Ian Rogers

Charles Guillemet is Chief Technology Officer at Ledger, a position he has held since July 2019. In this role, he oversees software engineering, security research, product security, infrastructure, architecture, and innovation. He joined Ledger in December 2017 as Chief Security Officer, where he founded the company's internal security research team, the Ledger Donjon, oversaw security assessments of Ledger's products, and procured independent security certifications for the Ledger Nano S and Ledger Nano X. He has led the development of open source hardware and software security tools and has overseen security assessments of competitor devices, disclosing vulnerabilities under responsible disclosure practices.

Under his technical leadership, Ledger launched two hardware wallet devices featuring secure touchscreens — the Ledger Flex and the Ledger Stax — and introduced the Ledger Recover service, which uses Shamir's cryptographic algorithm to split a user's seed phrase into three encrypted fragments distributed across three independent backup providers. He has also developed the Ledger Key Ring Protocol, a confidentiality-focused cryptographic protocol for the blockchain environment. Guillemet has spoken publicly on the quantum computing threat to elliptic curve cryptography and its implications for blockchain security. Before joining Ledger, he spent approximately ten years in cryptography and hardware security, including a role as Cryptosystems Design Expert at Tiempo S.A.S. and a position as Technical Manager at CEA-LETI ITSEF, a Common Criteria-accredited security evaluation laboratory. He also served as a lecturer at ENSIMAG. He holds a Master of Science in Cryptography and Security from ENSIMAG, where he graduated as valedictorian, and a Master 2 in Security, Cryptology and Coding of Information Systems from Université Joseph Fourier.

Nicolas Bacca is Chef at zknox, a role he has held since February 2025, where he focuses on defensive technologies and decentralization within the crypto space. He also serves as Metaverse Finder at Le Centre, a company supporting cultural institutions through digital tools, a position he has held since April 2022.

Bacca co-founded Ledger in November 2014 and served there until September 2023, most recently as Co-Founder and VP Innovation. During his tenure, he played a central role in making smart card technology usable for the general public and in developing Ledger's hardware wallet line. He left Ledger after nearly a decade, citing a preference for smaller, faster-moving structures. Prior to Ledger, he created BTChip, an open-standard secure element-based hardware wallet that became the first version of the Ledger wallet. He also founded Ubinity, which developed smartcard operating systems, and co-founded Simulity, where he served as CTO from 2005 to 2012. Earlier in his career, he spent five years at Oberthur Technologies working on card systems and mobile solutions, finishing as R&D Solution Architect. He has made angel investments in companies including Morpho Labs and Bitstack. Outside his commercial roles, he coordinated the effort to freeze cryptocurrency ransoms during the kidnapping of David Balland, assembling a team of lawyers and security specialists to send freeze requests to exchanges and stablecoin issuers in real time. Bacca is a graduate engineer from ENSICAEN.

Pascal Gauthier is Chairman and CEO of Ledger, a Paris-headquartered manufacturer of hardware cryptocurrency wallets. He became CEO in January 2019, succeeding co-founder Eric Larchevêque, and was appointed Chairman in December 2020. He had previously joined Ledger as a seed investor and board member in 2014, and served as President from 2017 before assuming the CEO role. Under his leadership, Ledger expanded its product line to include Ledger Live, a digital asset management application, and Ledger Stax, a consumer hardware device. He has publicly advocated for self-custody of crypto assets, arguing that centralised platforms should be used to buy and sell cryptocurrencies rather than to hold them.

Gauthier co-founded Kaiko, a financial data platform focused on Bitcoin and digital asset market data, in 2014. He serves as a board member at Komainu, a regulated digital asset custody solution established as a joint venture between Nomura, Ledger, and CoinShares. Earlier in his career, he was COO at Criteo, the advertising technology company, where he contributed to the company's expansion to a EUR 2.17 billion market capitalisation. Prior to Criteo, he was involved with Kelkoo, a price comparison service sold to Yahoo for EUR 475 million. Before joining Ledger as President in 2017, he worked as a Venture Partner at Mosaic Ventures, a London-based venture capital firm focused on Series A investments.

Sébastien Badault is VP of Enterprise at Ledger, where he leads the company's push into institutional-grade digital asset services. His mandate covers enterprise custody, governance and a suite of integrated services including off-exchange trading through Ledger's Tradelink product, staking, treasury management and payments. In this capacity he works with banks, asset managers and fintechs seeking to bridge traditional finance into digital assets using Ledger's hardware-backed security infrastructure.

Badault joined Ledger in an earlier role as VP of Metaverse and Web3, where he oversaw Ledger's Web3 strategy and the company's tools and services related to NFTs, gaming and brand collaborations, working directly with CEO Pascal Gauthier and Chief Experience Officer Ian Rogers. Prior to Ledger, he served as Managing Director for France, Belgium and Luxembourg at Alibaba, where he built the company's Luxury Pavilion. Before Alibaba, he was among the first employees at both Google France and Amazon France, leading sales and marketing teams to build local market share for each organisation.