Circle has released a whitepaper detailing its strategy to safeguard USDC and the upcoming Arc blockchain against potential quantum computing threats. The plan outlines a phased approach to transition from current cryptographic methods to post-quantum security measures. Circle assures users that funds will remain accessible even if they haven't migrated to post-quantum protections before quantum attacks become feasible. The whitepaper highlights the risks posed by quantum computers, which could potentially break elliptic curve cryptography, threatening wallet signatures, validator keys, and smart-contract integrity. Circle's roadmap includes identifying vulnerable systems, running legacy and post-quantum cryptography concurrently, and eventually retiring classical signature schemes. Arc will launch with built-in post-quantum defenses, including SLH-DSA and encrypted communications. Circle emphasizes the need for the industry to prepare for quantum threats, despite conventional cybersecurity risks being more immediate. The whitepaper marks a shift from theoretical discussions to actionable strategies for post-quantum resilience, addressing challenges like immutable contracts and chain history protection.