> For the complete documentation index, see [llms.txt](https://ssi-did-directory.gitbook.io/open-directory-for-all/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ssi-did-directory.gitbook.io/open-directory-for-all/fundamentals.md).

# Fundamentals

- [DIDs in a nutshell](https://ssi-did-directory.gitbook.io/open-directory-for-all/fundamentals/did-in-a-nutshell.md)
- [SSI in a nutshell](https://ssi-did-directory.gitbook.io/open-directory-for-all/fundamentals/ssi-in-a-nutshell.md)
- [Contribution Pattern](https://ssi-did-directory.gitbook.io/open-directory-for-all/fundamentals/contribution-pattern.md)
- [Sources and Working Groups](https://ssi-did-directory.gitbook.io/open-directory-for-all/fundamentals/sources-and-working-groups.md)
- [SCIENTIFIC FOUNDATION](https://ssi-did-directory.gitbook.io/open-directory-for-all/fundamentals/scientific-foundation.md)
- [Origins](https://ssi-did-directory.gitbook.io/open-directory-for-all/fundamentals/scientific-foundation/origins.md)
- [Self-Sovereign Identity (SSI)](https://ssi-did-directory.gitbook.io/open-directory-for-all/fundamentals/scientific-foundation/task-lists.md)
- [Decentralized Identifiers (DID)](https://ssi-did-directory.gitbook.io/open-directory-for-all/fundamentals/scientific-foundation/tasks.md): https://www.w3.org/TR/did-core/
- [Verifiable Credentials (VC)](https://ssi-did-directory.gitbook.io/open-directory-for-all/fundamentals/scientific-foundation/verifiable-credentials-vc.md)
- [Governance Framework](https://ssi-did-directory.gitbook.io/open-directory-for-all/fundamentals/scientific-foundation/governance-framework.md)
- [Trust Registry](https://ssi-did-directory.gitbook.io/open-directory-for-all/fundamentals/scientific-foundation/trust-registry.md)
- [Common Goals](https://ssi-did-directory.gitbook.io/open-directory-for-all/fundamentals/scientific-foundation/common-goals.md)
- [Constraints](https://ssi-did-directory.gitbook.io/open-directory-for-all/fundamentals/scientific-foundation/constraints.md)