Circle Internet Financial provides a comprehensive guide on the distinctions and migration processes between bridged USDC and native USDC, emphasizing the advantages of native USDC. Bridged USDC is a synthetic version created when USDC is locked on one blockchain and minted on another through third-party applications, while native USDC is issued directly by Circle, fully backed, and maintains a 1:1 redemption ratio with US dollars. The guide outlines best practices for supporting both types in user interfaces, such as clearly labeling them and ensuring correct token addresses. Developers are encouraged to facilitate the migration to native USDC on zkSync Mainnet using swapping mechanisms or DeFi protocols, with native USDC being positioned as the default option due to its reliability and support from Circle's APIs. The document also provides guidance on accessing native USDC and highlights the benefits of using it over bridged USDC, while also mentioning related updates and future developments within the Circle ecosystem.