Check our sources.

How we keep track

Links can change. We check for that.

An automated check looks for unavailable or changed sources. When a change is detected, an editor can review whether a story needs an update or correction.

For some sources, Lens recorded a digital fingerprint of the version it fetched. This is a way to detect a change; it is not a saved copy of the document. The list below shows where a fingerprint is available.