Cross-chain token standards enable fungible tokens that exist across multiple blockchains with a unified total supply model. This paper presents a comprehensive comparative analysis of five leading cross-chain token standards and frameworks: the xERC20 standard (implementing ERC-7281), the Omnichain Fungible Token (OFT) standard, the Native Token Transfers (NTT) framework, the Cross-Chain Token (CCT) standard, and the SuperchainERC20 standard (implementing ERC-7802). We examine each standard's distinguishing properties and technical design, including architecture, message-passing mechanisms, interoperability scope, chain compatibility, and security features. Our analysis reveals that while all these standards share the goal of seamless cross-chain fungibility, they differ significantly in implementation approach, trust model, and target ecosystem.

翻译：跨链代币标准使得同质化代币能够在多条区块链上存在，并采用统一的总供应量模型。本文对五种主流的跨链代币标准与框架进行了全面的比较分析：xERC20标准（实现ERC-7281）、全链同质化代币（OFT）标准、原生代币转移（NTT）框架、跨链代币（CCT）标准以及SuperchainERC20标准（实现ERC-7802）。我们考察了各标准的显著特性与技术设计，包括架构、消息传递机制、互操作性范围、链兼容性及安全特性。分析表明，尽管这些标准均以实现无缝跨链同质化为共同目标，但在实现方式、信任模型和目标生态系统方面存在显著差异。