Create a Rust project

As smart contracts are Rust library crates, we will start with creating one:

$ cargo new --lib ./empty-contract

You created a simple Rust library, but it is not yet ready to be a smart contract. The first thing to do is to update the Cargo.toml file:

name = "contract"
version = "0.1.0"
edition = "2021"

crate-type = ["cdylib"]

cosmwasm-std = { version = "1.0.0-beta8", features = ["staking"] }

As you can see, I added a crate-type field for the library section. Generating the cdylib is required to create a proper web assembly binary. The downside of this is that such a library cannot be used as a dependency for other Rust crates - for now, it is not needed, but later we will show how to approach reusing contracts as dependencies.

Additionally, there is one core dependency for smart contracts: the cosmwasm-std. This crate is a standard library for smart contracts. It provides essential utilities for communication with the outside world and a couple of helper functions and types. Every smart contract we will build will use this dependency.