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Concepts

Matrix

The following concepts are part of the Matrix ecosystem and specification.

3PID

3PID stands for Third-Party Identifier.
It is also commonly written:

  • 3pid
  • tpid

A 3PID is a globally unique canonical identifier which is made of:

  • Medium, which describes what network it belongs to (Email, Phone, Twitter, Discord, etc.)
  • Address, the actual value people typically use on a daily basis.

mxisd core mission is to map those identifiers to Matrix User IDs.

Homeserver

Where a user account and data are stored.

Identity server

An Identity server:

  • Does lookup of 3PIDs to User Matrix IDs.
  • Does validate 3PIDs ownership, typically by sending a code that the user has to enter in an application/on a website.
  • Does send notifications about room invites where no Matrix User ID could be found for the invitee.

An Identity server:

  • DOES NOT store user accounts.
  • DOES NOT store user data.
  • DOES NOT allow migration of user account and/or data between homeservers.

3PID session

The fact to validate a 3PID (email, phone number, etc.) via the introduction of a token which was sent to the 3PID address.

mxisd

The following concepts are specific to mxisd.

Identity store

Where your user accounts and 3PID mappings are stored.

mxisd itself DOES NOT STORE user accounts or 3PID mappings.