Issue an Open Badges 3.0 Verifiable Credential badge and verify its cryptographic proof

Steps

1. Obtain the Open Badges 3.0 specification from 1EdTech and confirm the AchievementCredential JSON-LD context and required claims (type, issuer, credentialSubject, achievement)
2. Generate or retrieve the issuer's signing key pair; construct the AchievementCredential JSON-LD document and sign it using a supported proof method (e.g., Ed25519Signature2020 or DataIntegrityProof) to produce the VC
3. Publish the issuer's DID document or JSON-LD key material at a resolvable URL so verifiers can retrieve the public key for proof verification
4. Deliver the signed VC to the earner via the OB 3.0 API endpoint or as a direct download; the earner stores it in a compliant wallet
5. Verify the credential by resolving the issuer key, checking the cryptographic proof, confirming the credentialStatus (BitstringStatusListEntry) is not set to revoked, and validating required claims against the AchievementCredential schema