Circle has released a white paper on post-quantum security, planning to support post-quantum signatures when the Arc mainnet launches.

According to Mars Finance, Circle has released a "Post-Quantum Security White Paper," outlining a phased post-quantum resilience roadmap for the long-term security of the Arc blockchain ecosystem. This roadmap covers multiple technical areas, including quantum-secure signatures, private execution environments, validator hardening, infrastructure migration, and account recovery, and is applicable to core components such as the Arc network, USDC, smart contracts, and validators. Circle stated that it plans to provide post-quantum signature support upon the Arc mainnet launch (2026) to enhance the ecosystem's ability to cope with future quantum computing threats.