Placements developer guide
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    CertificateContent: Struct<
        {
            assistantName: String;
            departmentId: brand<String, "DepartmentId">;
            departmentName: String;
            personId: brand<String, "PersonId">;
            semesters: $Array<
                Struct<
                    {
                        days: Int;
                        endsOn: String;
                        schools: $Array<String>;
                        semesterId: brand<String, "SemesterId">;
                        startsOn: String;
                    },
                >,
            >;
        },
    > = ...

    What a certificate states. Its digest is the content hash that every issue records.