Granted: All of these examples could also somehow be realized with a PKI. However, the SSI framework thinks in terms of identity and credential standards. Ultimately, it still relies on a trust cascade, but it becomes more adaptive and distributed. In this sense, it functions as a generalization of a PKI, basically a “system of systems”. Every permission can be atomically adjusted for each device; interoperability can be ensured by verifiable credentials: if VirGo admits only those devices to the network that can handle network-specific security requests (in the form of verifiable credentials), VirGo knows that the devices have been configured to work with this network. If trust level changes for certain applications, or security issues are detected in certain ecosystem, VirGo can simply invalidate the credentials pertaining to the issue, without much overhead. Thanks to its peer-to-peer nature and the ease of granular access management, SSI scores higher on confidentiality and scalability compared to a PKI.