# CESS Proofs API > Forked from [**Filecoin rust-filecoin-proofs-api**](https://github.com/filecoin-project/rust-filecoin-proofs-api) This library is meant to be the official public API into the proofs library. [![CircleCI](https://circleci.com/gh/CESSProject/cess-proving-system-api/tree/master.svg?style=svg)](https://circleci.com/gh/CESSProject/cess-proving-system-api/tree/master) > The main API to interact with the proofs system in [CESS](https://cess.one). ## Default build options The build options enabled by default are `pairing` and `gpu`. An alternative backend that can be used is `blst`. The `pairing` and `blst` options specify which bls12-381 pairing library to use.. ## Running the tests Running the tests with the default features can be done like this: ``` cargo test --release --all ``` Running with the `blst` and `gpu` features can be done like this: ``` cargo test --no-default-features --features blst,gpu --release --all ``` Running with `pairing` and without the `gpu` feature can be done like this: ``` cargo test --no-default-features --features pairing --release --all ``` ## License MIT or Apache 2.0