> For the complete documentation index, see [llms.txt](https://unirep.gitbook.io/unirep/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://unirep.gitbook.io/unirep/protocol/glossary/users-and-attesters.md).

# Users and Attesters

## Actors in Unirep

### User 👤

There are users who **receive reputation** and **prove received reputation**.

* Users sign up by calling <mark style="color:blue;">`userSignUp`</mark> in Unirep contract
* User's <mark style="color:green;">`identityCommitment`</mark> is revealed at this time and it will be recorded in the contract to prevent double signup.
* The identity commitment will not reveal the actual <mark style="color:red;">`identity`</mark> of the user but at the same time allow user to prove identity in the circuit.

### Attester 👑

There are attesters who **give attestations** to users and the attestations become the users' reputation.

* Attesters sign up by calling <mark style="color:blue;">`attesterSignUp`</mark> in Unirep contract.
* Attesters would be given `attesterId` by the order they sign up, `attesterId` begins with `1`.
* Attester information and attestation history are *public* and so everyone can see which attester submits which attestation to the Unirep contract.