Explore the development of Owi, an OCaml-based interpreter and toolkit for WebAssembly (Wasm), in this 26-minute conference talk from OCaML'23. Discover how Owi provides a fast and easily maintainable solution for Wasm code execution, with a focus on facilitating experimentation, research, and symbolic manipulations. Learn about the different passes and intermediate representations of Owi, as well as its linker, interpreter, and support for various Wasm-specific extensions. Understand how Owi's API leverages Generalized Algebraic Data Types (GADTs) for improved error detection at link-time. Gain insights into the testing methods employed, including a Crowbar-based fuzzer. Consider the future developments planned for Owi, such as incorporating missing Wasm extensions, implementing advanced optimization passes, and potentially porting the WASP execution engine for concolic execution.