---
title: "URN: definition | KYE Protocol™ glossary"
description: "URN: The canonical identifier format."
url: https://kyeprotocol.com/glossary/urn/
lang: en
source: "KYE Protocol"
---

> URN: The canonical identifier format.

Core protocol

# URN

The canonical identifier format.

The canonical identifier format. `kye:<class>:<trust-domain>:<subclass>:<local>`. Stable, namespaced, human-readable. Defined in `public/id-format/`.

KYE™ Minute explains this term in an episode dated 21 October 2026, once podcast audio is switched on.

**Source** The KYE Protocol™ glossary, [as published](https://kyeprotocol.com/glossary/#urn). Not legal advice.