Read the official Sway documentation.
Fuel is an operating system purpose built for Ethereum Rollups. Fuel allows rollups to solve for PSI (parallelization, state minimized execution, interoperability) without making any sacrifices.
Here is how we do it:
The FuelVM learns from the Ethereum ecosystem. It implements improvements suggested to the Ethereum VM (EVM) for many years that couldn’t be implemented due to the need to maintain backward compatibility, including parallel transaction execution and multiple native assets.
Fuel delivers unmatched processing capacity through its ability to execute transactions in parallel by using strict state access lists in the form of a UTXO model. With the FuelVM, Fuel full nodes identify the accounts a transaction touches, mapping out dependencies before execution. This enables Fuel to use far more threads and cores of your CPU that are typically idle in single-threaded blockchains. As a result, Fuel can deliver far more compute, state accesses, and transactional throughput than its single-threaded counterparts.
Fuel provides a powerful and sleek developer experience with our own domain-specific language (DSL) called Sway. Sway is based on Rust and includes syntax to leverage a blockchain VM without needlessly verbose boilerplate. Sway was created alongside the FuelVM and designed for the high-compute Fuel environment.
Sway prioritizes compile-time analysis and safety, similar to Rust’s borrow checker and safety-first semantics. Additionally, it has the syntax of Rust. From Solidity, Sway took the notion of a smart-contract-paradigm language with built-in top-level contract storage and blockchain mechanisms for ergonomic and safe contract programming.
Sway brings the notion of static auditing to smart contracts. In addition, Sway is highly performant and has extensible optimization passes and a modular backend for targeting different blockchain architectures.
Part of what makes Sway so powerful is the fantastic suite of developer tools surrounding it. The Fuel development environment retains the benefits of smart contract languages like Solidity, while adopting the paradigms introduced in the Rust tooling ecosystem.
Now, developers can have a completely vertically integrated experience where every component, from the virtual machine to the CLI, works in harmony.
Fuel is currently live on testnet only.
The latest testnet network is the