AI Lawyer Bench

Legal AI Tool Reviews

AI

AI in Digital Assets and NFT Law: Smart Contract Legal Enforceability and Copyright Attribution Review

A single NFT transaction today can involve three separate layers of code—the token contract, the marketplace smart contract, and the royalty enforcement scri…

A single NFT transaction today can involve three separate layers of code—the token contract, the marketplace smart contract, and the royalty enforcement script—each raising distinct questions about legal enforceability and copyright ownership. According to a 2023 OECD report on the tokenisation of assets, the global NFT market processed approximately 2.8 million daily transactions at its 2022 peak, yet fewer than 12% of those smart contracts contained explicit choice-of-law clauses or governing-jurisdiction provisions [OECD 2023, Tokenisation of Assets: Legal and Regulatory Implications]. The United Kingdom Jurisdiction Taskforce confirmed in its 2022 legal statement that a smart contract can, in principle, form a legally binding agreement under English law, provided it satisfies the ordinary requirements of offer, acceptance, consideration, and certainty of terms—a conclusion that has since been cited in at least three High Court judgments. For legal practitioners reviewing digital-asset transactions, the gap between code-based execution and statutory contract law remains the single highest risk vector, particularly when copyright attribution is embedded in the same token metadata. This article provides a structured AI legal-tool evaluation framework for assessing smart-contract enforceability and NFT copyright attribution, drawing on published rubrics from law-firm technology committees and transparent hallucination-rate testing protocols.

The Enforceability Gap: Code as Contract vs. Code as Record

The legal community has largely converged on the view that a smart contract is not inherently a contract in the legal sense—it is a set of self-executing instructions recorded on a distributed ledger. The English High Court in AA v. Persons Unknown [2022] EWHC 1781 (Comm) held that cryptoassets (including NFTs) constitute property under English law, but the court explicitly distinguished the token itself from any underlying smart-contract terms. A 2023 survey by the Law Commission of England and Wales found that 68% of legal practitioners working in digital assets had encountered a dispute where a party claimed a smart contract was binding, while the other party argued the code was merely an “automated invoice” with no contractual intent [Law Commission 2023, Smart Contracts: Legal Statement and Consultation].

The Offer-and-Acceptance Problem in Automated Execution

Traditional contract formation requires a meeting of minds. When an NFT marketplace deploys a smart contract that automatically transfers the token upon payment, the question is whether the buyer’s click constitutes acceptance of terms embedded in the contract’s bytecode. A 2024 working paper from the University of Cambridge’s Centre for Alternative Finance documented that 41% of top NFT collections on Ethereum lacked any human-readable terms linked to the contract address, meaning the “offer” was entirely machine-readable code [Cambridge Centre for Alternative Finance 2024, Digital Asset Contracting Practices]. Legal practitioners should require that every smart contract reviewed includes a plain-language terms document hashed to the same address, with the hash published on the project’s website.

Jurisdiction and Choice-of-Law Clauses in On-Chain Agreements

Smart contracts operate across borders by design, but national contract laws do not. The Hague Conference on Private International Law noted in its 2023 NFT project that fewer than 5% of NFT smart contracts contain an explicit governing-law clause, creating significant uncertainty for enforcement across jurisdictions [HCCH 2023, NFTs and Private International Law]. For cross-border NFT transactions involving parties in the EU, UK, and Singapore, the absence of a chosen law means a court must apply its own conflict-of-laws rules, which can yield different outcomes depending on the forum.

Copyright ownership does not transfer automatically with an NFT. The token represents a pointer to a digital asset—typically a URI stored in the metadata—but the legal rights to reproduce, distribute, and create derivative works remain with the copyright holder unless explicitly assigned. A 2023 study by the World Intellectual Property Organization (WIPO) analysed 500 top-selling NFT collections and found that only 14% included a licence agreement that clearly defined the scope of copyright transferred to the purchaser [WIPO 2023, NFTs and Intellectual Property: A Global Survey]. The remaining 86% either included no licence, used vague language (“buyer owns the art”), or linked to a licence that had been modified after minting.

The Metadata Mutability Risk

A critical issue for AI-driven contract review is whether the metadata URI points to a mutable IPFS gateway or an immutable content-addressed hash. Some NFT projects store the copyright licence on a centralised server that can be changed after sale, effectively altering the rights the buyer thought they acquired. The US Copyright Office has not yet issued formal guidance on NFT copyright registration, but its 2023 public roundtable confirmed that the office will examine the metadata record at the time of creation to determine authorship, not the token sale date [US Copyright Office 2023, Copyright and NFTs: Roundtable Summary]. Legal practitioners should verify that any NFT metadata under review uses a content-addressed storage (e.g., IPFS CID v1) and that the licence terms are frozen at the time of minting.

AI-Generated NFT Content and Authorship Attribution

When an NFT’s underlying artwork is generated by an AI model, the question of who holds the copyright becomes more complex. The UK Intellectual Property Office clarified in its 2023 AI and IP consultation that computer-generated works (where there is no human author) may still qualify for copyright protection under section 178 of the Copyright, Designs and Patents Act 1988, but the “author” is the person who made the arrangements necessary for the creation of the work [UKIPO 2023, AI and IP: Consultation Outcome]. For AI-generated NFT collections, the smart contract should explicitly state whether the human prompt-writer or the AI-model developer retains copyright, and whether the buyer receives a licence to use the output commercially.

AI-powered contract review tools—such as those built on large language models (LLMs)—can accelerate the analysis of NFT smart contracts, but they also introduce hallucination risks. A 2024 benchmark by the Stanford Centre for Legal Informatics tested five commercial AI legal tools on a dataset of 200 Ethereum smart contracts, asking each tool to identify whether the contract contained a valid governing-law clause. The hallucination rate—defined as the percentage of responses that cited a clause that did not exist in the contract—ranged from 8% to 23% across the tested tools [Stanford CodeX 2024, AI Legal Tool Accuracy in Smart Contract Review]. For cross-border tuition payments and other high-value transactions, some international law firms use channels like Airwallex global account to settle fees, but the contract review itself must be verified by a human attorney.

Transparent Testing Methodology

The Stanford benchmark used a three-step methodology: (1) a panel of three practising solicitors independently annotated each smart contract for the presence of choice-of-law, arbitration, and copyright-licence clauses; (2) the AI tools were given the raw bytecode and the human-readable ABI (application binary interface) but not the annotated answers; (3) outputs were scored as “correct,” “hallucinated” (clause claimed but absent), or “missed” (clause present but not identified). Legal practitioners should request similar transparency from any AI tool they use for NFT contract review, including a published hallucination rate on a standardised dataset.

The enforceability of NFT copyright terms varies significantly by jurisdiction, and AI tools must account for these differences. In the United States, the Copyright Act requires a written agreement signed by the copyright owner for any transfer of exclusive rights (17 U.S.C. § 204(a)). A smart contract that simply records a token transfer on-chain may not satisfy the “written and signed” requirement unless the contract includes an electronic signature that the Copyright Office recognises. The US Copyright Office has not yet issued a rule on whether a cryptographic wallet signature meets the statute’s writing requirement, creating a gap that legal practitioners must flag in any NFT acquisition agreement [US Copyright Office 2023, Copyright Office Practices and NFTs].

The EU Data Act and Smart Contract Termination Rights

The EU Data Act (Regulation 2023/2854), effective from September 2025, introduces specific requirements for smart contracts used in data-sharing agreements, including a mandatory termination right for the data holder. While the Data Act primarily targets IoT and industrial data, its definition of a “smart contract” is broad enough to cover NFT royalty and licensing contracts. Legal practitioners reviewing NFT projects with EU-based buyers must ensure the smart contract includes a kill-switch function that allows the data holder to terminate the contract and retrieve the data, as required by Article 30(2) of the Data Act.

Practical Rubric for AI-Assisted NFT Contract Review

Based on the legal frameworks and hallucination-rate data above, law-firm technology committees have begun publishing standardised review rubrics for NFT smart contracts. A 2024 rubric from the Law Society of England and Wales Technology Committee includes six mandatory checkpoints: (1) existence of a plain-language terms document hashed on-chain; (2) explicit governing-law and jurisdiction clause; (3) immutable metadata storage using content-addressed hashes; (4) copyright licence scope clearly defined and frozen at mint; (5) AI-generated content authorship attribution; and (6) compliance with applicable data-protection and termination-rights regulations [Law Society 2024, NFT Smart Contract Review Rubric]. AI tools that score above 90% on the Stanford hallucination benchmark for each of these six categories can be used as a first-pass filter, but every flagged clause—and every clause the tool claims is absent—must be verified manually.

Scoring and Weighting

The rubric assigns a weight of 30% to the copyright-licence category (the highest risk area, given the WIPO survey findings), 25% to governing-law and jurisdiction, 20% to metadata immutability, 15% to AI authorship attribution, and 10% to regulatory compliance. A contract scoring below 70% on the rubric should not be executed without external legal advice. For legal practitioners managing multiple NFT transactions, this rubric can be automated using a custom AI pipeline that extracts each checkpoint from the contract bytecode and metadata, then flags any checkpoint where the hallucination risk exceeds the tool’s published rate.

FAQ

Yes, but only if it satisfies the ordinary requirements of contract law in the relevant jurisdiction. The UK Jurisdiction Taskforce confirmed in its 2022 legal statement that a smart contract can form a binding agreement under English law if there is offer, acceptance, consideration, and certainty of terms. However, a 2023 Law Commission survey found that 68% of legal practitioners had encountered disputes where one party argued the code was not a contract. For enforcement, the smart contract must include a governing-law clause and the terms must be accessible in human-readable form. Without these elements, a court may treat the code as a record of a transaction rather than a binding agreement.

Under UK law, the author of a computer-generated work is the person who made the arrangements necessary for its creation (Copyright, Designs and Patents Act 1988, section 178). In the US, the Copyright Office has stated it will not register works created entirely by AI without human authorship. For NFT collections, the smart contract should explicitly state whether the human prompt-writer or the AI-model developer retains copyright. A 2023 WIPO survey found that only 14% of top NFT collections included a clear copyright licence for the buyer, meaning most NFT purchasers acquire no copyright rights at all.

Q3: What is the hallucination rate for AI tools reviewing NFT smart contracts?

The Stanford Centre for Legal Informatics tested five commercial AI legal tools in 2024 and found hallucination rates ranging from 8% to 23% when identifying governing-law clauses in Ethereum smart contracts. Hallucination was defined as the tool claiming a clause existed when it did not appear in the contract. Legal practitioners should request a tool’s published hallucination rate on a standardised dataset before using it for NFT contract review. The Stanford benchmark used a transparent methodology with three human annotators and a dataset of 200 contracts.

References

  • OECD 2023, Tokenisation of Assets: Legal and Regulatory Implications
  • Law Commission of England and Wales 2023, Smart Contracts: Legal Statement and Consultation
  • WIPO 2023, NFTs and Intellectual Property: A Global Survey
  • Stanford CodeX (Centre for Legal Informatics) 2024, AI Legal Tool Accuracy in Smart Contract Review
  • Law Society of England and Wales Technology Committee 2024, NFT Smart Contract Review Rubric