That a tag always is confusing me..
For example when I follow NIP-23, kind 30023 events can have an a-tag too correct? If so, why not for other addressable events?
They don't have an a-tag generally, no. Only other events that refer to them.
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Ah yes, now I remember!
https://github.com/nostr-protocol/nips/pull/1359
😅