Corrections and retractions
A signature proves the payload is the one we published. It does not prove the number is right.
A correction replaces the figure in the catalog and signs the new payload. The previous signature no longer matches. Check the current record at /verify. Cite the trail URL, the fact anchor, and the verified date on the figure you used.
Geometry is OpenStreetMap under ODbL. The line offered on each trail page, and as GeoJSON, is the derivative. Editorial text is not covered by that licence.
There is no second changelog beside the signed record. A per-trail history that is not the signed payload is not published here.