Credentials
related_credentials
A LearnCoin extension field for linking credentials — reissue chains, team-challenge cross-references, replacement relationships.
credentialSubject.achievement.related_credentials is a LearnCoin-extension field for expressing relationships between credentials. Each entry has a credential_id and a relationship enum — REISSUED_FROM, REPLACES, TEAM_MEMBER_OF, PRECEDED_BY, etc.
The two biggest use cases: reissue chains (a credential had a typo; the corrected version is REISSUED_FROM the original) and team challenges (an OB 3.0-conformant credential has exactly one recipient, so team challenges issue N separate credentials cross-referenced via TEAM_MEMBER_OF links).
The field is carried in the LearnCoin extension JSON-LD context (schema.learncoin.me/v1/context.json) — pending publication — so it's not yet cryptographically committed in the signed JSONLD. Today it lives in display_metadata and renders on the verification page as a "related credentials" section.
This is intentionally narrower than general credential-graph features some SSI platforms support. We resisted building a generic credential-linking API because most use cases don't need it; the ones that do (reissues, teams) are well-served by the closed enum.
Related terms