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WebAssembly (Wasm)

WebAssembly is used in Polkadot and Substrate as the compilation target for the runtime.

What is WebAssembly?

WebAssembly (abbreviated Wasm) is a binary instruction format for a stack-based virtual machine. Wasm is designed as a portable target for compilation of high-level languages like C/C++/Rust, enabling deployment on the web for client and server applications.


  • - WebAssembly homepage that contains a link to the spec.
  • Wasmi - WebAssembly interpreter written in Rust.
  • Parity Wasm - WebAssembly serialization/deserialization in Rust.
  • Wasm utils - Collection of Wasm utilities used in Parity and Wasm contract development.