TokenScript is a JavaScript/WebAssembly/XML framework to improve the functionality, security, and usability of blockchain tokens in a myriad of ways. It allows token issuers and other trusted authorities to enrich a given token with a comprehensive set of information, rules, and functionalities. With TokenScript, wallets, and web services can easily, securely, and privately embed a token with all its functions, both on-chain, and off-chain, without the need to understand the underlying smart contract.