Wu Shuo learned that the official Arc issued a statement saying that after the release of Circle, a quantum-safe white paper was published, proposing a phased security roadmap for Arc, USDC, smart contracts, validators, and infrastructure systems. The white paper states that quantum computing may pose long-term risks to blockchain signatures, validator keys, smart contracts, and network communication. Circle plans to support SLH-DSA signature verification in Arc, and during the transition period, allow USDC smart contracts to continue supporting ECDSA interactions while enabling post-quantum signatures. Circle stated that the final switch time will depend on ecosystem readiness, regulatory requirements, and quantum risk assessments, and the related roadmap may still be adjusted.