Circle has released a white paper on post-quantum security, outlining a phased roadmap to enhance the long-term security of the Arc blockchain ecosystem. According to Foresight News, the roadmap includes various technical directions such as quantum-safe signatures, private execution environments, validator hardening, infrastructure migration, and account recovery. These measures are intended for key components like the Arc network, USDC, smart contracts, and validators. The plan aims to provide post-quantum signature support by the time the Arc mainnet launches in 2026.