WHO SMART Trust
1.4.0 - release

WHO SMART Trust, published by WHO. This guide is not an authorized publication; it is the continuous build for version 1.4.0 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/v1.4.0-release-candidate and changes regularly. See the Directory of published versions

## : WHO GDHCN Key Usage CodeSystem - UAT - XML Representation

Active as of 2026-01-12

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    <CodeSystem xmlns="http://hl7.org/fhir">
      <id value="KeyUsage-UAT"/>
      <text>
        <status value="generated"/>
        <div xmlns="http://www.w3.org/1999/xhtml"><p class="res-header-id"><b>Generated Narrative: CodeSystem KeyUsage-UAT</b></p><a name="KeyUsage-UAT"> </a><a name="hcKeyUsage-UAT"> </a><p>This case-insensitive code system <code>http://smart.who.int/trust/CodeSystem/KeyUsage-UAT</code> defines the following codes:</p><table class="codes"><tr><td style="white-space:nowrap"><b>Code</b></td><td><b>Display</b></td><td><b>Definition</b></td></tr><tr><td style="white-space:nowrap">SCA<a name="KeyUsage-UAT-SCA"> </a></td><td>Signer Certificate Authority (SCA)</td><td>A certificate which acts a trust anchor in the verification of the certificate chain for the DSCs issued by a Trust Network participant</td></tr><tr><td style="white-space:nowrap">DSC<a name="KeyUsage-UAT-DSC"> </a></td><td>Document Signing Certificate (DSC)</td><td>A certificate which may be used to verify a digital signature within a Verfifiable Digital Health Certificate</td></tr><tr><td style="white-space:nowrap">DECA<a name="KeyUsage-UAT-DECA"> </a></td><td>Data Exchange Certificate Authority (DECA)</td><td>A certificate which acts a trust anchor in the verification of the certificate chain for the DESCs issued by a Trust Network Participant</td></tr><tr><td style="white-space:nowrap">DESC<a name="KeyUsage-UAT-DESC"> </a></td><td>Data Exchange Signing Certificate (DESC)</td><td>A certificate which may be used to initiate a secure data exchange connection (e.g. mTLS) between Trust Network Participants</td></tr><tr><td style="white-space:nowrap">TLS<a name="KeyUsage-UAT-TLS"> </a></td><td>Transport Layer Security (TLS)</td><td>Used for establishing (m)TLS connections with systems, in particular between the Trust Network Gateway and backend systems of a Trust Network Participant</td></tr><tr><td style="white-space:nowrap">UP<a name="KeyUsage-UAT-UP"> </a></td><td>Upload (UP)</td><td>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</td></tr></table></div>
      </text>
      <url value="http://smart.who.int/trust/CodeSystem/KeyUsage-UAT"/>
      <version value="1.4.0"/>
      <name value="KeyUsage-UAT"/>
      <title value="WHO GDHCN Key Usage CodeSystem - UAT"/>
      <status value="active"/>
      <experimental value="true"/>
      <date value="2026-01-12T11:38:35+00:00"/>
      <publisher value="WHO"/>
      <contact>
        <name value="WHO"/>
        <telecom>
          <system value="url"/>
          <value value="http://who.int"/>
        </telecom>
      </contact>
      <description
                   value="CodeSystem for GDHCN Key Usage that has usage codes for verification keys published to the Trust Network as defined by the [certificate governance](concepts_certificate_governance.html) for User Acceptance Testing environment"/>
      <jurisdiction>
        <coding>
          <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/>
          <code value="001"/>
        </coding>
      </jurisdiction>
      <caseSensitive value="false"/>
      <content value="complete"/>
      <count value="6"/>
      <concept>
        <code value="SCA"/>
        <display value="Signer Certificate Authority (SCA)"/>
        <definition
                    value="A certificate which acts a trust anchor in the verification of the certificate chain for the DSCs issued by a Trust Network participant"/>
      </concept>
      <concept>
        <code value="DSC"/>
        <display value="Document Signing Certificate (DSC)"/>
        <definition
                    value="A certificate which may be used to verify a digital signature within a Verfifiable Digital Health Certificate"/>
      </concept>
      <concept>
        <code value="DECA"/>
        <display value="Data Exchange Certificate Authority (DECA)"/>
        <definition
                    value="A certificate which acts a trust anchor in the verification of the certificate chain for the DESCs issued by a Trust Network Participant"/>
      </concept>
      <concept>
        <code value="DESC"/>
        <display value="Data Exchange Signing Certificate (DESC)"/>
        <definition
                    value="A certificate which may be used to initiate a secure data exchange connection (e.g. mTLS) between Trust Network Participants"/>
      </concept>
      <concept>
        <code value="TLS"/>
        <display value="Transport Layer Security (TLS)"/>
        <definition
                    value="Used for establishing (m)TLS connections with systems, in particular between the Trust Network Gateway and backend systems of a Trust Network Participant"/>
      </concept>
      <concept>
        <code value="UP"/>
        <display value="Upload (UP)"/>
        <definition
                    value="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"/>
      </concept>
    </CodeSystem>