Issue a W3C Verifiable Credential for a learning achievement using the VC Data Model 2.0 with an education-specific achievement type

Steps

1. Reference W3C VC Data Model 2.0 (now a W3C Recommendation as of 2025) at https://www.w3.org/TR/vc-data-model-2.0/ for required fields: @context, type, issuer, validFrom, credentialSubject
2. Include the Open Badges 3.0 context https://purl.imsglobal.org/spec/ob/v3p0/context-3.0.3.json alongside the W3C VC context https://www.w3.org/ns/credentials/v2 in the @context array for education-specific achievement typing
3. Set credentialSubject.achievement.type to ["Achievement"] and populate achievement.name, achievement.description, achievement.criteria.narrative, and optionally achievement.image with a badge image URL
4. Sign using a Data Integrity Proof: generate an eddsa-rdfc-2022 proof with proofPurpose=assertionMethod, verificationMethod pointing to the issuer's DID document key, and created timestamp
5. Publish the credential as a JSON-LD document; optionally wrap in a Verifiable Presentation (VP) for transmission to a verifier using the presentationSubmission format per the Presentation Exchange specification
6. Verify the credential by resolving the issuer DID, fetching the verification method public key, and confirming the proof's cryptographic signature matches the canonicalized document