> For the complete documentation index, see [llms.txt](https://sspwallet.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sspwallet.gitbook.io/docs/ssp-relay-development/overview.md).

# Overview

**SSP Relay** is the communication backbone of the [**SSP Wallet**](https://sspwallet.io/) ecosystem, enabling seamless interaction between **SSP Wallet** and **SSP Key**. By acting as a secure relay server, it facilitates synchronization, multisignature transaction management, and reliable communication without ever compromising private keys or sensitive data.

#### Key Features

* **Secure Communication**: Ensures encrypted and authenticated data transfer between SSP Wallet and SSP Key.
* **Multisignature Support**: Powers the **2-of-2 multisignature architecture**, enhancing the security of user transactions.
* **True Self-Custody**: Operates without storing or accessing private keys, maintaining the user's self-custody.
* **Scalable and Reliable**: Built with modern technologies to handle large-scale usage efficiently.