Legal Challenges in Blockchain-Based Smart Contract Execution

Abstract

Smart contracts promise automation, transparency, and reduced transaction costs, yet their deployment on distributed ledgers exposes deep legal fault lines that traditional doctrinal tools only partially address. This paper synthesizes contract, property, data-protection, consumer, and financial-regulatory dimensions to map the principal legal challenges that arise when code becomes performance. We distinguish “smart legal contracts” (where code implements an enforceable legal agreement) from purely automated, code-only arrangements, and we explain why, despite technical self-execution, contract law, remedies, and regulatory oversight remain indispensable. We analyze enforceability and interpretation (e.g., the “reasonable coder” question), formation and consent, jurisdiction and choice-of-law in borderless networks, immutability versus legal rectification, oracle risk and attribution of liability, consumer-protection/unfair terms, AML/KYC overlays, evidentiary issues, and property/transfer rules for on-chain assets. Recent instruments—such as the EU Data Act’s essential requirements for smart contracts used in data-sharing, the UK Law Commission’s guidance on smart legal contracts, the UKJT’s Digital Dispute Resolution Rules, UNCITRAL model laws, and the U.S. UCC Article 12 on controllable electronic records—are reshaping the legal terrain but do not eliminate foundational questions. To organize this complexity, we propose a simple Legal Risk Salience Index (LRSI) that scores likelihood and impact for ten recurring risk families; the index is a transparent, replicable rubric for counsel and product teams to prioritize mitigations. We conclude with actionable recommendations—layering natural-language wrappers, robust governance and kill-switch design consistent with statutory requirements, explicit choice-of-law and dispute-resolution clauses (including on-chain arbitration), and defensible oracle strategies—along with scope and limitations of the analysis. The result is a practitioner-oriented map of where code and law still talk past each other—and how to bring them into better alignment.