User profile
If you are new to developing Ledger embedded apps
Please read this section entirely.
If you already understand BOLOS and Personal Security Devices (PSDs)
You can skip the first paragraph and go to Things to do.
Development phases

Things to know
BOLOS is the operating system behind all Ledger personal security devices. It provides a lightweight, open-source framework for developers to build source code portable applications that run in a secure environment.
Learn about the BOLOS platform
Personal Security Devices (Learn - PSDs)
Ledger Personal Security Devices allow users to store cryptographic secrets and sign transactions securely and conveniently. It is important to understand how they work before coding an embedded application.
Learn about the personal security devices
Things to do
Joining Discord is not required to code your embedded application, but it will be easier to meet with our team and discuss the specifics of your project. Join us on the Ledger’s Discord server and introduce your project in the #nano-app channel.
Process & Requirements
Make sure you understand the Process and follow the Requirements starting here. The Guidelines will also help you with certain technical topics.
Code
Embedded applications are coded in C on the Blockchain Open Ledger Operating System (BOLOS).
To develop an embedded application you will need to:
Other languages are possible (no details here).
Contribute
If you want to improve the documentation you can use the comment box at the bottom of each page, or open a pull request on our repository