Matrix is an open protocol for secure, decentralised communication - defining an end-to-end-encrypted real-time communication layer for the open Web. Historically the network has been made up of newly written native Matrix clients, or bridges to 3rd party existing chat systems (e.g. Slack, Discord, Telegram). The matrix-rust-sdk is a modular Matrix client library, meant to be a robust implementation of the protocol, and to make even the most advanced features such as E2EE easy to use. This talk will walk you through the design decisions and the tradeoffs that come with it, give you an overview of where we're at and where we're going with Web-Assembly, and finally what the future holds for the matrix-rust-sdk. Finally it will be connected to a real-life example of software using the matrix-rust-sdk: Fractal-Next.