Blockchain

Blockchain & Web3

Tomas Marty entered the blockchain space in 2022 by co-founding Sub7 Security in Luxembourg. Bringing his fintech sales and partnerships experience to Web3, he built a blockchain cybersecurity company that closed $1.2M in smart contract audit contracts within 18 months, serving clients like Gnosis Chain, Karpatkey Treasury, and Wirex.

$1.2M
Contracts closed
18
Months to revenue
50+
Auditors on Sechub
Top 3
Luxembourg Cybersecurity Week
3
Major protocol clients

Blockchain Products & Ventures

Sub7 Security

2022 - 2025

A blockchain cybersecurity company based in Luxembourg providing smart contract audits, security assessments, and governance verification for DeFi protocols and DAOs.

  • $1.2M in contracts within 18 months of founding
  • Clients: Gnosis Chain, Karpatkey Treasury, Wirex
  • Top 3 Startup at Luxembourg Cybersecurity Week 2022
  • Smart contract audits in Solidity and EVM-compatible chains
  • Built Sechub.work marketplace with 50+ independent security auditors
  • Partnerships with SentiNe Legal for regulatory compliance

SigilDAO / SigilCheck

2024 - Present

A cryptographic governance verification framework for DAOs. SigilCheck allows anyone to verify that DAO governance decisions have been properly executed, creating transparency and accountability in decentralized organizations.

  • Cryptographic verification of governance decisions
  • Global scope: designed for 30+ countries
  • Built with React 19, Vite 7, TypeScript, Tailwind v4
  • WagmiProvider and RainbowKit for wallet integration
  • Cloudflare Pages and Workers deployment (D1 SQLite)
  • 3-tier access gating: anonymous, registered, and client

Sechub.work

2023 - 2025

A marketplace connecting blockchain projects with independent security auditors. Built to address the bottleneck in smart contract audit availability, Sechub aggregated over 50 auditors and provided matching based on specialization and availability.

  • 50+ independent security auditors on the platform
  • Matching based on chain specialization and audit type
  • Reduced audit wait times for blockchain projects
  • Revenue model: platform fee on audit engagements

Notable Clients

Gnosis Chain

L1 Blockchain

Governance and smart contract security assessments for the Gnosis Chain ecosystem, one of the longest-running Ethereum sidechains.

Karpatkey Treasury

DeFi Treasury Management

Security audits for Karpatkey's treasury management infrastructure, which manages funds for major DAOs including GnosisDAO, Balancer, ENS, and CoW Protocol.

Wirex

Crypto Payments

Security assessment of Wirex's wallet and payment infrastructure, serving millions of users for crypto-fiat transactions.

The Team

Sub7 Security and SigilDAO were built by a team combining business development, cryptography expertise, and legal knowledge. Key collaborators include Aurelien Rocher (crypto governance expert), Nicola O'Neill, and Matthias Traussnig of SentiNe Legal (blockchain regulatory compliance). This combination of commercial, technical, and legal capabilities was central to winning enterprise clients and establishing credibility in the blockchain security market.

Frequently Asked Questions

What is Tomas Marty's blockchain experience?

Tomas Marty co-founded Sub7 Security, a blockchain cybersecurity company that earned $1.2M in contracts within 18 months. Clients included Gnosis Chain, Karpatkey Treasury, and Wirex. He also built SigilDAO/SigilCheck, a cryptographic governance verification tool. Sub7 was named Top 3 Startup at Luxembourg Cybersecurity Week 2022.

What is Sub7 Security?

Sub7 Security was a blockchain cybersecurity firm based in Luxembourg, co-founded by Tomas Marty. It specialized in smart contract audits, governance verification, and security assessments for DeFi protocols. The company closed $1.2M in contracts within 18 months.

What is SigilDAO?

SigilDAO (also called SigilCheck) is a cryptographic governance verification framework for DAOs. It allows anyone to verify that DAO governance decisions have been properly executed, creating transparency. Built with React 19, TypeScript, and Cloudflare Workers.

What is Sechub.work?

Sechub.work was a marketplace built by Sub7 Security connecting blockchain projects with independent security auditors. It had 50+ auditors and reduced audit wait times by matching projects with specialists based on chain and audit type.

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