---
type: entity
title: Matrix-ID
tags: [identifier, matrix]
related: [matrix, matrix-id-anonymization]
created: 2026-06-30
updated: 2026-06-30
sources: ["output/rz_uni_greifswald_de_dienste_allgemein_instant_messaging_chat_matrix.md", "output/rz_uni_greifswald_de_dienste_allgemein_instant_messaging_chat_matrix_datenschutz.md"]
---

# Matrix-ID

The Matrix-ID (MXID) is the unique identifier for users on the Matrix platform.

## Properties and Lifecycle
- **Assignment**: Automatically derived from the university account upon request.
- **Permanence**: Technically, a Matrix-ID cannot be deleted by the server administrator to prevent the same ID from being assigned to a different person in the future.
- **Anonymization**: To comply with privacy laws, the [[universitatsrechenzentrum-urz]] uses randomly generated numbers for the ID. This ensures that after an account is deleted, the ID is no longer linkable to a specific person ([[matrix-id-anonymization]]).
- **External Storage**: Matrix-IDs are stored permanently on the external servers of any communication partners.