604512 detected identities — — currently have a directly traceable documentary source.
A recorded documentary link does not imply a successful HTTP check. Metadata observation dates are distinct from link verification dates.
— technical identities reconciled into — documentary groups; aliases and provenance are preserved.
— private groups are absent from the registry because of incomplete metadata. Publications without titles or links remain searchable and are explicitly flagged.
Distinct versions or editions may have similar metadata. Different documentary identifiers remain separate when a shared identity has not been established.