Mateusz Jędrzejewski (Nethermind) - Candidate for Arbitrum Security Council (March 2026)

Security Council Security Council Elections
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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:

  • 400+ smart contract security audits completed across major EVM protocols

  • Formal verification practice with deep zkVM expertise, actively expanding into EVM smart contract verification

  • Active participation in security incident response, including cross-protocol war room scenarios

  • Multi-timezone organizational depth ensuring genuine emergency availability

  • 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

https://x.com/matilote | https://github.com/matilote

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Congratulations on your candidacy + Technical Inquiry regarding Economic IR

"GM Mateusz,

Congratulations on your candidacy for the Arbitrum Security Council. As the Arbitrum ‘New User of the Month’ for March 2026, I’ve been closely following the candidates who prioritize infrastructure and operational security.

Your focus on incident response protocols and cross-team coordination is exactly what the ecosystem needs to move beyond reactive security. I have a technical question regarding your vision for the Council:

How do you envision the Council’s role in Economic Incident Response when dealing with sophisticated ‘Peel Chain’ distributions or cross-chain bridge hops that often bypass standard constitutional limits?

I’ve been exploring this specific ‘Trust Gap’ through my own research and have built a small stack of tools to address it:

Project Sentinel: An Economic IR Playbook designed to protect the ecosystem at the application layer where the Council’s direct intervention is limited.

Aegis-ZK: A stealth transaction simulator that uses ZK-proof logic to visualize private state transitions and protocol-level security invariants.

Link:- Aegis-ZK · Stealth Transaction Simulator

ChainTrace v2.0: An AML intelligence tool specialized in detecting Mixer Hops and Peel Chain segments in real-time.

I would value your ‘Shark’ perspective on how automated AML forensics (like ChainTrace) can be better integrated into the Council’s manual ‘War Room’ scenarios.

Link:- ChainTrace — AML Wallet Intelligence

Looking forward to your thoughts and wishing Nethermind the best in the elections.

Best,

Eklavya (Veteran)

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Thanks for putting this forward. The security and incident-response experience you highlight from Nethermind is clearly valuable for the Security Council. At the same time, it would be helpful if you could clarify (a) how you see the balance between your personal accountability vs. Nethermind’s organizational role, and (b) what concrete guardrails you envision to avoid over-concentration of vendor influence in Arbitrum’s security stack.