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Concepts

Core ideas behind Octothorpe Protocol — what octothorpes, backlinks, and related features are and how they work.

Last modified 2026-05-01

Octothorpe Protocol is built on a small set of link relationship types. This section explains what each one is and how OP implements it.

In this section

Hashtags — How OP turns links into distributed hashtags that work across independent websites, without a shared platform.

Backlinks — How two-way links work: creating them, endorsing incoming ones, and using them for webring membership.

Tags on Links — How to attach terms to bookmarks, citations, and other link relationships using data-octothorpes.