> For the complete documentation index, see [llms.txt](https://docs.stamp.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.stamp.network/devs/tutorials/verify-credentials.md).

# Verify Credentials

This tutorial will teach you how to verify a user's credentials. This can be used as a login system, gating mechanism, or one-time redemption. \
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Stamp Passports are PODs (Provable Object Data) that can be verified while maintaining different levels of an account's privacy. 

### Privacy

When you verify a passport, you must define which fields the user must disclose. Each proof from a POD comes with a nullifier parameter, which is unique and can be used to do single-use verification while maintaining the user's privacy. 

### Verification Code

Coming soon...