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+---
+layout: project
+title: sydent
+categories: projects other
+description: The official Matrix Identity Server implementation
+author: Matrix.org team
+maturity: Stable
+---
+
+# {{ page.title }}
+sydent is an implementation of the Matrix Identity Server API in Python, supporting:
+ * Validation of 3PIDs (email and MSISDNs) for signup and discovery
+ * Binding of 3PIDs to MXIDs (for discovery)
+ * Lookup of 3PIDs to MXIDs
+ * Storing unresolved 3PID invites.
+ * Replication of assertions across a closed federation.
+
+Instances currently run at matrix.org and vector.im; meanwhile others are free to run their own but they will not be able to participate in the global directory lookup table.
+
+N.B. use of the Identity Server API is stricly optional in Matrix - it's only used to resolve 3PIDs to MXIDs.
+
+Get the code from [GitHub](https://github.com/matrix-org/sydent)
+
+Alternatively, [slipeer](https://githcub.com/slipeer) maintains a [fork with LDAP lookup](https://github.com/slipeer/sydent).