# Keep Evidence identifiers independent from kind

An Evidence Unit keeps the same identifier when its kind is corrected or its Source
Evidence is unambiguously renamed; kind remains a separate validated field. This avoids
breaking citations and evaluation fixtures for a classification change, while genuine
semantic splits receive new identifiers so independent units never share an identity.
Identifiers use `evidence:<slug>`, are assigned once, persisted in the manifest and are
never recomputed automatically from mutable titles, paths or content hashes.