This repository has been replaced by https://github.com/LedgerHQ/ledger-secure-sdk/.

**Please read the new repository README for more information. **

Nano S Secure SDK

This directory contains the SDK for ST31 applications development

Make sure to use the tagged version matching your development environment as syscalls IDs might have changed

On firmware version 1.6+, 2 SDK branches are temporarily available

• The main branch tracks the updated SDK merging Nano X UI features (Flow) currently only used for a few appilcations (Bitcoin, Ethereum, SSH, U2F)

• The og- branches track SDKs compatible with 1.5.5

Developers are encouraged to migrate their application to the updated SDK to create portable applications between Nano S and Nano X devices

Are you developing a Nano S application?

If so, you must use this SDK.

For a smooth and quick integration:

• See the developers’ documentation on the Developer Portal and
• Go on Discord to chat with developer support and the developer community.