[1] Users can send one-to-one and group messages, which can include voice notes and images.
[2] xx messenger uses usernames as identifiers which can be optionally attached to standard cellular telephone numbers or email addresses for contact discovery.
[6] An alpha version of xx messenger was first presented on January 6, 2016 by David Chaum at the Real World Crypto conference with the stated goal of demonstrating a new type of mix network encryption scheme.
[7] xx messenger was released to the public as a mobile app on Android and IOS on 25 January 2022.
Messages sent by users of xx messenger are grouped in batches of 1,000 and routed through a subset of cMix nodes.