GM Arbitrum community,
I’m Mateusz Jędrzejewski, Chief Information Officer at Nethermind, and I’m pleased to announce my candidacy for the March 2026 Arbitrum Security Council on behalf of Nethermind.
About Me
I lead infrastructure and operational security at Nethermind, one of the most widely deployed Ethereum infrastructure organizations in the ecosystem. My work spans organizational security practices, key management, incident response protocols, and cross-team coordination, precisely the disciplines the Security Council demands. I am fully doxxed and available for off-hours emergency response.
About Nethermind
Nethermind builds and maintains the Nethermind Ethereum execution client, one of the two dominant clients on mainnet. Our security division has conducted 400+ smart contract audits and formal verification engagements across major EVM protocols, with auditors having reviewed over 1M+ lines of code and published 240+ articles since 2022. We are whitelisted in the Arbitrum Audit Programme (AAP), with audits completed or in progress under AAP including Palpitada, Fairblock, and IDOS.
Why Nethermind for the Security Council
The Security Council requires members who can independently evaluate proposed emergency upgrades under time pressure and act decisively. This is something Nethermind’s security team does as a core function. Specific qualifications I bring on behalf of the organization:
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400+ smart contract security audits completed across major EVM protocols
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Formal verification practice with deep zkVM expertise, actively expanding into EVM smart contract verification
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Active participation in security incident response, including cross-protocol war room scenarios
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Multi-timezone organizational depth ensuring genuine emergency availability
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Established OpSec practices directly consistent with the hardware wallet and key management requirements of this role
Conflict of Interest Statement
Nethermind has no competitive relationship with Arbitrum or its core infrastructure. We do not operate competing L2s or governance systems. We provide services to protocols deployed across multiple chains including Arbitrum, and our work is in the best interest of ecosystem security.
Commitment
I personally commit to the full scope of Security Council responsibilities: emergency availability including off-hours response, participation in security drills and flag day events, transparency reporting after emergency actions, and confidentiality until post-mortems are published. Nethermind as an organization stands behind this commitment.
Happy to answer any questions from delegates below.
Mateusz Jędrzejewski
Chief Information Officer, Nethermind