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

## Logical Model: CWTPayload - Detailed Descriptions

Active as of 2026-04-27

Definitions for the CWTPayload logical model.

- Key Elements Table
- Differential Elements Table
- Snapshot Elements Table

Guidance on how to interpret the contents of this table can be foundhere

0. CWTPayload
Definition | Logical Model for CBOR Web Token (CWT) Payload Logical Modelin CWT Payload https://www.iana.org/assignments/cwt/cwt.xhtml Base definition for all types defined in FHIR type system.
Short | CBOR Web Token (CWT) Payload (Common)Base for all types and resources
Control | 0..*
Is Modifier | false
Logical Model | Instances of this logical model are not marked to be the target of a Reference
2. CWTPayload.1
Definition | Issuer
Short | Issuer Code (iss)
Control | 0..1
Type | Coding
4. CWTPayload.4
Definition | Expiration Time
Short | Expiration Date Time(exp)
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
6. CWTPayload.6
Definition | Issued At
Short | Issued At (iat)
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
8. CWTPayload.-260
Definition | HCert
Short | Health Certificate
Control | 0..1
Type | http://smart.who.int/trust/StructureDefinition/HCert

Guidance on how to interpret the contents of this table can be foundhere

0. CWTPayload
Definition | Logical Model for CBOR Web Token (CWT) Payload Logical Modelin CWT Payload https://www.iana.org/assignments/cwt/cwt.xhtml
Short | CBOR Web Token (CWT) Payload (Common)
Logical Model | Instances of this logical model are not marked to be the target of a Reference
2. CWTPayload.1
Definition | Issuer
Short | Issuer Code (iss)
Control | 0..1
Type | Coding
4. CWTPayload.4
Definition | Expiration Time
Short | Expiration Date Time(exp)
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
6. CWTPayload.6
Definition | Issued At
Short | Issued At (iat)
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
8. CWTPayload.-260
Definition | HCert
Short | Health Certificate
Control | 0..1
Type | http://smart.who.int/trust/StructureDefinition/HCert

Guidance on how to interpret the contents of this table can be foundhere

0. CWTPayload
Definition | Logical Model for CBOR Web Token (CWT) Payload Logical Modelin CWT Payload https://www.iana.org/assignments/cwt/cwt.xhtml
Short | CBOR Web Token (CWT) Payload (Common)
Control | 0..*
Is Modifier | false
Logical Model | Instances of this logical model are not marked to be the target of a Reference
2. CWTPayload.1
Definition | Issuer
Short | Issuer Code (iss)
Control | 0..1
Type | Coding
4. CWTPayload.4
Definition | Expiration Time
Short | Expiration Date Time(exp)
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
6. CWTPayload.6
Definition | Issued At
Short | Issued At (iat)
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
8. CWTPayload.-260
Definition | HCert
Short | Health Certificate
Control | 0..1
Type | http://smart.who.int/trust/StructureDefinition/HCert