Academic credentials

Diplomas, transcripts, and professional certifications are increasingly issued as verifiable digital credentials (W3C VC, Open Badges, Blockcerts). The signing authority — a university, a certification body, a professional society — issues credentials that relying parties (employers, other institutions, government agencies) verify. The signing key is a high-value target: a compromised key lets an attacker issue fake credentials en masse.

Confium splits the issuing authority across multiple stakeholders (registrar + department + academic senate, or certification body + exam authority + oversight committee). No single party can issue credentials alone.

When to choose this use case

  • You issue verifiable credentials (diplomas, transcripts, certifications, badges) and the issuing authority is too sensitive for any single administrator.
  • You need cross-institutional credential verification (academic mobility, professional licensing).
  • You want a public, auditable record of every credential ever issued by your institution.
  • You’re deploying a sovereign digital credential framework.

How Confium solves it

A Mode 3 (Sovereign PKI) deployment with:

  • Custom credential profile matching W3C Verifiable Credentials (JSON-LD) or Open Badges (JSON).
  • Attribute-based quorum: “2-of-3 registrar + 1-of-1 department head + 1-of-1 academic senate oversight”.
  • Transparency log recording every credential issuance. Anyone can audit; the institution cannot silently issue or revoke.
  • Long-term archival: diplomas must remain verifiable for the holder’s lifetime (50–80 years typical).

Verifiable Credentials integration

W3C Verifiable Credentials use a proof field for the issuer’s signature. Confium produces a standard Ed25519Signature2018 / JsonWebSignature2020 proof that any conformant VC verifier accepts:

{
  "@context": [
    "https://www.w3.org/2018/credentials/v1",
    "https://www.example.edu/credentials/v1"
  ],
  "id": "https://example.edu/credentials/3732",
  "type": ["VerifiableCredential", "UniversityDegreeCredential"],
  "issuer": "did:web:example.edu",
  "issuanceDate": "2026-07-28T14:23:42Z",
  "credentialSubject": {
    "id": "did:example:ebfeb1f712ebc6f1c276e12ec21",
    "degree": {
      "type": "BachelorDegree",
      "name": "Bachelor of Science in Computer Science"
    }
  },
  "proof": {
    "type": "Ed25519Signature2018",
    "created": "2026-07-28T14:23:42Z",
    "verificationMethod": "did:web:example.edu#confium-key-1",
    "proofValue": "..."
  }
}

The proofValue is produced by a Confium threshold signing session; the verifier sees only a standard signature.

Multi-stakeholder issuance

Real credential issuance requires multiple approvals:

  • Registrar verifies the student completed requirements.
  • Department head confirms the degree classification.
  • Academic senate (or equivalent) attests to the institutional authority.
[quorum]
threshold = 3
total = 4

[[signers]]
id = "registrar"
attributes = { role = "registrar", department = "..." }

[[signers]]
id = "department-head"
attributes = { role = "faculty", department = "..." }

[[signers]]
id = "academic-senate"
attributes = { role = "governance" }

[[signers]]
id = "oversight"
attributes = { role = "audit" }

Revocation

Credentials can be revoked (academic misconduct discovered post- issuance, degree rescinded). Confium’s transparency log records revocation events alongside issuance events. Relying parties check both:

# Verify a credential is issued AND not revoked.
proof = Confium::PKI::VerifiableCredential.from_json(credential_json)

issuer_root = Confium::Transparency.current_root
inclusion = Confium::Transparency.verify_inclusion(
  entry: proof.entry,
  proof: proof.inclusion_proof,
  root: issuer_root,
)

revocation_check = Confium::Transparency.check_revocation(
  credential_id: proof.id,
)

puts "Valid" if inclusion.valid? && !revocation_check.revoked?

Cross-institutional mobility

A diploma issued by University A should be verifiable by Employer B and University C without contacting University A. Confium’s transparency log provides this: B and C query the public log (or a cached copy) and verify the inclusion proof.

Multiple institutions can share a transparency log (consortium model) or run independent logs (federated model). The framework supports both.

Lifelong verifiability

Academic credentials must remain verifiable for the holder’s lifetime. This is a 50–80 year horizon — far longer than any specific cryptographic algorithm’s projected lifetime. Confium addresses this with:

  • RFC 4998 ERS archival: re-timestamps evidence as algorithms evolve.
  • Composite signatures with PQ component: ensures the credential still verifies after quantum computers arrive.
  • Transparency log anchoring in Bitcoin via OTS: irrefutable time proof that survives institutional collapse.

See also