Traditional certificates fail because they are unfalsifiable assertions on a PDF. A bootcamp completion badge tells a hiring manager that someone paid tuition and watched the videos. It does not tell them whether the candidate can ship a retrieval pipeline that survives an adversarial eval. The market knows this, which is why most certificates trade at zero in the actual hiring loop.
Verifiable credentials change the contract. Each claim on the credential is bound to an artifact — a graded Job Twin submission, a mentor-calibrated rubric score, a signed VC payload — and any third party can check the cryptographic proof without contacting us. The credential keeps verifying even if the platform shuts down, because the public keys live at a stable JWKS endpoint and the proof is self-contained.
The full chain is mechanical: entrance assessment gates into enrollment; enrollment opens Job Twin simulations; submissions go through mentor calibration with a kappa floor; passing work mints a W3C VC in Open Badges 3.0 form; opt-in talents surface in the public skills directory; an employer hire generates an Ed25519 hire attestation; ninety days later the employer signs a 90-day outcome attestation that closes the loop and triggers the credit clause. Every link in that chain is a signed object on the ledger.