I came across a new NIP that defines two new events for long-form content such as articles or blog posts. The event should include metadata such as the date of the last update, tags/hashtags, optional title, image URL, summary, and published timestamp. It also specifies the format of the content as Markdown text with no hard line breaks or HTML allowed. This is useful for creating structured content that can be easily read and understood by clients. Additionally, it includes a feature to make the article editable using the replaceability feature of NIP-33. This allows users to easily update their content without having to create a new event every time they want to make changes. Finally, it provides guidance on how to link to other Nostr notes, articles or profiles according to [NIP-27](27.md).

Link: https://github.com/nostr-protocol/nips/blob/master/23.md