WHO SMART Trust
1.1.6 - CI Build

WHO SMART Trust, published by WHO. This guide is not an authorized publication; it is the continuous build for version 1.1.6 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/WorldHealthOrganization/smart-trust/tree/tng-additional-context-jsonld and changes regularly. See the Directory of published versions

## ValueSet: WHO GDHCN Key Usage ValueSet (Experimental)

Official URL: http://smart.who.int/trust/ValueSet/KeyUsage | Version: 1.1.6
Active as of 2026-01-22 | Computable Name: KeyUsage

ValueSet of codes for key usage codes for Production environment

References

This value set is not used here; it may be used elsewhere (e.g. specifications and/or implementations that use this content)

### Logical Definition (CLD)

- Include these codes as defined in `http://smart.who.int/trust/CodeSystem/KeyUsage` version 📦1.1.6

  Code | Display | Definition
  SCA | Signing Certificate Authority | A certificate which acts a trust anchor in the verification of the certificate chain for the DSCs issued by a Trust Network participant
  DSC | Document Signing Certificate | A certificate which may be used to verify a digital signature within a Verfifiable Digital Health Certificate
  UP | Upload | Used to verify digital signature of cryptographically signed content uploaded to services within the Global Digital Health Certification Network, in particular the Trust Network Gateway
  TLS | TLS | Used for establishing (m)TLS connections with systems, in particular between the Trust Network Gateway and backend systems of a Trust Network Participant

### Expansion

Expansion performed internally based on codesystem WHO GDHCN Key Usage CodeSystem v1.1.6 (CodeSystem)

This value set contains 4 concepts

System | Code | Display (en) | Definition | JSON | XML
`http://smart.who.int/trust/CodeSystem/KeyUsage` | SCA | Signing Certificate Authority | A certificate which acts a trust anchor in the verification of the certificate chain for the DSCs issued by a Trust Network participant |  |
`http://smart.who.int/trust/CodeSystem/KeyUsage` | DSC | Document Signing Certificate | A certificate which may be used to verify a digital signature within a Verfifiable Digital Health Certificate |  |
`http://smart.who.int/trust/CodeSystem/KeyUsage` | UP | Upload | Used to verify digital signature of cryptographically signed content uploaded to services within the Global Digital Health Certification Network, in particular the Trust Network Gateway |  |
`http://smart.who.int/trust/CodeSystem/KeyUsage` | TLS | TLS | Used for establishing (m)TLS connections with systems, in particular between the Trust Network Gateway and backend systems of a Trust Network Participant |  |

Explanation of the columns that may appear on this page:

Level | A few code lists that FHIR defines are hierarchical - each code is assigned a level. In this scheme, some codes are under other codes, and imply that the code they are under also applies
System | The source of the definition of the code (when the value set draws in codes defined elsewhere)
Code | The code (used as the code in the resource instance)
Display | The display (used in the display element of a Coding). If there is no display, implementers should not simply display the code, but map the concept into their application
Definition | An explanation of the meaning of the concept
Comments | Additional notes about how to use the code