10.3 SSI & Decentralised IDM: SSI Use Cases

Question 1

Lifecycle of a Diploma VC
1. Holder requests diploma from the issuer.
2. Issuer issues the diploma, and (optionally) …

3. Holder receives it and saves it to his mobile wallet.
   § Note: Credential storage is still uncertain. For privacy, a holder ideally only stores it on their device. Realistically, cloud wallet providers will be the popular choice.
   § Also note: A credential‘s holder is not necessarily also its subject (e.g., parent holding education credentials for child).
4. Holder presents VC (or VP) to the verifier.
   § Note: A verifier never …
5. Verifier checks signature(s) and also checks
   verifiable data registry for … and … of the diploma, if required.

Answer 1

adds a proof of issuance of the diploma to the verifiable data registry.

directly receives VC from the Issuer.

revocation status; proof of issuance

Question 2

VC structure
Verifiable Credentials take the form of a JSON (or JSON-LD) document and typically contain:
§ Context
§ …
§ Issuance timestamp
§ … (optional)
§ Type
§ Subject
§ …
§ Cryptographic proof to ensure the …

Answer 2

Issuer

Expiry timestamp

Subject identity attributes

integrity and authenticity of the VC

Question 3

Selective disclosure:
§ Selective disclosure is a core concept of SSI and it enables individuals to … than is strictly necessary for a given service.
§ Issuers can issue VCs that …
§ If a VC supports selective disclosure, holders can create a VP containing …

Answer 3

share no more of their private data

support selective disclosure.

only parts of the VC.