Ledger Documentation Hub

Note

This documentation is intended for developers only and not general users.

Ledger produces personal security devices such as the Ledger Nano S and the Ledger Blue, both of which are architected around a Secure Element and the BOLOS platform.

This documentation contains information about developing apps for these devices, from high-level concepts like hierarchical deterministic key generation to low-level details about the hardware architecture of these devices.

Background Information

• Introduction
• Personal Security Devices
• The Master Seed
• HD Key Generation
• Applications of HD Trees
• Application Isolation

BOLOS Platform

• Introduction
• Overview
• BOLOS Features
• Hardware Architecture
• Application Environment

Userspace Development

• Introduction
• Setup
• Writing Apps
• Display Management
• Advanced display management
• Low-level display management
• Interaction Between BOLOS and Apps
• Application Structure and I/O
• Persistent Storage and PIC
• Memory alignment
• Common Pitfalls and Troubleshooting
• Application Debug
• Emulating devices with Speculos

Additional Resources

• Publishing an Application
• External Documentation
• Developing Secure Ledger Apps