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Introduction to the Wasm VM for ISC


The Wasm VM is in experimental state, showcasing ISC's "VM plugin" architecture.

Experiment but avoid using it for production applications; opt for EVM.


Smart Contracts are currently only compatible with the Stardust protocol and therefore only compatible with the Shimmer and Public Testnet networks.

IOTA Smart Contracts (ISC) provide a sandboxed environment through an API, facilitating secure and deterministic interactions with ISC functions. This API supports any Virtual Machine (VM) aiming to build a system for smart contract code execution on ISC.

Wasp node ISC Host

We offer a VM example utilizing WebAssembly (Wasm) as a compilation target, facilitated by the open-source Wasmtime runtime. This setup encourages dynamic smart contract operations compiled to Wasm code, promoting security and adaptability with different programming languages.

Wasm VM

The Wasm VM operates with self-contained WasmLib libraries linked to individual Wasm codes, optimizing the ISC sandbox functionality and smart contract state storage access.

Supported Functionalities

The ISC sandbox environment offers:

  • Smart contract metadata and state data access
  • Request data retrieval for function calls
  • Token management within the contract
  • Utility functions from the host
  • Smooth initiation of other smart contract functions
  • Logging facility

Supported Languages

The WasmLib started with Rust support, expanding to include Go and TypeScript with the help of respective Wasm code generators:

LanguageWasm code generator

These generators maintain a common subset of their host language, aiming for a unified coding style to simplify the initiation into smart contract creation, welcoming developers with a C-style language background to quickly adapt.

Video Tutorial