Security Reviews, Secure Design, and Advisory for High-Stakes Digital Systems.

Guvenkaya Advisory helps digital asset operators, financial institutions, and security-critical technology teams secure the systems and workflows behind digital value. Trusted across blockchain ecosystems and financial technology, we provide Principal-led security reviews, secure architecture and process design, custody and key-management review, technical due diligence, and digital asset program advisory.

24M+

users protected

$19.2B+

volume secured

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Trusted By

High-stakes teams have trusted Guvenkaya to review and advise on systems where compromise can affect users, value, operations, or trust. Public references span digital asset operators, protocol teams, financial technology, custody workflows, applications, infrastructure, and security-critical architecture.

"Timur is one of the most competent auditors, specialising in Rust-based smart contract environments. He has assisted several teams in the NEAR ecosystem over the past few years and it's been a pleasure seeing him work with teams across many stages and domains."

@chronear

Head of Ecosystem Strategy, NEAR Foundation

"We worked with few known security "brands" in the past. Timur Guvenkaya and his team are different. They understand that security is a continuous process rather than one-off contract audit, they think about a wider perimeter and work in an extremely agile fashion. Most of our work now goes to them."

Oleg Fomenko

Co-Founder and CEO at Sweat Economy

"Guvenkaya are The Auditors. Deep expertise in Rust and smart contracts combined with hands-on, iterative approach make them a go-to partner for serious projects. They don't just look for bugs, they help to build robust systems from the ground up. We've trusted them with multiple audits across different stages, and continue to rely on their judgment and precision."

Arseny Mitin

Protocol Tech Lead, Aurora, NEAR Protocol

and more...

Reports & Briefings

Some clients come with a defined system that needs review. Others need executive-grade risk clarity, secure architecture or process design, custody and key-management review, custody integration and operating-model review, diligence support, or advice across a broader digital asset program. Guvenkaya supports both: bounded Security Reviews for specific targets and senior advisory for security-critical decisions in digital asset programs and other high-stakes digital systems.

Security Reviews

Focused technical reviews of applications, infrastructure, custody models, smart contracts, blockchain systems, AI systems, operational controls, and diligence targets.

Best when: you have a system, workflow, contract, or control surface that needs findings, risk context, and remediation guidance.

Discuss a Security Review

Risk Assessment

Executive-grade posture assessment across systems, vendors, people, workflows, and controls for boards, leadership teams, regulators, auditors, insurers, investors, and institutional customers.

Best when: leadership needs a board-ready view of where security risk concentrates and what to fix first.

Discuss a Risk Assessment

Secure Architecture & Process Design

Design or challenge security-critical systems, workflows, integrations, custody models, key ceremonies, and operating controls before development, launch, or major change.

Best when: you are still shaping system architecture, sensitive workflows, custody, signing, approval, recovery, vendor integration, or go-live controls.

Discuss Architecture & Process Design

Custody & Key Management Review

Review or challenge custody architecture, wallet and signing workflows, key lifecycle, approval flows, recovery paths, role separation, and vendor dependencies before launch or major change.

Best when: digital value is being stored, moved, approved, recovered, or governed.

Discuss a Custody Review

Custody Integration & Operating Model Review

Security design and production review for custody platforms and key-management systems integrated into digital asset workflows.

Best when: a custody platform or key-management system is being selected, integrated, launched, migrated, or reviewed in production after growth, audit, incident, or operational concern.

Discuss custody integration review

Digital Asset Program Advisory

Advisory for institutions and digital asset operators building, expanding, or reviewing custody, tokenization, settlement, wallet, and digital asset infrastructure.

Best when: the decision spans custody architecture, vendors, operating model, pre-launch review, or program governance.

Explore Program Advisory

Security Technical Due Diligence

Security diligence for investors, acquirers, funds, ecosystem teams, and enterprise buyers evaluating a company, vendor, protocol, or platform.

Best when: you need security judgment before an investment, acquisition, vendor selection, grant, partnership, or strategic commitment.

Discuss Diligence

Technical Training & Security Exercises

Practical training, secure-design workshops, tabletop exercises, phishing-readiness exercises, key ceremony rehearsals, playbook exercises, and readiness drills for teams operating high-stakes digital systems.

Best when: the team needs better security judgment under real operating conditions, not another generic training session.

Discuss Training & Exercises

Not sure which engagement fits?

Bring the system, risk, workflow, or decision in front of you. Guvenkaya will help identify the right review, assessment, design, or advisory path.

Discuss the right starting point

Focus Areas

Where technical depth matters most

Guvenkaya focuses on systems where failures can affect funds, trust, operations, or resilience: custody, key management, infrastructure, privileged workflows, blockchain systems, AI workflows, and security-critical applications.

Custody and key management
Secure architecture and process design
Custody platform integration models
Key ceremony design and readiness
Wallet, signer, and settlement workflows
Signing, approval, recovery, and break-glass processes
Applications and APIs around security-critical workflows
Cloud, identity, CI/CD, and infrastructure
Smart contracts and blockchain systems
Operational security and privileged paths
AI systems and agentic workflows
Technical diligence and board-ready risk documentation

Capability building

Technical Training & Security Exercises

Build secure operating habits for teams handling high-stakes digital systems. Guvenkaya runs practical training, secure-design workshops, tabletop exercises, playbook exercises, and key ceremony rehearsals for engineering, security, operations, and leadership teams.

Selected public training material

Rust security essentials: an example of the practical, issue-driven training material Guvenkaya develops for engineering and security teams.

NEAR smart contract security: a focused module for teams working with Rust-based protocols and blockchain systems.

Secure-design workshops
Rust and blockchain security training
Custody and key-management tabletop exercises
Key ceremony rehearsals
Incident and control playbook exercises
Executive or board workshops on digital asset security risk

Discuss Training & Exercises

Founder & Partner

Timur Guvenkaya founded Guvenkaya to bring senior security judgment to teams operating high-stakes digital systems.

His background spans Web2 application security, Web3 protocol review, blockchain security engineering, custody and key-management risk, and technical security education.

Before Guvenkaya, Timur established and led a security engineering practice for complex blockchain systems, with specialization in Rust-based and non-EVM ecosystems. Earlier, at Invicti Security, he helped develop JWT vulnerability-scanning technology used by Fortune 50 companies and public-sector organizations. His work now supports Guvenkaya engagements across security reviews, secure architecture and process design, diligence, advisory, and technical training.

Bring the system, workflow, or decision at risk.

Guvenkaya will help identify the right review, assessment, design, or advisory path for a defined system, architecture decision, custody workflow, diligence target, or unclear risk picture.

Start an engagement