WHO SMART Trust
1.5.0 - release

WHO SMART Trust, published by WHO. This guide is not an authorized publication; it is the continuous build for version 1.5.0 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/v1.5.0-release-candidate and changes regularly. See the Directory of published versions

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

Active as of 2026-04-27

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    {
      "resourceType" : "CodeSystem",
      "id" : "KeyUsage-UAT",
      "text" : {
        "status" : "generated",
        "div" : "<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>"
      },
      "url" : "http://smart.who.int/trust/CodeSystem/KeyUsage-UAT",
      "version" : "1.5.0",
      "name" : "KeyUsage-UAT",
      "title" : "WHO GDHCN Key Usage CodeSystem - UAT",
      "status" : "active",
      "experimental" : true,
      "date" : "2026-04-27T07:07:17+00:00",
      "publisher" : "WHO",
      "contact" : [
        {
          "name" : "WHO",
          "telecom" : [
            {
              "system" : "url",
              "value" : "http://who.int"
            }
          ]
        }
      ],
      "description" : "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" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
              "code" : "001"
            }
          ]
        }
      ],
      "caseSensitive" : false,
      "content" : "complete",
      "count" : 6,
      "concept" : [
        {
          "code" : "SCA",
          "display" : "Signer Certificate Authority (SCA)",
          "definition" : "A certificate which acts a trust anchor in the verification of the certificate chain for the DSCs issued by a Trust Network participant"
        },
        {
          "code" : "DSC",
          "display" : "Document Signing Certificate (DSC)",
          "definition" : "A certificate which may be used to verify a digital signature within a Verfifiable Digital Health Certificate"
        },
        {
          "code" : "DECA",
          "display" : "Data Exchange Certificate Authority (DECA)",
          "definition" : "A certificate which acts a trust anchor in the verification of the certificate chain for the DESCs issued by a Trust Network Participant"
        },
        {
          "code" : "DESC",
          "display" : "Data Exchange Signing Certificate (DESC)",
          "definition" : "A certificate which may be used to initiate a secure data exchange connection (e.g. mTLS) between Trust Network Participants"
        },
        {
          "code" : "TLS",
          "display" : "Transport Layer Security (TLS)",
          "definition" : "Used for establishing (m)TLS connections with systems, in particular between the Trust Network Gateway and backend systems of a Trust Network Participant"
        },
        {
          "code" : "UP",
          "display" : "Upload (UP)",
          "definition" : "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"
        }
      ]
    }