Introduction to Cryptocurrency Transactions

Cryptocurrency refers to a digital or virtual asset that uses cryptographic techniques to secure transactions, control the creation of additional units, and verify the transfer of ownership. Unlike traditional fiat currencies, cryptocurrencies are typically decentralized, meaning they are not issued or regulated by a central bank. In the United Kingdom, the tax treatment of cryptocurrency transactions is governed by HM Revenue & Customs (HMRC), which classifies gains as either capital gains or trading income depending on the nature of the activity. Understanding the foundational terminology is essential for accountants who must evaluate the financial impact of cryptocurrency holdings, assess the tax implications of disposals, and prepare accurate financial statements that reflect the underlying economic reality.

The term blockchain describes the distributed ledger technology that underpins most cryptocurrencies. A blockchain is composed of a series of blocks, each containing a batch of transactions that have been cryptographically linked to the preceding block. This chain of blocks is replicated across a network of nodes, providing transparency and resistance to tampering. For accountants, the immutable nature of the blockchain means that transaction data can be independently verified, which aids in audit procedures and the reconstruction of historical balances. However, the sheer volume of data and the need for specialized analytical tools can pose challenges when integrating blockchain records into traditional accounting systems.

A wallet is a software application or hardware device that stores the cryptographic keys necessary to send and receive cryptocurrency. Wallets come in various forms, including hot wallets (connected to the internet) and cold wallets (offline storage). The two essential components of a wallet are the public key and the private key. The public key functions as an address that others use to send funds, while the private key authorizes the spending of those funds. From an accounting perspective, the wallet’s address is analogous to a bank account number, and the private key must be safeguarded with the same diligence as a physical safe‑deposit box, because loss or theft of the private key results in irreversible loss of assets.

Transaction in the cryptocurrency context denotes the transfer of value from one address to another. Each transaction includes details such as the sender’s address, the recipient’s address, the amount transferred, and a timestamp. Transactions are broadcast to the network, validated by miners or validators, and then recorded on the blockchain. For accountants, each transaction generates a record that must be examined for classification (e.g., purchase, sale, exchange, payment for services) and for valuation at the time of the event. The valuation process often requires identifying the market price of the cryptocurrency at the precise moment of the transaction, which can be complicated by the existence of multiple exchanges offering differing rates.

Mining refers to the process by which new blocks are added to the blockchain. In proof‑of‑work (PoW) systems, miners compete to solve a computational puzzle, and the first to succeed appends the block and receives a reward in the form of newly minted cryptocurrency and transaction fees. Mining can be a source of income for individuals and businesses, and therefore it may be treated as trading income for tax purposes. Accountants must recognize the revenue from mining rewards, assess the associated expenses (such as electricity and hardware depreciation), and determine the appropriate accounting treatment under UK GAAP or IFRS.

Proof‑of‑Stake (PoS) is an alternative consensus mechanism where validators are selected to create new blocks based on the amount of cryptocurrency they hold and are willing to “stake” as collateral. Validators earn rewards proportional to their stake, and they can be penalized for malicious behavior. From an accounting standpoint, the staking reward is similar to interest income, but the underlying asset is still a cryptocurrency. The valuation of the staked assets, the recognition of earned rewards, and the accounting for any potential loss of staked funds must be carefully documented to comply with regulatory guidance.

Exchange denotes a platform where users can trade one cryptocurrency for another, or exchange cryptocurrency for fiat currency such as pounds sterling. Exchanges can be centralized (operated by a company that holds custody of user funds) or decentralized (where trades occur directly between users via smart contracts). When a transaction occurs on an exchange, the exchange typically provides a trade confirmation that includes the price, quantity, fees, and timestamps. Accountants should retain these confirmations as primary evidence for the transaction, as they are crucial for calculating gains or losses and for supporting the tax position taken in a tax return.

Stablecoin is a type of cryptocurrency designed to maintain a stable value relative to a reference asset, often a fiat currency like the US dollar or the euro. Stablecoins achieve price stability through mechanisms such as collateralisation, algorithmic supply adjustments, or a combination of both. Because stablecoins are frequently used as a medium of exchange or a store of value within the crypto ecosystem, they can appear in accounting records as cash equivalents, provided that the stability criteria are met. However, the regulatory environment around stablecoins is evolving, and accountants must stay informed about any changes that could affect classification or disclosure requirements.

Smart contract is a self‑executing piece of code that runs on a blockchain and automatically enforces the terms of an agreement when predefined conditions are met. Smart contracts enable complex transactions such as token swaps, decentralized finance (DeFi) lending, and automated royalty payments. For accounting purposes, the execution of a smart contract can give rise to revenue, expense, or asset recognition events. For example, a DeFi lending protocol that generates interest income for a user would require the accountant to record the interest earned as income and to assess the fair value of the underlying token at each reporting date.

Token is a generic term for any digital asset that exists on a blockchain. Tokens can represent a wide range of assets, including utility rights within an application, equity in a venture, or claims on future cash flows. In the UK, the classification of tokens for accounting purposes depends on their substance. Utility tokens that provide access to a service may be treated as intangible assets, whereas security tokens that confer ownership rights may be accounted for under equity or liability standards. The identification of the token’s nature is a critical step in determining the appropriate measurement and disclosure.

Initial Coin Offering (ICO) is a fundraising method where a new cryptocurrency project issues tokens to investors in exchange for established cryptocurrencies such as Bitcoin or Ethereum. ICOs have been largely supplanted by more regulated mechanisms such as Security Token Offerings (STOs) and Initial Exchange Offerings (IEOs). Nevertheless, accountants may still encounter historic ICO transactions that need to be recorded. The initial receipt of tokens is often recognised as an investment, and subsequent changes in the token’s fair value must be evaluated for impairment or revaluation, depending on the chosen accounting policy.

Security Token Offering (STO) represents a regulated alternative to ICOs, wherein tokens are issued that are classified as securities under UK law. STOs typically grant holders rights similar to traditional shares, such as dividends, voting, or profit participation. Because STO tokens are securities, they fall under the existing financial instrument accounting framework (IFRS 9 or UK GAAP FRS 102). This means that the initial measurement, subsequent remeasurement, and disclosure requirements mirror those applied to conventional equity or debt instruments, albeit with consideration of the underlying blockchain technology.

Decentralised Finance (DeFi) describes a suite of financial services that operate on public blockchains without intermediaries. DeFi applications include lending platforms, decentralized exchanges, and yield‑farming protocols. The rapid growth of DeFi has introduced new accounting challenges, such as determining when a transaction constitutes a loan, a derivative, or an investment. For instance, providing liquidity to a decentralized exchange in return for a share of trading fees may be treated as an interest‑bearing deposit, requiring accrual of earned fees as income and the periodic assessment of the liquidity token’s fair value.

Gas fee is the term used for the cost of executing a transaction or running a smart contract on a blockchain that employs a fee‑based model, most notably Ethereum. Gas fees are paid in the native cryptocurrency of the network (e.g., ether) and vary according to network congestion and transaction complexity. From an accounting perspective, gas fees are a transaction cost that should be deducted from the proceeds of the related transaction, thereby reducing the amount of gain or increasing the amount of loss recognised. Accurate tracking of gas fees is essential for precise tax calculations.

Fork denotes a change to the protocol of a blockchain that results in a divergence of the network. A hard fork creates an incompatible version, potentially leading to the existence of a new cryptocurrency, whereas a soft fork maintains compatibility with the original chain. Forks can affect the valuation of holdings, as a holder may receive an allocation of the new cryptocurrency based on the pre‑fork balance. Accountants must determine the appropriate accounting treatment for the resulting assets, which may involve recognizing a new asset at fair value on the date of the fork.

Cold storage refers to the practice of keeping cryptocurrency private keys offline to protect them from cyber‑attacks. Cold storage solutions include hardware wallets, paper wallets, and air‑gapped computers. While cold storage reduces the risk of theft, it introduces operational risk, such as loss due to physical damage or misplacement. In the accounting context, the choice of storage method influences the assessment of internal controls, the classification of assets as “held for trading” versus “held for long‑term investment,” and the disclosure of custody arrangements in the financial statements.

Hot wallet is a software‑based wallet that remains connected to the internet, facilitating quick access to funds for trading or payments. Hot wallets are convenient but expose private keys to potential hacking. Companies that maintain hot wallets must implement robust security policies, including multi‑factor authentication, segregation of duties, and regular reconciliation of on‑chain balances with internal records. The audit trail for hot‑wallet transactions should be documented in detail to support the reliability of financial reporting.

Fiat currency is a legal tender issued by a government that is not backed by a physical commodity. In the United Kingdom, the primary fiat currency is the pound sterling. When cryptocurrency is exchanged for fiat, the transaction must be recorded at the prevailing market rate to determine the amount of cash received. The difference between the cryptocurrency’s cost basis and the cash proceeds yields a capital gain or loss, which must be reported to HMRC. Accurate conversion rates can be obtained from reputable exchange rate sources, and the chosen source should be consistent across reporting periods.

Capital gain arises when a cryptocurrency asset is disposed of for more than its cost basis. The gain is calculated by subtracting the acquisition cost (including any transaction fees) from the proceeds of the disposal (also net of fees). HMRC treats cryptocurrency gains as taxable, subject to the annual exempt amount and the applicable capital gains tax rates. Accountants must maintain detailed records of each acquisition and disposal, ensuring that the cost basis is correctly allocated, especially when multiple purchases of the same token occur at different prices (the “average cost” method may be applied).

Trading income is recognized when cryptocurrency activities are undertaken as part of a trade, such as mining, day‑trading, or providing services for payment in crypto. In such cases, the profit from each transaction is treated as trading income rather than a capital gain. The distinction influences the tax treatment, as trading income is subject to income tax rates and may be offset by allowable business expenses. Determining whether an activity constitutes a trade involves assessing factors such as frequency, intention, organization, and profitability.

Impairment occurs when the recoverable amount of a cryptocurrency asset falls below its carrying amount, indicating that the asset’s value has declined permanently. Impairment testing is required when there is evidence of a decline in market price or when the asset is deemed to be no longer actively traded. If an impairment loss is identified, it must be recognised in the profit and loss statement and the carrying amount of the asset reduced accordingly. Subsequent recoveries of value are generally not reversed under UK accounting standards, meaning the lowered carrying amount remains until the asset is disposed of.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. For cryptocurrency, fair value is typically derived from observable market prices on reputable exchanges. When no active market exists, accountants may need to use valuation techniques such as discounted cash flow models or reference pricing from similar assets. The selection of a consistent valuation methodology is essential for comparability and for meeting disclosure requirements.

Disclosure obligations require entities to provide information in the financial statements that enables users to understand the nature and risks associated with cryptocurrency holdings. Disclosures may include the accounting policies adopted, the valuation methods used, the amount of assets held, the location of custodial arrangements, and any significant risks such as price volatility or regulatory uncertainty. HMRC also expects transparency regarding the calculation of gains and losses, and the supporting documentation must be retained for a minimum of six years.

Regulatory framework in the United Kingdom encompasses guidance from HMRC, the Financial Conduct Authority (FCA), and the International Accounting Standards Board (IASB). HMRC’s “Cryptoassets: taxation” guidance outlines the tax treatment of crypto transactions, while the FCA’s registration requirements cover crypto‑asset businesses that provide services to UK consumers. Accountants must stay abreast of changes in these regulations, as non‑compliance can result in penalties, reputational damage, and the need to restate financial statements.

Audit of cryptocurrency transactions presents unique challenges due to the decentralized nature of the underlying technology. Auditors must verify the existence and ownership of crypto assets, confirm the accuracy of recorded balances, and test the effectiveness of internal controls over private key management. Techniques include requesting a “wallet confirmation” from the client, performing blockchain tracing to reconcile on‑chain transactions with ledger entries, and evaluating the robustness of security procedures surrounding cold and hot storage.

Internal control over cryptocurrency assets involves processes designed to safeguard private keys, ensure accurate recording of transactions, and prevent unauthorized access. Key control activities include segregation of duties (e.g., separate individuals responsible for key generation, transaction approval, and ledger entry), periodic reconciliation of blockchain balances with accounting records, and the implementation of multi‑signature wallets that require multiple approvals for fund transfers. Effective internal control reduces the risk of misstatement and fraud, thereby supporting reliable financial reporting.

Multi‑signature wallet is a security mechanism that requires two or more private keys to authorize a transaction. This arrangement distributes authority among multiple individuals or entities, mitigating the risk that a single compromised key could result in loss of assets. In accounting practice, multi‑signature wallets align with the principle of dual control and can be incorporated into the organization’s governance framework. Documentation of the signatory hierarchy and the process for adding or revoking signatories is essential for auditability.

Tokenisation is the process of representing a real‑world asset, such as property or equity, as a digital token on a blockchain. Tokenisation can enhance liquidity and enable fractional ownership. For accountants, tokenisation raises questions about the classification of the token (whether as an investment, an intangible asset, or a financial instrument) and the measurement of the underlying asset’s fair value. The accounting treatment must reflect the economic substance of the token and comply with the relevant standards for the underlying asset class.

Liquidity describes the ease with which a cryptocurrency can be converted into cash without materially affecting its price. High liquidity is typical of major cryptocurrencies such as Bitcoin and Ether, while smaller tokens may exhibit limited liquidity, leading to price slippage on large trades. Liquidity considerations affect the valuation of crypto assets, as assets with low liquidity may require discounting to reflect the cost of disposal. Accountants should assess market depth and trading volume when determining fair value.

Volatility is a characteristic of cryptocurrency markets, reflecting rapid and substantial price fluctuations over short periods. Volatility impacts both the measurement of gains and losses and the risk assessment disclosed in financial statements. While volatility does not alter the accounting basis, it influences the timing of asset disposals, the likelihood of impairment, and the strategic decisions of management regarding hedging or diversification. Understanding volatility helps accountants provide more informed advice to clients on risk management.

Hedging in the crypto context may involve entering into derivative contracts, such as futures or options, to mitigate exposure to price movements. Hedge accounting requires meeting strict criteria, including documenting the hedging relationship, demonstrating the effectiveness of the hedge, and measuring the hedge instrument at fair value. If the criteria are satisfied, changes in the fair value of the hedging instrument can be recognised in other comprehensive income, reducing earnings volatility. Failure to meet the criteria results in the derivative being accounted for at fair value through profit or loss.

Derivative is a financial instrument whose value derives from an underlying asset, such as a cryptocurrency. Common crypto derivatives include futures contracts, perpetual swaps, and options. Derivatives are often used for speculation, arbitrage, or hedging purposes. In accounting, derivatives are generally measured at fair value, with gains and losses recognised in profit or loss unless hedge accounting is applied. The complexity of crypto derivatives, including the lack of standardized contracts, can increase the difficulty of valuation and disclosure.

Compliance refers to adherence to statutory and regulatory requirements governing cryptocurrency transactions. In the UK, compliance includes meeting anti‑money‑laundering (AML) obligations, reporting taxable events to HMRC, and ensuring that any crypto‑related services are authorised by the FCA where applicable. Accountants play a pivotal role in establishing compliance frameworks, conducting risk assessments, and providing documentation that supports the entity’s regulatory filings.

Anti‑money‑laundering (AML) measures are designed to prevent the use of crypto assets for illicit purposes. AML controls typically involve customer due diligence, transaction monitoring, and reporting suspicious activity. Because blockchain transactions are pseudo‑anonymous, robust AML procedures are essential for entities that handle crypto assets on behalf of clients. Accountants must ensure that AML policies are integrated into the overall internal control environment and that necessary records are retained for the statutory period.

Tax reporting for cryptocurrency involves calculating gains and losses, determining the nature of income (capital vs. trading), and completing the appropriate sections of the Self‑Assessment tax return or corporation tax return. HMRC requires detailed disclosures, including the dates of acquisition and disposal, the quantity of cryptocurrency, the proceeds, the cost basis, and the applicable exchange rates. Accurate tax reporting reduces the risk of penalties and aligns financial reporting with tax compliance.

Corporate governance encompasses the structures and processes by which an organisation directs and controls its activities. When crypto assets form a material part of an entity’s balance sheet, governance bodies must address issues such as board oversight, risk appetite, remuneration policies for crypto‑related performance, and the establishment of a clear strategy for crypto investment. Good governance ensures that decisions regarding acquisition, holding, and disposal of crypto assets are made in the best interest of shareholders and stakeholders.

Financial reporting is the process of preparing and presenting financial statements that provide a true and fair view of an entity’s financial position, performance, and cash flows. The inclusion of cryptocurrency transactions introduces new line items, measurement bases, and disclosures. Entities must decide whether to present crypto assets as intangible assets, inventory, or financial instruments, each of which carries distinct presentation and measurement implications. The chosen classification should reflect the entity’s business model and the nature of the crypto activity.

Intangible asset is a non‑physical resource that provides future economic benefits, such as patents, trademarks, or goodwill. Some cryptocurrencies, particularly those that do not have a readily determinable market price, may be classified as intangible assets under UK accounting standards. Intangible assets are initially measured at cost and subsequently carried at cost less any accumulated impairment losses. The decision to treat a cryptocurrency as an intangible asset should be supported by evidence of the absence of an active market and the expectation of future benefit.

Inventory refers to assets held for sale in the ordinary course of business. Entities that engage in frequent buying and selling of cryptocurrency as part of their trading activities may classify crypto holdings as inventory. Inventory is measured at the lower of cost and net realizable value, and changes in value are recognised as cost of sales. The inventory approach aligns with the treatment of traditional securities held for trading, but it requires diligent tracking of purchase costs and market prices.

Financial instrument is a contract that results in a financial asset for one party and a financial liability or equity instrument for another. Certain crypto tokens, particularly security tokens, meet the definition of a financial instrument and must be accounted for under the relevant standards (IFRS 9 or UK GAAP FRS 102). The classification (e.g., amortised cost, fair value through profit or loss, or fair value through other comprehensive income) dictates the measurement and presentation of the instrument, as well as the associated disclosure requirements.

Revenue recognition governs the timing and amount of revenue that an entity records in its financial statements. When a business receives cryptocurrency as payment for goods or services, revenue is recognised at the fair value of the crypto asset at the point of sale. Subsequent fluctuations in the asset’s value are reflected in gains or losses, not in revenue. Accurate revenue recognition ensures compliance with the accrual basis of accounting and provides a reliable basis for performance measurement.

Expense recognition follows the matching principle, whereby costs incurred to generate revenue are recognised in the same period as the related revenue. In the crypto environment, transaction fees (gas fees) and mining expenses must be matched with the corresponding revenue or asset acquisition. For example, the cost of mining equipment is capitalised and depreciated over its useful life, while the electricity consumed during mining is recognised as an operating expense in the period incurred.

Depreciation is the systematic allocation of the cost of a tangible asset over its useful life. Mining rigs, hardware wallets, and other physical infrastructure used in crypto operations are subject to depreciation. The depreciation method (straight‑line, reducing balance, etc.) should reflect the pattern in which the asset’s economic benefits are consumed. Proper depreciation ensures that the financial statements present a realistic view of the entity’s asset base and expense profile.

Impairment testing is required when there is an indication that an asset’s recoverable amount may be less than its carrying amount. For crypto assets, indicators may include a sustained decline in market price, regulatory actions that restrict trading, or technical issues that affect the blockchain’s functionality. The impairment test involves estimating the asset’s fair value less costs to sell and comparing it to the carrying amount. If the fair value is lower, an impairment loss is recognised.

Revaluation allows an entity to adjust the carrying amount of an asset to reflect its current fair value. Under UK GAAP, revaluation is permitted for certain assets, such as intangible assets, provided that a reliable valuation methodology exists. Revaluation of crypto assets can be complex due to market volatility and the lack of standardized valuation models. If an entity elects to revalue its crypto holdings, the increase in value is recognised in equity as a revaluation surplus, while decreases are recognised in profit or loss.

Audit trail is the chronological record that documents the sequence of activities affecting a particular asset or transaction. In cryptocurrency accounting, the audit trail includes blockchain transaction hashes, wallet addresses, exchange confirmations, and internal ledger entries. Maintaining a complete and reliable audit trail is essential for verifying the existence and ownership of crypto assets, supporting the accuracy of financial statements, and satisfying regulatory scrutiny.

Transaction hash is a unique identifier generated by cryptographic hashing algorithms that represents a specific blockchain transaction. The hash can be used to locate the transaction on a blockchain explorer, providing transparent evidence of the transaction’s details, such as the parties involved, the amount transferred, and the timestamp. Including transaction hashes in accounting documentation enhances the credibility of the records and facilitates audit procedures.

Blockchain explorer is a web‑based tool that allows users to view and search the contents of a blockchain, including blocks, transactions, and addresses. Popular explorers include Etherscan for Ethereum and Blockchain.com for Bitcoin. Accountants can use explorers to verify transaction details, confirm wallet balances, and trace the flow of funds. The data obtained from a blockchain explorer should be captured and stored as part of the supporting documentation for each crypto transaction.

Custodian is a third‑party service provider that holds cryptocurrency assets on behalf of clients, offering secure storage, transaction processing, and reporting services. Engaging a custodian can enhance the security of crypto holdings and provide an additional layer of oversight. However, reliance on a custodian introduces counterparty risk, and accountants must evaluate the custodian’s regulatory status, insurance coverage, and internal controls. The relationship with the custodian should be reflected in the financial statements, disclosing the nature and extent of the assets held.

Insurance for cryptocurrency assets is an emerging field that provides coverage against loss due to theft, hacking, or operational errors. While traditional insurance policies may not cover crypto assets, specialised insurers now offer policies tailored to digital assets. Accounting for insurance involves recognising the premium expense in the period incurred and, if a claim is paid, recording the recovery as other income. The presence of insurance can affect the assessment of risk and the valuation of crypto assets.

Risk management encompasses the identification, assessment, and mitigation of risks associated with cryptocurrency activities. Key risks include market risk (price volatility), operational risk (security breaches), regulatory risk (changing legal requirements), and liquidity risk (difficulty converting assets to cash). A robust risk management framework integrates quantitative measures, such as value‑at‑risk calculations, with qualitative controls, such as governance policies and staff training. Effective risk management supports sound decision‑making and protects the entity’s financial position.

Value‑at‑Risk (VaR) is a statistical technique used to estimate the potential loss in value of a portfolio over a defined period for a given confidence level. Applying VaR to a portfolio of cryptocurrencies can help quantify market risk exposure and inform capital allocation decisions. However, the high volatility and limited historical data for many crypto assets can reduce the reliability of VaR estimates, requiring the use of stress‑testing and scenario analysis as complementary tools.

Stress testing involves evaluating the impact of extreme but plausible events on the value of crypto holdings. Scenarios may include a sudden regulatory ban, a major exchange collapse, or a prolonged market downturn. Stress testing provides insight into the resilience of the entity’s financial position and assists in developing contingency plans. The results of stress tests should be documented and disclosed where material to the financial statements.

Regulatory reporting requires entities to submit information to supervisory bodies, such as the FCA, regarding their crypto activities. Reports may include details of transactions, the identity of counterparties, anti‑money‑laundering controls, and the volume of assets under management. Accurate regulatory reporting reinforces compliance, reduces the likelihood of enforcement action, and demonstrates transparency to stakeholders. Accountants must ensure that the data reported aligns with the data recorded in the financial statements.

Data protection obligations, such as those imposed by the UK General Data Protection Regulation (UK GDPR), apply to personal data collected in the course of crypto transactions. Customer information, wallet addresses linked to identified individuals, and transaction histories may constitute personal data. Entities must implement appropriate technical and organisational measures to protect this data, maintain records of processing activities, and provide data subjects with required rights. Compliance with data protection law is integral to overall governance and risk management.

Blockchain analytics tools help trace the movement of cryptocurrency across addresses, identify patterns of activity, and detect illicit behaviour. These tools can be employed by accountants and auditors to verify the source of funds, assess the legitimacy of counterparties, and support AML investigations. While blockchain analytics can enhance transparency, the interpretation of results requires expertise, as the pseudonymous nature of addresses can lead to false positives. Proper training and professional judgement are essential when using these tools.

Professional standards set by bodies such as the Institute of Chartered Accountants in England and Wales (ICAEW) and the Association of Chartered Certified Accountants (ACCA) provide guidance on ethical conduct, competence, and quality of work. Members are expected to apply professional skepticism, maintain confidentiality, and act in the public interest when dealing with cryptocurrency transactions. Adhering to professional standards ensures that accountants deliver reliable advice and uphold the reputation of the profession.

Continuing professional development (CPD) is vital in the rapidly evolving crypto landscape. Accountants must stay informed about new technologies, emerging regulatory changes, and evolving best practices. CPD activities may include attending industry conferences, completing specialised courses on blockchain accounting, and participating in webinars hosted by regulatory agencies. Ongoing education enables practitioners to provide accurate, up‑to‑date guidance to clients and to navigate the complexities of cryptocurrency accounting with confidence.