Smart contract risks: legal pitfalls for businesses using blockchain

Smart contracts are increasingly used by businesses as tools for automating settlements, performance of obligations, and management of digital assets. However, behind their apparent technological neutrality lie significant legal risks that are often underestimated at the implementation stage. Code does not account for context, the parties’ intentions, or exceptional circumstances – elements on which contract law traditionally relies. Mistakes in smart contracts may result in irreversible financial losses, regulatory scrutiny, and complex cross-border disputes. This article examines the key legal risks associated with smart contracts and highlights the pitfalls businesses should consider when using blockchain-based solutions.

What is a smart contract: technical and legal perspective

Before assessing the risks, it is essential to clearly understand what a smart contract represents from both a technological and legal perspective. The gap between these two dimensions is often the primary source of business-critical issues.

Technological definition of a smart contract

From a technical standpoint, a smart contract is software code deployed on a blockchain that automatically executes predefined conditions when specific events occur. It operates without human intervention, relying on decentralised infrastructure and predetermined execution logic.

Key technological features of smart contracts include:

• Automatic execution without additional confirmation by the parties;
• Immutability after deployment on the blockchain;
• Transparency of code and transaction history;
• Reliance on external data sources (oracles) to trigger conditions.

These features make smart contracts highly efficient for automation while simultaneously creating risks that are difficult to manage using traditional legal tools.

Legal nature of smart contracts

From a legal perspective, a smart contract does not always qualify as a “contract” in the classical sense. In many jurisdictions, code alone is not recognised as a legally binding agreement unless the essential elements of contract formation are present, including mutual intent, legal capacity, applicable law, and dispute resolution mechanisms.

Smart contracts are more commonly treated as:

• Technical tools for executing agreed obligations;
• Components of a broader contractual framework;
• Automation mechanisms rather than standalone legal agreements.

Problems arise when businesses rely solely on code without properly documenting key terms off-chain. In such cases, enforcing the parties’ rights becomes particularly challenging.

Why smart contracts are attractive to businesses

Despite legal complexities, companies increasingly adopt smart contracts in finance, logistics, asset management, and corporate structures. The primary driver is economic and operational efficiency.

For businesses, smart contracts are attractive due to:

• Reduced transaction and administrative costs;
• Faster settlements and performance of obligations;
• Minimised human involvement;
• Scalability in cross-border projects.

However, corporate use of smart contracts requires a cautious approach: the higher the transaction value and regulatory exposure, the more critical the legal risks embedded in the code become.

Legal risks of code irreversibility

One of the defining features of smart contracts is their immutability after deployment on a blockchain. From a technical perspective, this ensures predictability and protection against unauthorised changes. From a legal standpoint, however, it creates a range of risks that are particularly critical for businesses operating in regulated and cross-border environments.

Immutability as a source of legal issues

Once a smart contract is deployed, its code generally cannot be modified or “fixed” without deploying a new contract. This means that any errors in logic, calculations, or execution conditions remain in place for the entire lifecycle of the contract.

In corporate practice, this directly conflicts with fundamental principles of contract law, which typically allow for:

• Amendment of terms by mutual agreement;
• Correction of errors and inaccuracies;
• Adaptation of the contract to changed circumstances.

With smart contracts, such mechanisms are either unavailable or require complex technical and legal solutions that must be designed in advance.

Irreversible execution and lack of effective remedies

Smart contracts execute automatically and, in most cases, irreversibly. Once the coded conditions are met, the transaction is carried out regardless of whether the outcome reflects the parties’ actual intent or the commercial rationale of the transaction.

From a legal perspective, this creates a lack of effective remedies.섭 Traditional protective tools—such as suspension of performance, injunctive relief, or restitution—often prove ineffective because:

• Execution occurs instantly;
• Assets may be transferred into a decentralised environment;
• There is no central authority capable of reversing the transaction.

As a result, even clearly erroneous or unfair execution can be extremely difficult to challenge in practice.

Case law and business risks

Several high-profile blockchain cases have shown that courts are not always willing to intervene in the consequences of smart contract execution, particularly where the parties voluntarily relied on automated mechanisms. At the same time, the “code is law” argument has no universal legal recognition and is treated with caution by courts.

For businesses, this translates into heightened risk: a coding error may lead to financial losses that cannot be recovered even with a favourable court decision. For this reason, smart contract immutability should be viewed not as a standalone advantage, but as a factor requiring additional contractual safeguards and off-chain protection mechanisms.

Challenges in interpreting and enforcing smart contracts

Even when technically sound, a smart contract remains legally vulnerable if there is a mismatch between the code and the parties’ intentions. For businesses, this is one of the most complex risks, as it typically materialises only after a product is launched or a transaction is concluded.

Conflict between code and the parties’ agreement

A smart contract executes exactly what is encoded, regardless of context, commercial logic, or the parties’ expectations. Unlike traditional contracts, code is not “interpreted” – it simply runs. If terms are drafted imprecisely or implemented with errors, the execution outcome may significantly diverge from the agreed intent.

From a legal perspective, this creates an evidentiary challenge: parties must explain to a court or arbitral tribunal why the automated outcome does not reflect the actual agreement, even if the code was formally accepted by both sides.

Limits of legal interpretation of code

Courts and arbitral tribunals typically rely on contractual wording, correspondence, and the parties’ conduct. Smart contract code does not always fit within this framework. In many jurisdictions, there is no established practice of interpreting program code as legal text, particularly when written in specialised languages such as Solidity.

This leads to legal uncertainty: some courts treat code as a technical tool, while others view it as part of the contractual arrangement. In cross-border projects, such divergence significantly increases enforceability risks.

The role of off-chain documentation

Most legal risks associated with smart contracts are mitigated through complementary off-chain documentation. It records the parties’ intentions, applicable law, dispute resolution mechanisms, and the consequences of execution errors.

Such documentation is typically used to:

• Define legally binding terms of the transaction;
• Describe the role of the smart contract as an execution tool;
• Allocate responsibility for coding errors and failures;
• Establish dispute resolution and compensation mechanisms.

Without a clear link between code and traditional agreements, businesses are left with limited legal protection, even if the smart contract operates without technical faults.

Regulatory and compliance pitfalls

Using smart contracts does not exempt businesses from regulatory obligations. On the contrary, automation and decentralisation often complicate compliance, particularly in regulated industries and cross-border projects.

AML, KYC and transaction transparency

Smart contracts can execute transactions automatically, but they do not, by themselves, ensure party identification or source-of-funds controls. This creates AML/KYC compliance risks if such checks are not embedded into the overall product architecture.

Regulators assess the actual operating model, not the technology. If smart contracts are used in financial activities without adequate due diligence procedures, liability rests with the operator or the company implementing the solution.

Data protection and personal data

A separate risk arises from processing personal data. Recording information on a blockchain may conflict with data protection principles, including erasure and storage limitation requirements. Even hashed or indirectly identifiable data may fall within regulatory scope depending on context.

For businesses, this means carefully assessing which data interacts with smart contracts and keeping sensitive information off immutable ledgers.

Financial and product regulation

In some cases, smart contracts may be classified as part of a financial product, investment instrument, or payment infrastructure. Such classification triggers additional licensing and reporting obligations that are often overlooked at the design stage.

Ignoring these aspects may lead to regulatory action after launch, when adjusting the model becomes significantly more costly.

Operational risks: dependence on infrastructure and external factors

Beyond legal and regulatory aspects, smart contracts create operational risks that directly affect business stability. These risks are often underestimated because they are not formally linked to contract law, yet in practice they frequently cause failures and disputes.

Dependence on blockchain infrastructure and gas fees

The execution of smart contracts depends on network conditions, including blockchain congestion, transaction costs, and technical stability. During peak periods, transactions may be delayed or become economically unviable due to increased gas fees.

For businesses, this results in reduced predictability of performance, particularly in time-sensitive operations where delays may have financial consequences.

Risks related to oracles and external data

Most smart contracts do not operate in isolation and rely on external data sources (oracles). Errors, manipulation, or service outages directly affect contract execution, even if the code itself is correct.

The legal issue is that responsibility for inaccurate oracle data is often unclear and rarely addressed explicitly in documentation.

Integration with legacy systems

In corporate environments, smart contracts are frequently integrated with traditional IT systems, payment infrastructure, and internal processes. Any mismatch between on-chain and off-chain logic may result in execution errors and accounting discrepancies. Without a well-structured operating model, such failures become not only technical but also legal issues.

Practical recommendations for mitigating the risks of smart contracts

Most legal risks associated with smart contracts can be significantly reduced if code is treated not as a standalone agreement, but as part of a broader legal and operational framework. For businesses, the key is not abandoning the technology, but implementing appropriate safeguards.

Code audits and technical verification

Independent code audits remain a core risk management tool. They help identify vulnerabilities before deployment and reduce the likelihood of irreversible errors.

In practice, it is recommended to:

• Conduct external security audits prior to launch;
• Use formal verification for critical functions;
• Perform audits with each material code update.

Off-chain contractual framework

Smart contracts should be linked to traditional legal documentation that records the parties’ intentions and allocates responsibility. Off-chain agreements enable courts and arbitral tribunals to interpret the parties’ relationship.

Such a framework typically includes:

• A master agreement or framework agreement;
• A description of the smart contract’s role as an execution tool;
• Provisions on governing law, jurisdiction, and remedies.

Flexibility mechanisms and risk transfer

For corporate projects, it is important to build in elements of control from the outset. This may include emergency stop functions, multi-signature mechanisms, or insurance solutions to cover losses arising from bugs and failures. These measures do not eliminate risks entirely, but make them more predictable and legally manageable.

Key legal checkpoints for businesses using smart contracts

Before deploying or using smart contracts in business processes, make sure that:

• Governing law and dispute resolution forum (court/arbitration) are defined;
• There is an off-chain agreement or framework describing the role of the smart contract and key deal terms;
• Remedies are specified for bugs, incorrect execution, oracle failures, and force majeure;
• Liability allocation between the parties is clearly set out (including developers/providers, where applicable);
• An independent code audit has been conducted and a retesting process is предусмотрен for updates;
• Appropriate control mechanisms are built in (e.g., pause/emergency stop, multi-sig, upgrade procedures, where permitted);
• Regulatory risks (AML/KYC, data protection, financial regulation) are assessed for target jurisdictions;
• Procedures for managing external dependencies (oracles, third-party services, infrastructure) are defined;
• Accurate disclosures and internal policies are in place where the product interacts with customers or users.

How Key2Law can help businesses manage the risks of smart contracts

Key2Law team supports businesses working with smart contracts at every stage: from initial model and transaction structuring to dispute readiness and cross-border project support. We focus on building legally enforceable and regulatorily robust solutions, rather than relying on the formal use of blockchain technology.

Our team provides comprehensive business support by:

• Assessing smart contract models from a corporate, regulatory, and contractual law perspective;
• Structuring off-chain contractual frameworks to complement on-chain execution;
• Identifying and mitigating risks related to code immutability, implementation errors, and external dependencies;
• Analysing regulatory obligations, including financial regulation, data protection, and compliance;
• Designing dispute resolution mechanisms tailored to blockchain-based transactions;
• Preparing projects for audits, due diligence, and investment transactions;
• Supporting cross-border operations involving multiple jurisdictions and legal regimes.

Well-structured use of smart contracts allows businesses to benefit from automation without sacrificing legal certainty. Key2Law helps turn smart contract risks into a manageable part of your legal strategy. Contact our team to discuss how we can support your project.