Blockchain & Crypto Security Services

NSI Global provides independent advisory, assessment and forensic services for organisations and individuals exposed to blockchain and digital-asset risks. Services can cover smart-contract risk, wallet governance, transaction analysis, incident investigation and executive exposure.

NSI Global does not custody client assets, manage private keys or operate client wallets, exchanges or blockchain infrastructure. Services address technical, forensic and operational risk and do not constitute legal, financial or investment advice.

Our Services Include

Smart Contract Security Audit & Risk Advisory

Review smart-contract code, logic, access controls, external calls and oracle dependencies within the agreed scope. For EVM-based contracts, testing can be mapped to the OWASP Smart Contract Security Verification Standard and OWASP Smart Contract Top 10 2026.

Executive Digital Asset Risk Assessment

Assess wallet architecture, key-management practices, recovery arrangements, transaction-approval controls and exposure created by personal devices or accounts. NSI Global does not request, receive or retain seed phrases or private keys.

Crypto Investigations & Forensics

Analyse available on-chain transaction data and associated records to document asset movements, counterparties and relevant transaction paths. Findings may support legal advisers, investigators or recovery specialists but do not guarantee attribution or asset recovery.

DeFi & Exchange Exposure Assessment

Assess exchange integrations, liquidity-pool exposure, oracle dependencies, administrative controls and risks created by DeFi protocol interactions.

Custodial & Non-Custodial Risk Advisory

Assess hot, cold, multisignature and custodial wallet arrangements against operational risk, governance and recovery requirements.

Adversary Emulation for Blockchain Protocols

Conduct authorised threat scenarios involving flash-loan or oracle manipulation, compromised signing, phishing, access-control abuse and governance attack paths within agreed rules of engagement.

Adversary Emulation & Red Teaming Services

Blockchain Threat Intelligence

Monitor agreed public and lawfully accessible sources for blockchain-related phishing infrastructure, token impersonation, scams and fraud associated with specified brands, wallets or addresses.

Who We Work With

Crypto exchanges, DeFi platforms, and digital asset custodians
Fintech and Web3 Startups entering or scaling
HNWIs, Private Offices, and executives holding or transacting in digital assets
Traditional financial institutions exploring tokenised asset models

Why NSI Global?

Independent advisory model — no asset custody, token promotion or required product deployment.

Integrated expertise across cyber security, financial forensics, and blockchain ecosystems

Designed for matters involving significant privacy, regulatory and reputational sensitivity.

Frequently Asked Questions

Do you take custody of assets or keys?

No. We do not custody assets, manage keys, or require you to deploy a product. That independence is the point of the service — the advice is not shaped by something we are trying to sell you.

Can you trace stolen cryptocurrency?

We conduct blockchain tracing as part of investigations. Whether funds are recoverable depends on where they move and which services they touch, and we will tell you early if the realistic answer is that they are not.

What standards do your smart contract audits follow?

The OWASP Smart Contract Security Verification Standard and the OWASP Smart Contract Top 10, with findings reported by severity and exploitability rather than as an undifferentiated list.

Do you work with traditional financial institutions?

Yes. A growing share of this work is banks, funds and corporates assessing exposure to digital assets — held by counterparties, or on their own balance sheet — rather than crypto-native businesses.

Secure Your Digital Assets

Speak with NSI Global’s blockchain and digital-asset risk advisers. Confidential consultations are available in person or through a client-approved Webex meeting.

What this engagement does not cover.

Testing is bounded by the scope agreed in writing. We do not test systems outside that scope, and no assessment establishes that an environment is free of vulnerabilities — only that the agreed scope was examined using the agreed techniques within the agreed window. Every report states what was tested, what was not, and what the evidence does and does not support.

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