Auditing Digital Assets: Building a Stronger Evidence Base with LedgerLens

Digital assets are no longer sitting on the edge of the audit conversation.

More companies are holding crypto assets, receiving payments in stablecoins, operating wallets, offering custody services, tokenising real-world assets, or building businesses around blockchain infrastructure. For audit firms, this creates a real opportunity, but also a practical challenge.

How do you audit something that lives across public blockchains, private keys, exchange accounts, internal ledgers, smart contracts and sometimes thousands of wallet addresses?

The answer isn't to move away from audit fundamentals. It's to apply those fundamentals properly, using tools built for the environment.

That is where LedgerLens can help.

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Digital asset audits still need to follow audit standards

LedgerLens is not a substitute for an auditor's professional judgment. It's a tool for gathering the evidence required to meet the relevant assurance standards.

For Chartered Accountants and audit teams working with digital asset clients, the fundamental audit approach remains unchanged. Auditors must still understand the entity and its activities, identify and assess risks, design appropriate responses, obtain sufficient appropriate audit evidence, and document the work performed and conclusions reached.

What changes is the evidence itself.

Instead of only working with bank statements, general ledgers and third-party confirmations, auditors may need to work with blockchain balances, wallet ownership tests, transaction hashes, internal customer liability records, custody arrangements, staking activity, exchange reports and pricing data.

This is where manual testing through block explorers and spreadsheets becomes inefficient, inconsistent and hard to evidence properly. There's also a more basic problem: can you trust the source of the data in the first place?

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The core audit questions do not change

When auditing clients with digital assets, the same audit assertions remain relevant.

The auditor still needs to consider questions such as:

Does the asset exist?

Is the wallet list complete?

Does the client control the wallet or private key?

Are transactions recorded accurately and in the correct period?

Are customer liabilities complete?

Is the valuation methodology appropriate?

Are digital assets properly presented and disclosed?

These aren't "crypto questions" only. They are audit questions, applied to a blockchain environment.

LedgerLens is useful because it helps firms perform and document procedures around these areas in a structured way. The LedgerLens Auditor’s Workbench is designed to support audit procedures around completeness, accuracy, existence and ownership of digital assets, including historical balance testing and bulk address queries across multiple blockchains.

1. Historical balance testing

One of the first practical challenges in a digital asset audit is confirming balances at the reporting date.

A blockchain explorer may show the current balance of an address, but that's not always enough for an audit. The auditor often needs to confirm the balance at a specific date, time or block height.

LedgerLens helps by allowing audit teams to retrieve historical balances for wallet addresses as at the balance sheet date. This is especially useful where clients hold assets across multiple chains or multiple wallets, since it avoids relying on manual "roll-back" calculations or screenshots taken from different explorers. These historical balance query tools help create a more consistent and repeatable testing process.

From an audit perspective, this supports procedures around existence, accuracy and cut-off. It also helps create a clearer audit trail, because the balance testing is performed in a consistent, repeatable way.

2. Wallet ownership and control

In digital asset audits, seeing an on-chain balance is not enough.

A wallet may hold assets, but the auditor still needs to consider whether the client controls that wallet and whether the asset belongs to the client. In practice, this may involve procedures such as cryptographic signature testing or send-to-self transactions, where the client demonstrates control over the relevant private keys for specified wallet addresses.

Procedures such as cryptographic signature tests and send-to-self transactions can provide evidence that a company controls the private keys for specified wallet addresses.

That said, control of a private key is not automatically the same as legal ownership. The auditor still needs to consider the broader facts, including custody agreements, related-party arrangements, restrictions, encumbrances, customer terms, and whether the wallet holds corporate assets, customer assets, or a mixture of both.

So the tool supports the evidence-gathering process, but the audit conclusion still belongs to the auditor.

3. Completeness of wallet addresses

One of the most difficult parts of a digital asset audit is completeness.

A client can provide a list of wallets, but how does the auditor know that list is complete?

Auditors may need to identify all company wallets, check transactions, consider hidden related-party arrangements and make sure records are complete. A strong approach to completeness also includes obtaining a comprehensive wallet list, monitoring for missing wallets and analysing wallet flows for anomalies.

LedgerLens makes it easier to analyse wallet lists, balances and transaction activity within a single environment, rather than testing addresses individually across multiple block explorers.

This doesn't remove the need for professional scepticism. The auditor still needs to understand the client's wallet architecture, exchange accounts, custody arrangements, internal controls, and how wallet addresses are created and managed.

But it gives the audit team a stronger technical base from which to perform those procedures.

4. Customer liabilities and proof of reserves

For exchanges, custodians, stablecoin issuers and other platforms that hold assets on behalf of customers, the reserve balance represents only one side of the equation.

An on-chain balance may demonstrate that assets exist, but the auditor must also consider the corresponding customer liabilities. This is often more complex because customer balances are typically recorded within the client’s internal systems rather than directly on-chain.

As these liabilities are generally maintained as internal ledger entries, the auditor needs to understand the underlying database architecture, data-extraction processes, scripts and reports used to produce the liability population. This is a critical part of assessing customer liabilities within a crypto exchange or custodial environment.

LedgerLens supports proof of reserves engagements by helping firms process customer liability data, generate Merkle Trees and provide customers with a way to verify that their balances have been included without exposing the full liability dataset. The LedgerLens Proof of Reserves toolkit also supports Merkle Tree verification, on-chain attestations and real-time monitoring.

This is particularly valuable where firms want to provide more than a point-in-time confirmation of wallet balances. A well-designed proof of reserves engagement should address both reserves and liabilities, while clearly defining the criteria, scope, timing and limitations of the work performed.

Where the engagement does not form part of a financial statement audit, the firm must also determine the appropriate assurance and reporting framework. Depending on the nature of the subject matter, the criteria applied and the agreed engagement terms, assurance work outside an audit or review of historical financial information may be conducted under ISAE 3000 (Revised).

5. Valuation support

For crypto assets such as bitcoin or ether, the auditor may need to understand the client's valuation policy, pricing source, principal or most advantageous market, cut-off timing, and whether the methodology is consistent with the applicable financial reporting framework.

LedgerLens can assist by providing reliable balance and transaction data, but the auditor still needs to assess whether the valuation approach is appropriate. In practice, this may involve using multiple price sources, checking cut-off procedures, testing impairment calculations and reviewing fair value methods as part of the broader crypto audit process.

In other words, LedgerLens helps with the technical evidence base, but it doesn't decide the accounting treatment.

6. Better audit files, not just faster testing

One of the biggest benefits of purpose-built tooling isn't just speed, it's consistency.

When audit teams rely on manual block explorer searches, screenshots and spreadsheets, it becomes more difficult to maintain a clear and reliable audit trail. Procedures may be performed differently across team members, supporting evidence can be difficult to reproduce, and large populations of wallet addresses quickly become cumbersome to manage.

LedgerLens gives firms a more structured way to perform digital asset procedures, particularly across engagements involving multiple assets, blockchains and wallet addresses.

This supports both audit quality and team efficiency.

It also enables firms to develop a repeatable methodology for digital asset engagements. This is increasingly important as digital asset audits move beyond isolated specialist assignments and become part of firms’ broader audit and assurance offerings.

7. Supporting firms that want to grow their digital asset services

Many audit firms already work with clients that have some form of digital asset exposure..

Some clients may hold digital assets on their balance sheets, while others may operate exchanges, issue stablecoins, provide custody services, manage tokenised real-world assets or interact with decentralised finance protocols. In each case, the audit team must understand the nature of the activity, assess the associated risks and design appropriate audit or assurance procedures.

LedgerLens helps firms move beyond ad hoc, manual testing towards a more structured and scalable approach to digital asset engagements. It can support:

• Digital asset balance testing

• Wallet ownership procedures

• Bulk address testing

• Historical balance retrieval

• Proof of reserves engagements

• Merkle Tree liability verification

• On-chain reserve transparency

• Real-time or more frequent reserve monitoring

• Audit documentation and reporting workflows

This makes it easier for firms to serve digital asset clients without having to build internal blockchain infrastructure from scratch.

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Final thoughts

Digital asset audits are not about replacing established audit principles with blockchain terminology. They are about applying those principles effectively within a new and often more complex evidence environment.

Auditors must still understand the entity, assess risk, evaluate controls, test information produced by the client, obtain sufficient appropriate audit evidence and document the conclusions reached. LedgerLens helps make this process more practical, particularly where blockchain data is fragmented, technically complex or too time-consuming to test manually.

For firms auditing clients with digital asset exposure, tools like LedgerLens can help bridge the gap between audit methodology and blockchain reality.

It does not replace the auditor. It gives auditors a stronger, more structured way to perform the work.