Union of http://smart.who.int/trust/CodeSystem/KeyUsage-UAT and http://smart.who.int/trust/CodeSystem/KeyUsage-UAT

This is the CodeSystem that contains all the codes in WHO GDHCN Key Usage CodeSystem - UAT (http://smart.who.int/trust/CodeSystem/KeyUsage-UAT) and WHO GDHCN Key Usage CodeSystem - UAT (http://smart.who.int/trust/CodeSystem/KeyUsage-UAT). E.g. what you have to deal with if you get resources containing codes in either of them

CodeSystem

Generated Narrative: CodeSystem 9aac699c-8b4e-42f3-8666-31a00a2b315f-20

This code system http://hl7.org/fhir/comparison/CodeSystem/9aac699c-8b4e-42f3-8666-31a00a2b315f-20 defines codes, but no codes are represented here

CodeDisplayDefinition
SCA Signer Certificate Authority (SCA)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 (DSC)A certificate which may be used to verify a digital signature within a Verfifiable Digital Health Certificate
DECA Data Exchange Certificate Authority (DECA)A certificate which acts a trust anchor in the verification of the certificate chain for the DESCs issued by a Trust Network Participant
DESC Data Exchange Signing Certificate (DESC)A certificate which may be used to initiate a secure data exchange connection (e.g. mTLS) between Trust Network Participants
TLS Transport Layer Security (TLS)Used for establishing (m)TLS connections with systems, in particular between the Trust Network Gateway and backend systems of a Trust Network Participant
UP Upload (UP)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