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DID and Verkey: DIDs work as the role of trust anchor to the ledger, as we create Steward’s DID. The actions (including owner’s action and manufacturer's action) is written on the ledger, generate new DID/Verkey pairs. After that, Prover uses Credential Offer to create Credential Request. Trust Anchor then uses Prover's Credential Request to issue a Credential. Steward is then responsible of creating other actors like manufacturer (production line), QA team, distributor (mobile operator) and end customer at various stages. For all the actors, the Steward will onboarding actors mentioned above and then grant verinym and a trust anchor role.
Implementation
https://github.com/quantumcatwang/Telecom-IoT-device-SSI