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• OPC-10000-21 – OPC Unified Architecture - Part 21: Device Onboarding
  7.1 Overview
  the Device possesses the PrivateKey associated with the Certificate. The DCA uses the SecureChannel to request a new Application Instance Certificate which will allow the DCA to provision the other ... the Device , the Registrar validates the Ticket (see 6.4 ). Once the Registrar has found a valid Ticket that matches a DeviceIdentity Certificate , it can use the CertificateAuthority in the Ticket