> For the complete documentation index, see [llms.txt](https://docs.guardianservice.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.guardianservice.app/technical-information/users/standard-registry-users-schemas-and-policies/policies/trustchain-apis.md).

# Trustchain APIs

- [Requesting](https://docs.guardianservice.app/technical-information/users/standard-registry-users-schemas-and-policies/policies/trustchain-apis/requesting.md)
- [Building and returning](https://docs.guardianservice.app/technical-information/users/standard-registry-users-schemas-and-policies/policies/trustchain-apis/building-and-returning.md)