# Page Not Found

The URL `understanding-humanity-protocol/key-concepts` does not exist.

You might be looking for one of these pages:
- [The Problem We Solve](https://docs.humanity.org/understanding-humanity/the-problem-we-solve.md)
- [Overall System Architecture](https://docs.humanity.org/understanding-humanity/overall-system-architecture.md)
- [What Is Humanity](https://docs.humanity.org/understanding-humanity/what-is-humanity.md)
- [Core Concepts: Verifiable Credentials & SSI](https://docs.humanity.org/understanding-humanity/core-concepts-verifiable-credentials-and-ssi.md)
- [How Biometric Proof-of-Humanity Works](https://docs.humanity.org/understanding-humanity/how-biometric-proof-of-humanity-works.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://docs.humanity.org/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://docs.humanity.org/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/understanding-humanity/the-problem-we-solve.md`)
- Use `Accept: text/markdown` header for content negotiation