If I want to link to a community X on a Lemmy instance Y.zzz, I know I should use the link /c/X.zzz, which will redirect to the copy of the instance on the server where the user has the account.
What is the analogous way to link to a post? For example this post has address lemmy.ca/post/1866360 but what link should I give to users on another instance, so that they can see the post in their instance?
Use the post checksum as key info and refer to it at each site by a lookup.
Sadly that means some coding AND database mods.