Comment on Why Book Corners won't sync contributions back to OpenStreetMapparentComments−Ajedi321moYou could store the ID in a tag. They already do this for e.g. wikidata[1] and gnis[2].Though I kinda doubt they want to support maintaining these for every single project that wants one.[1]: https://wiki.openstreetmap.org/wiki/Key:wikidata[2]: https://wiki.openstreetmap.org/wiki/Key:gnis:feature_id
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You could store the ID in a tag. They already do this for e.g. wikidata[1] and gnis[2].
Though I kinda doubt they want to support maintaining these for every single project that wants one.
[1]: https://wiki.openstreetmap.org/wiki/Key:wikidata
[2]: https://wiki.openstreetmap.org/wiki/Key:gnis:feature_id