Introduction
ink! is a programming language for smart contracts.
It's a domain-specific Rust language: contracts are normal Rust code.
We decided on Rust as it provides inherent safety-guarantees and a great performance. This translates to low user fees and makes it an ideal choice for scalable smart contracts.
You can use all the normal Rust tooling ‒ clippy, crates.io, IDE’s, etc.
Interoperability with Solidity contracts: Solidity developers can cross-contract call ink! contracts as if they were Solidity contracts.
You can deploy ink! to blockchains built with Polkadot SDK. See here for a list of chains that support us.
Fast Track
Install Rust and cargo: Installation Guide.
Download the binary for a local development node here.
# Install our cli tool.
# It wraps around `cargo build` to build contracts with optimal
# flags for blockchains. It also allows for deploying + interacting
# with contracts.
cargo install cargo-contract
# Create a simple contract.
cargo contract new flipper && cd flipper
cargo contract build --release
# Instantiate this contract on-chain.
cargo contract instantiate --suri //Alice
# Dry-run a call of it.
cargo contract call --suri //Alice --contract 0x… --message get
# Execute a contract call, as a transaction on-chain.
cargo contract call --suri //Alice --contract 0x… --message flip -x
Smart Contract Examples
Our "Hello, World!".
» view example
An ERC-20 implementation.
» view example
An upgradeable contract.
» view example
A multi-signature wallet.
» view example
Allow runtime access.
» view example