Critical ReviewInterdisciplinary

Blockchain for AI Auditing: Can Distributed Ledgers Make Algorithms Accountable?

AI systems increasingly make high-stakes decisions, but auditing their fairness remains technically and institutionally difficult. Blockchain technology offers a potential solution: immutable records of model training, data provenance, and decision logs that enable verifiable accountability.

By Sean K.S. Shin
This blog summarizes research trends based on published paper abstracts. Specific numbers or findings may contain inaccuracies. For scholarly rigor, always consult the original papers cited in each post.

When an AI system denies a loan application, rejects a job candidate, or flags a person as a security risk, the affected individual typically has no way to verify that the decision was fair. The model is a black box; the training data is proprietary; the decision logic is opaque. Current accountability mechanismsโ€”ethics review boards, regulatory audits, fairness certificationsโ€”operate on trust: the deploying organization asserts that its system is fair, and the public is expected to believe it.

Blockchain technology offers a different approach: instead of trusting the organization's assertion, the public could verify the system's provenance, training history, and decision patterns through an immutable, publicly auditable record. The question is whether this is technically feasible, economically practical, and institutionally adoptable.

The Research Landscape

The State of Algorithm Auditing

Funda (2025), with 1 citation, provides a systematic review of algorithm auditing processes for assessing bias and risks in AI systems. The review identifies a growing but fragmented field where auditing methods vary widely in scope, methodology, and rigor.

Current auditing approaches fall into three categories:

  • Internal audits: Conducted by the deploying organization. Most common but least independentโ€”the auditor has conflicts of interest.
  • External audits: Conducted by independent third parties (consultancies, academic researchers). More credible but expensive and often limited by access to proprietary systems.
  • Regulatory audits: Mandated by law (as in the EU AI Act). Most authoritative but slowest to implement and constrained by regulatory expertise.
The review finds that all three approaches share a common weakness: audits are snapshots. They evaluate a system at a point in time, but AI systems change continuously as they are retrained, updated, and adapted. A system that passes an audit today may behave differently tomorrow after retraining on new data. Continuous monitoringโ€”rather than periodic auditingโ€”is needed, but the infrastructure for continuous AI monitoring does not yet exist at scale.

Counterfactual Auditing

Pasupuleti (2025), with 1 citation, proposes a specific auditing methodology: counterfactual explanations. The approach works by asking: "What would need to change about this input for the model to produce a different output?" If a loan application was rejected, the counterfactual explanation might be: "If the applicant's income were $5,000 higher, the application would have been approved."

Counterfactual explanations are useful for auditing because they reveal the decision boundary of the modelโ€”the specific factors that tip decisions one way or another. If counterfactual analysis reveals that the factor most likely to change a decision is the applicant's zip code (a proxy for race in many US cities), this constitutes evidence of potential discrimination.

The method has limitations: it can detect disparate treatment (different factors matter for different groups) but is less effective at detecting disparate impact (the same factors produce systematically different outcomes across groups). And it requires access to the modelโ€”something that external auditors may not have.

Blockchain for Model Provenance

Pegwar and Siddiqui (2025) propose integrating blockchain technology with AI systems to create tamper-proof records of model development and deployment. Their architecture records:

  • Training data provenance: What data was used, where it came from, and how it was preprocessed.
  • Model versioning: Every model update is recorded with a cryptographic hash, creating an immutable version history.
  • Decision logs: Selected decisions (or aggregated statistics) are recorded on-chain, enabling retroactive auditing.
  • Fairness metrics: Periodic fairness evaluations are recorded, creating a longitudinal record of the system's bias profile.
The blockchain provides three properties that traditional audit records lack: immutability (records cannot be altered after the fact), transparency (records are publicly verifiable), and decentralization (no single party controls the audit record).

Data Provenance Architecture

Jain (2024) provides a more detailed technical architecture for blockchain-powered data provenance in AI model audits. The system tracks the complete lineage of training dataโ€”from collection to preprocessing to training to deploymentโ€”recording each transformation on a blockchain. This enables auditors to answer questions that are currently unanswerable: "Was this model trained on data collected with informed consent? Were biased data sources excluded? Were preprocessing steps applied consistently?"

Critical Analysis: Claims and Evidence

<
ClaimEvidenceVerdict
Current AI auditing is fragmented and insufficientFunda's systematic reviewโœ… Supported โ€” snapshot-based auditing misses continuous model changes
Counterfactual explanations can detect discriminatory decision boundariesPasupuleti's methodology and experimentsโœ… Supported โ€” for disparate treatment; less effective for disparate impact
Blockchain can provide immutable, verifiable AI audit recordsPegwar & Siddiqui's architecture designโš ๏ธ Uncertain โ€” technically feasible; scalability and adoption untested
Full data provenance tracking is practical for AI systemsJain's architecture proposalโš ๏ธ Uncertain โ€” storage costs and privacy implications need resolution

Open Questions

  • Privacy vs. transparency: Recording model decisions on a public blockchain raises privacy concerns. How do you make audit records verifiable without exposing individual decision subjects?
  • Scalability: Large AI systems make millions of decisions daily. Recording all of them on a blockchain is impractical with current technology. What level of sampling or aggregation is sufficient for meaningful auditing?
  • Institutional adoption: Who mandates blockchain-based auditing? Without regulatory requirements, organizations have little incentive to make their AI systems more transparent.
  • Gaming the system: If organizations know which fairness metrics are being recorded on-chain, they may optimize for those metrics while neglecting othersโ€”a form of Goodhart's Law.
  • What This Means for Your Research

    For AI governance researchers, the gap between snapshot auditing and continuous monitoring is the most pressing practical problem. Blockchain architectures offer a potential infrastructure, but institutional and regulatory frameworks must evolve to mandate their use.

    For blockchain developers, AI auditing is a compelling use case that leverages blockchain's core properties (immutability, transparency) for a socially important application.

    Explore related work through ORAA ResearchBrain.

    References (4)

    [1] Funda, V. (2025). A systematic review of algorithm auditing processes to assess bias and risks in AI systems. Journal of Infrastructure, Policy and Development.
    [2] Pasupuleti, M.K. (2025). Auditing Black-Box AI Systems Using Counterfactual Explanations. NESX Proceedings.
    [3] Pegwar, T. & Siddiqui, R. (2025). Blockchain + AI for Transparent and Auditable AI Models. International Journal of Latest Technology in Engineering, Management and Applied Science.
    [4] Jain, A. (2024). Blockchain-Powered Data Provenance for AI Model Audits. Scientific Journal of AI and Business Technology, 1(1).

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