The Place of Smart Contracts in European Law: Between Technological Neutrality and the Imperative of Responsibility

Smart contracts have become emblematic of blockchain innovation, yet their automated and often irreversible execution challenges the foundations of European private law. This article explores how EU law attempts to remain technologically neutral while increasingly recognising that smart contracts require specific accountability frameworks that cannot be reduced to traditional contracting doctrines.

Introduction

Smart contracts have emerged as one of the most emblematic legal and technological innovations of the blockchain era. Far from being mere lines of code, they function as automated execution mechanisms capable of enforcing obligations without human intervention. Their diffusion across decentralised finance (DeFi), supply-chain traceability, insurance automation, identity management and numerous commercial applications has prompted European legislators and scholars to engage with a fundamental question: how should European law position smart contracts within its normative architecture?

The difficulty stems from an inherent tension. On the one hand, the European Union has long embraced the principle of technological neutrality. This principle demands that the law should regulate functions rather than technologies, and should avoid endorsing or discriminating against any particular innovation. On the other hand, smart contracts introduce new risks that traditional doctrines of liability, enforceability and consumer protection struggle to accommodate. Their autonomy, irreversibility and resistance to ex post modification challenge the foundational assumptions of European private law, whose institutions were designed for human-driven legal acts, amendable contracts and discretionary decision-making.

This article examines the place of smart contracts within European law by analysing the coexistence — and the friction — between technological neutrality and the growing demand for accountability. It argues that smart contracts occupy an ambiguous conceptual status: the law strives to remain technologically neutral, yet cannot ignore the structural characteristics that differentiate automated execution from traditional contracting. The resulting framework reveals a legal landscape in transition, wherein smart contracts are simultaneously normalised as tools of digital commerce and problematised as potential vectors of risk.

I. The Commitment to Technological Neutrality and Its Limits

The European Union has explicitly adopted technological neutrality as a guiding principle in digital regulation. The GDPR, the eIDAS Regulation, the Digital Services Act and the Digital Markets Act all reflect an aversion to technology-specific prescriptions. Instead, they seek to regulate behaviour, outcomes and societal impacts regardless of the underlying infrastructure. This neutrality aims to preserve innovation, avoid premature obsolescence of norms and prevent regulatory capture by dominant technologies.

Smart contracts initially benefited from this paradigm. European legislative texts have avoided defining them in prescriptive terms, preferring functional descriptions such as “computer programs that execute predefined steps” or “automated execution mechanisms.” In theory, smart contracts are treated as an emerging means of performing contractual obligations, no different — in principle — from email exchanges, electronic signatures or digital platforms.

Yet technological neutrality encounters its limits when a technology does not merely perform an existing function more efficiently but structurally reshapes the contours of legal relationships. Smart contracts do not only execute clauses; they execute them automatically, immutably and often without discretionary oversight. This characteristic distinguishes them fundamentally from digitalised contracts, which remain subject to alteration, negotiation and human agency even when concluded electronically. The irreversibility encoded in many smart contracts challenges European legal traditions grounded in consensualism, good faith and the possibility of renegotiation or judicial intervention.

Technological neutrality thus becomes strained. The law cannot regulate smart contracts solely by analogy to traditional contracts without acknowledging the unique properties that may undermine established doctrines. European law finds itself compelled to integrate these technical specificities into its normative analysis, even at the cost of deviating from strict neutrality.

II. Smart Contracts and the Transformation of Contractual Autonomy

One of the most significant doctrinal challenges posed by smart contracts concerns the very nature of contractual autonomy. European private law traditionally rests on the idea that parties express a will capable of forming, modifying or extinguishing obligations. Even in complex commercial contracts, human intention remains the genesis of legal effects.

Smart contracts invert this logic. They shift the centre of gravity from will to code. The parties’ intention becomes front-loaded: all contingencies must be anticipated ex ante, since ex post alteration may be impossible or impracticable once the code is deployed on a blockchain. This rigidity raises doubts about traditional doctrines such as mistake, fraud, unfair terms or hardship (imprévision). If the code executes despite a supervening event that would normally allow renegotiation, how should the law respond? Is the automated execution itself a breach of European principles of good faith? Or does the immutable code represent the parties’ definitive intention, regardless of evolving circumstances?

European legislators have so far avoided answering these doctrinal questions directly. Instead, they rely on technological neutrality to assert that smart contracts are simply another means of expressing consent. But this neutrality hides a structural mismatch. A contractual mechanism that cannot be interrupted or modified without consensus from all participants — or without forking an entire blockchain — does not fit neatly within a legal tradition that relies on judicial interventions, equitable adjustments and flexible remedies.

In practice, European courts will inevitably confront situations where automated execution contradicts fundamental principles of contract law. The tension between autonomy and self-execution thus reveals the inadequacy of a regulatory framework that treats smart contracts as mere extensions of digital contracting.

III. Responsibility and Liability: The Unavoidable Friction

If technological neutrality provides the initial lens for assessing smart contracts, responsibility constitutes the countervailing force. European law cannot accept a contracting environment in which harm occurs without accountability. The autonomy of smart contracts creates a risk that harm may be disconnected from identifiable human actors. This risk manifests in various situations: faulty coding, exploitative design, unintended interactions between smart contracts and vulnerabilities exploited by external actors.

The question of responsibility raises several challenges. First, who is the accountable subject? The developer who wrote the code, the deployer who uploaded it, the platform facilitating its use or the users who interact with it? European liability regimes traditionally assume identifiable wrongdoing or fault. But smart contracts distribute agency across multiple roles and sometimes across anonymous or pseudonymous participants.

Second, can responsibility be meaningfully attributed in a decentralised ecosystem? If a smart contract operates autonomously within a decentralised protocol governed by a DAO, assigning liability becomes conceptually complex. The EU’s civil law systems rely on attribution of conduct to persons or legal entities. Smart contracts challenge this foundational premise by creating environments in which no central authority exerts control.

Third, European consumer protection law complicates matters further. If smart contracts are used for automated consumer transactions, the imbalance of power may be exacerbated. Consumers seldom understand the technical implications of immutable execution. The absence of human discretion may also undermine mechanisms designed to protect vulnerable parties, such as withdrawal rights or the ability to contest abusive terms.

Responsibility therefore becomes a point where technological neutrality collapses. European law cannot remain neutral when the absence of intervention mechanisms could expose parties to uncompensated harm. This tension explains the emerging movement in EU legislative drafts — for instance in data and AI frameworks — toward recognising that automated systems require tailored accountability regimes.

IV. Smart Contracts Within the Broader European Digital Architecture

European law is gradually weaving smart contracts into its broader digital governance framework. Although not addressed directly by MiCA except in relation to crypto-asset operations, smart contracts appear in legislative contexts such as data-sharing (Data Act), eIDAS 2.0 and discussions surrounding AI liability. These instruments demonstrate the EU’s tendency to integrate smart contracts within existing categories rather than developing a standalone regime.

The Data Act, for instance, provides the first quasi-definition of smart contracts at EU level, framing them as mechanisms capable of executing data-sharing agreements. It also imposes obligations regarding secure termination mechanisms, auditability and resilience. This indicates a departure from strict technological neutrality: the law acknowledges that smart contracts require specific safeguards unavailable in traditional digital agreements.

Similarly, the revision of eIDAS contemplates the authentication of smart contracts within trusted service frameworks. This suggests an emerging legal vision in which smart contracts become part of a formalised digital infrastructure, capable of supporting legally recognised transactions.

Yet these developments also reveal the limits of the current approach. By integrating smart contracts into disparate regulatory frameworks without articulating a unified doctrinal foundation, European law risks creating inconsistencies. A fragmented approach undermines the coherence necessary for cross-border enforceability and legal certainty, especially in decentralised systems operating beyond national boundaries.

Conclusion

Smart contracts occupy an ambiguous and evolving position within European law. The principle of technological neutrality has encouraged an initial legal approach that refrains from defining, classifying or prescribing technological specificities. Yet the transformative nature of smart contracts — their automation, irreversibility and capacity to operate without human oversight — triggers demands for accountability that cannot be addressed through neutrality alone.

European law is thus caught between two imperatives. The first is the desire to foster innovation by avoiding premature technological prescriptions. The second is the necessity of preserving the foundational principles of European private law, including responsibility, fairness and the ability to remedy harm. Smart contracts challenge these principles in ways that compel legal adaptation.

As the EU continues to integrate smart contracts into its broader digital governance architecture, the question will not be whether technological neutrality should be abandoned, but how far it can be stretched before it loses coherence. The growing emphasis on responsibility suggests that the future of smart contracts in European law will be shaped less by neutrality and more by a progressive recognition of their structural specificities. European law is moving toward an understanding of smart contracts that acknowledges both their innovative potential and their risks, seeking a balance between automated execution and human accountability. In this sense, smart contracts serve as a revealing test case for the capacity of European law to adapt to technologies that reshape, rather than merely digitise, legal relations.

Key takeaway. Smart contracts expose the limits of technological neutrality in European law: while initially treated as a mere variant of digital contracting, their automated and decentralised nature forces the EU to develop new responsibility frameworks capable of reconciling innovation with accountability.