Participant entities being integrated to Evidence need to be registered via a Registrar Module as outlined in Evidence Registrar Module. The out of the box participant evidence types has been configured in CoreRegistrarModule. This binds the evidence type to it's entity. These map bindings are loaded at runtime and are used by the Evidence Controller when looking up the appropriate evidence entity for a given type, i.e. the entity that has implemented the ParticipantEvidenceInterface.