However, I do wonder if we have some kind of way to know the `updated_at` time besides `created_at` for articles. Rendering such time info will let readers know this article has been updated. I know WeChat has impl such a pattern in its blogging platform (which is also the largest blogging platform in China)

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In this NIP `created_at` will be equivalent to `updated_at`. The actual `created_at` would have to be in an extra metadata field, which is fine by me.