Hi, thank you for helping me figure this out. I have tried to look on the wiki for the appropriate tag for referencing a key on a source dataset and came across https://taginfo.openstreetmap.org/keys/source%3Aprow_ref, https://taginfo.openstreetmap.org/keys/source%3Ahighway_authority_ref,https://taginfo.openstreetmap.org/keys/source%3Areg_ref, https://taginfo.openstreetmap.org/keys/source%3Aunsigned_ref, etc which seems to differentiate between a broader uniqueness requirement and something narrowly scoped to the source material. I was worried source:ref=• should have a value that links to the source data and not specify the unique id of the node in the source.

Is here the best place to discuss this or should I bring it up in the osm tagging slack channel?