Environment Setup

Supported Operating Systems

The Phat Contract uses Rust-based ink! language, and is finally compiled to WebAssembly (WASM for short).

  • You can get your contract compiled on both macOS and Linux distributions (we use Ubuntu 20.04 as the default Linux distribution);
  • For Windows users, we recommend to setup a Linux development environment with virtual machine (video tutorial).

Install Toolchains

Phat Contract shares the exact same toolchains as ink!.


A prerequisite for compiling Phat Contracts is to have Rust and Cargo (Rust’s project manager) installed.

The Rust official recommends to use rustup tool to install and manage different Rust versions. Here’s an installation guide.


We recommend installing cargo-contract. It’s a CLI tool which helps set up and manage contracts written with ink!.

As a pre-requisite for the tool you need to install the binaryen package, which is used to optimize the WebAssembly bytecode of the contract.

  • For macOS users, we recommend to install it with Homebrew package manager.
    brew install binaryen
  • For Ubuntu users, we recommend to download the latest release since apt can get you outdated version.

Then you can install the cargo-contract with

# install Rust nightly toolchain for contract compilation
rustup install nightly
rustup component add rust-src --toolchain nightly
# install cargo-contract tool
cargo install cargo-dylint dylint-link
# use the `--force` to ensure you are updated to the most recent version
cargo install cargo-contract --force

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