Here's a typical URI:
https://opencontext.org/media/48fb6172-647a-40f6-a576-e50d006a4f52
I also have an ARK id for it:
https://n2t.net/ark:/28722/k2q244j7j
The JSON-LD representation (https://opencontext.org/media/48fb6172-647a-40f6-a576-e50d006a4f52.json) says "owl:sameAs" for the ARK id.
I just want to maximize the probability that someone can look up the citation to an OC record over the years.