# Fuel Specification Implementation
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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.