# Fuel Specification Implementation
[](https://github.com/FuelLabs/fuel-vm/actions/workflows/ci.yml)
[](https://crates.io/crates/fuel-tx)
[](https://docs.rs/fuel-tx/)
[](https://discord.gg/xfpK4Pe)
This crate contains a definition of types from the [specification](https://github.com/FuelLabs/fuel-specs/blob/master/src/tx-format/index.md),
with canonical serialization and deserialization. The `Transaction` and `Checked<Tx>` type
implements fee calculation and [validation of rules](https://github.com/FuelLabs/fuel-specs/blob/master/src/protocol/tx-validity.md) defined by the specification.