What we do

Ledger builds solutions to bridge the physical world and the blockchain. We have three families of products: Personal Security Devices for end users, Hardware Security Modules for servers and Hardware Oracles for connected objects, machines and IoT.

Ledger secure plaform products


Ledger’s core technology is a low footprint embedded Operating System built for Secure Elements and CPU enclaves. Thanks to its innovative asynchronous architecture, Ledger OS enables full orchestration of code and systems directly from the secure world.

The missing link

Blockchain applications live in their own digital realm, totally orthogonal to the physical world. In order to exist and solve real life problems, they must interface with human operators or machines through atomic transactions and contract function calls. As much as a blockchain is intrinsically secure thanks to its consensus based mechanism, the global security architecture ultimately depends on the reliability of the inputs fed to the system. If transactions generation is compromised, or if a data source is corrupted, the whole security model collapses.

Ledger solves this major security issue by providing a trust layer between the IT system and the physical world: security devices to keep private keys out of reach of hackers and ensure a proof of presence of the user to mitigate man in the middle attacks, security modules for servers to enforce hard rules, and hardware oracles to measure and attest the existence of physical events (GPS location, vehicle speed, power consumption…).

Personal Security Devices

for users and operators

Ledger Nano S

Ledger Nano S

The Ledger Nano S is a Bitcoin and Ethereum hardware wallet, featuring a screen for payment validation and architected around a secure element for maximum protection of your assets.

Ledger Blue

Ledger Blue

The Ledger Blue is a high end signature device, featuring a touch screen and USB/NFC/BLE connectivity for PC and smartphone compatibility. It runs multiple apps such as Bitcoin, Ethereum, FIDO U2F, SSH, GPG and many more. The Blue is the most advanced open source secure device available.

Ledger Nano

Ledger Nano

The Ledger Nano is a small USB hardware wallet, that integrates an EAL5+ certified Secure Element (smartcard) and the Ledger OS. It provides a simple and smart user experience, so that anyone can use Bitcoin with the benefit of maximum security.

Ledger HW.1

Ledger HW.1

The HW.1 is the enterprise version of the Nano, available for multisignature schemes or HSM implementation arrays. With an affordable and durable plastic casing, the HW.1 is the ideal solution for heavy usage and multiple keys distribution.

Cloud security

for servers & infrastructure (HSM, SGX, TEE)

Ledger HSM

Hot wallet security is a critical aspect of all online exchanges and brokers. Ledger HSM is an enterprise solution built in partnership with major vendors enabling a full logical and physical security of cryptographic secrets on servers. Architected around BOLOS core, secure wallet apps can rely on 2FA oracle channels validating in real time the integrity of any payment requests.

Hardware Oracles

for connected objects, IoT and IIoT

Hardware Oracles

Hardware oracles are cryptographically attestable anti-tampering sensors feeding blockchain based applications with certified data sources. As data integrity of the measure is proven by a chain of trust, physical events (temperature, power consumption, vehicle speed...) can be used into critical or financial environments.

Hardware Oracles


Blockchain Open Ledger Operating System (BOLOS) is an embedded secure OS powering Secure Elements (SE), Hardware Security Modules (HSM), CPU enclaves (Trusted Execution Environment -- TEE, Intel SGX). Contrary to legacy solutions such as Java Card or other industry OS, Ledger features an asynchronous architecture which enables a full orchestration of business code directly from the secure world. BOLOS is an unobtrusive framework allowing to run multiple applications all in isolations from each other, and build open source native code which will be portable from one secure platform to another.


The Hardware Abstraction Layer (HAL) allows BOLOS to run on any kind of secure hardware. Thanks to the extensive crypto APIs, applications can leverage all types of blockchains (public, private...)


BOLOS breakthrough innovative architecture enables orchestration of embedded systems directly from the secure element. This enables proof of execution and origin, adding cryptographic attestation and integrity to critical data sources.


Isolation is natively provided by hardware mechanisms (each application can only access its own memory region, and operates in User mode, interacting with the Operating System running in Supervisor mode) or through a simple virtual CPU engine.


All applications running on BOLOS can be Open Source and do not require any proprietary API. Native code (C) ensures maximum performance and flexibility.

About us

Founded in 2015, Ledger is a French startup building a trust platform for the physical world. With a unique combination of expertise in embedded OS, secure hardware, cryptography and blockchain, the company aims to leverage its technology in various fields, from enterprises to consumers, with a current focus on industrial markets. Ledger is headquartered in Paris, and has offices in Vierzon and San Francisco.

Sign up to our newsletter

Receive Ledger updates


Eric Larchevêque
Eric Larchevêque

Serial entrepreneur since 1996, Eric founded several companies in Europe. Respected member of the Bitcoin community, he launched La Maison du Bitcoin - a French Bitcoin center, before co-founding Ledger.

Nicolas Bacca
Nicolas Bacca

After 5 years at Oberthur and 10 years developing smartcard OS for his company Ubinity, Nicolas founded BTChip, an open standard secure element based hardware wallet that is now part of Ledger.

Joël Pobeda
Joël Pobeda

Joël is head of product and operations. After 15 years in the retail and distribution business, he co-founded Ledger with the aim to bring the best solutions to consumers.

Thomas France
Thomas France

Thomas is head of the San Francisco offices of Ledger, where he is in charge of developing business operations. Want to partner with us? Ping him any time on Twitter or by email to meet him there.

Contact us

You are welcome to visit us in our Paris and San Francisco offices.

Ledger SAS

35 rue du Caire
75002 Paris - France

Ledger Technologies Inc.

4 Embarcadero Center - Suite 2550
94111 San Francisco - United States
tel: +33 9 67 30 01 71