Public shared-view endpoints expose values from columns that the view owner had hidden through three independent paths. First, the `groupBy` function returns raw values for any column named in the request. Second, filter and sort arrays operate on hidden columns, enabling boolean-blind extraction (a technique used to infer data by observing the application's response to true or false queries). Third, the related-data list accepts arbitrary link-column IDs from other tables within the same base. This allows anyone with a shared-view UUID to enumerate hidden-column values, confirm hidden-column values by observing row counts, or read records from unrelated tables in the same base without authentication.