to those systems. It’s time to give defenders the tools they deserve. Read the open letter, add your organization, or sign as an individual on our website at btcpolicy.org/ailetter