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Ledger Nano/Blue apps emulator
Objective-C Python C CMake Shell Makefile
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apps init Nov 12, 2019
doc doc: update Nov 13, 2019
scripts init Nov 12, 2019
sdk init Nov 12, 2019
src Pad secret x/y length to 32 in secp256k1 ecdh Nov 25, 2019
tools init Nov 12, 2019
vnc vnc: winamp: make the skin argument optional Nov 14, 2019
.clang-format init Nov 12, 2019
.dockerignore init Nov 12, 2019
.gitignore init Nov 12, 2019
CMakeLists.txt Install OpenSSL without man pages Nov 13, 2019
COPYING init Nov 12, 2019
Dockerfile init Nov 12, 2019
Pipfile init Nov 12, 2019
Pipfile.lock init Nov 12, 2019 init Nov 12, 2019 fix retrieval of stack address on some apps Nov 25, 2019


screenshot btc nano s

The goal of this project is to emulate Ledger Nano and Ledger Blue apps on standard desktop computers, without any hardware device. More information can be found here:

Usage example: ./ apps/btc.elf.

Bugs and contributions

Feel free to open issues and create pull requests on this GitHub repository.

Please ensure that tests still pass.


The emulator handles only a few syscalls made by common apps; for instance, syscalls related to app install, firmware update or OS info can't be implemented.

There is absolutely no guarantee that apps will have the same behavior on hardware devices and Speculos.


Apps can make arbitrary Linux system calls, thus don't run Speculos on untrusted apps.

It's worth noting that the syscall implementation (src/) doesn't expect malicious input. By the way, in Speculos, there is no privilege separation between the app and the syscalls. This doesn't reflect the security of the firmware on hardware devices where app and OS isolation is enforced.

Speculos is not part of Ledger bug bounty program.

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