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ISSNs identify the publisher (edit: the publication). DOIs identify items of content.

The publication, not the publisher.

Ah yes, that's true.

DOIs are assigned to journals too. It's not entirely consistent though, and journal DOIs can overlap with ISSNs.

If you know of a way to automate minting a DOI on WordPress - please let me know. I'd be keen to experiment.

Possibly https://wordpress.org/plugins/doi-creator/, but you’ll need to give the code a review before using it, just to be safe.

I think the cool kids are using SHA hashes and PGP signatures ))