Ledger Op3n: How the Donjon Keeps Crypto Safe from Hackers

Inside Ledger Op3n: How the Donjon Team Keeps Crypto One Step Ahead of Hackers

Written by Gode S.,

Web3 Market Analyst

Last Updated: October 23, 2025

Key Takeaways

During its Op3n event, Ledger gave attendees a first-hand look at its internal security processes and culture;
Participants saw how the Ledger Donjon team actively attacks and tests Ledger devices to identify vulnerabilities;
Ledger also announced its latest device, the Nano Gen5.

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On October 23, Ledger welcomed partners and community members - including BitDegree - to its Paris headquarters for Ledger Op3n, an event dedicated to showcasing how the company advances crypto security and product innovation.

Ledger is a global leader in securing digital assets and is best known for its hardware wallets. But beyond its consumer products, the company also invests heavily in security research, a commitment best represented by its in-house team known as the Ledger Donjon.

During Op3n, participants were given a rare look into the Donjon's operations.

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This group of security researchers, experts in cryptography, software, and hardware security, spends their days attempting to hack Ledger's own devices. Their mission: to find and fix vulnerabilities before anyone else can exploit them.

The Donjon specializes in several types of security testing. These include software attacks, which target unauthorized access or manipulation of digital assets; side-channel attacks, which exploit physical leakages from devices; and fault attacks, where circuits are deliberately disrupted to expose weak points.

Through these methods, the team strengthens the safety of Ledger's products and ensures they stay ahead of threats.

Ledger Donjon's testing device for security At the event, attendees witnessed a mini expedition into how the Donjon operates - from breaking down secure elements to testing product resilience.

Ledger's CTO, Charles Guillemet, personally guided the audience through the process and offered insights into the high standards that define the company's approach to security.

Ledger Op3n: an expedition into how the Donjon operates Ledger describes Op3n as "a setting for the diverse crypto community to see Ledger from the inside." This year's event continued that tradition by combining transparency with technical depth to show the people and processes behind its trusted devices.

The event also included a major reveal: the launch of Ledger Nano Gen5, the company's latest generation of hardware wallets. What is special about this device? Read the full story.

Beyond that, Ledger also announced that its flagship software, Ledger Live, is rebranding to Ledger Wallet. What does this rebrand change? Read the full story.