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REVIEW 3 major objections 4 minor 164 references

A Survey of Blockchain-Based Privacy Applications: An Analysis of Consent Management and Self-Sovereign Identity Approaches

T0 review · 3 major / 4 minor · reviewed 2026-08-12 · deepseek-v4-flash

Pith's one-line read A survey of 98 blockchain privacy, consent, and identity papers concludes that privacy is not inherent to blockchain and most proposed solutions rely on external trusted entities, with few public implementations.

desk verdict A useful but overclaiming survey: the joint privacy/consent/SSI synthesis is legitimate, yet the headline code-availability result is not verifiable from the paper's own tables. read the letter →

arxiv 2411.16404 v1 pith:HM6EFOMW submitted 2024-11-25 cs.CR cs.ET

classification cs.CRcs.ET
keywords blockchainprivacyconsentmanagementself-sovereignidentitydatasharingsurveyGDPRdecentralized
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper is a survey of 98 blockchain-based works on privacy, consent management, and self-sovereign identity, organized around three research questions about privacy mechanisms, identity control, and supporting platforms. It argues that blockchain offers transparency, auditability, and immutability for multi-stakeholder data sharing, but privacy is not built in and must be added through external schemes. Reviewing the corpus by use case, privacy technique, platform, and software availability, the survey concludes that most proposed schemes use cryptographic tools such as encryption and zero-knowledge proofs yet tend to depend on external entities and trusted third parties to protect and process sensitive information, which limits the privacy they can actually provide. It also finds that few works make their code publicly available. The survey positions itself as the first to connect privacy, consent, and identity management together with implementation availability, and it draws a list of open research opportunities from that gap.

What carries the argument

The argument is carried by a classification grid rather than by a single theorem. Each of the 98 selected works is sorted by use case, by the privacy technique it employs, by whether it addresses consent or self-sovereign identity, by the blockchain platform used for prototyping, and by whether its software is available. A second organizing device is the three-layer privacy taxonomy: Layer-0 covers network-level tools, Layer-1 covers on-chain protocol techniques from homomorphic encryption to confidential transactions, and Layer-2 covers off-chain proofs such as zk-SNARKs, zk-STARKs, and Bulletproofs. These two grids generate the survey's conclusions: privacy is always an add-on, and most add-ons route sensitive material through external parties.

What would settle it

A repeatable search that adds backward and forward citation chasing, preprint sources, and direct code checks, and that finds a substantial set of surveyed-period systems offering full privacy, no trusted third parties, and public software, would overturn the paper's conclusion that the field is mostly proposals with limited implementations.

Watch

Extended reading notes

Core claim

The central claim is that blockchain cannot deliver privacy by itself: because transactions and smart-contract inputs are visible to consensus nodes, any privacy guarantee must come from mechanisms layered around the ledger. Analyzing 40 privacy works, 33 consent works, and 25 self-sovereign identity works, the survey finds that the dominant privacy techniques are data encryption, homomorphic encryption, access control, and zk-SNARK-related proofs, organized by network-layer, on-chain, and off-chain strategies. Its cross-cutting finding is that these schemes tend to rely on external entities and trusted third parties to protect and process sensitive information, and that most do not provide software, so the literature is rich in proposals but thin in deployable, trust-minimized implementations. The paper further claims that earlier surveys treat privacy, consent, or identity separately and that no existing study combines these dimensions with an analysis of open-source availability.

Load-bearing premise

The survey's conclusions depend on the corpus being complete and accurately summarized, yet the search covered only titles in three bibliographic databases, without citation chasing, grey literature, or independent verification of the 98 summaries.

Editorial extensions

If this is right

  • Applications that need both GDPR-style consent and blockchain auditability must combine on-chain access-control records with off-chain encrypted storage; neither blockchain alone nor off-chain storage alone suffices.
  • Practitioners should treat a system's privacy claim as limited whenever a trusted third party or external entity can see or process the sensitive data.
  • Researchers evaluating these schemes should measure not only security properties but also whether working code exists, since the survey finds most works lack software availability.
  • Privacy-focused platforms such as the ones surveyed often trade away smart-contract support or introduce trusted setups, so choosing a platform means accepting one of these limitations.
  • Open problems identified include on-chain encryption performance, post-quantum NTRU schemes, differential privacy versus encryption, cross-chain transactions, confidential assets, and decentralized identity interoperability.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • A consequence the authors leave implicit is that the field's bottleneck is deployment, not cryptographic invention: with most schemes never shipped, the next useful step is reference implementations and benchmarks rather than new schemes.
  • The survey's finding about trusted third parties suggests a testable taxonomy: rank the 98 works by the number and role of external trust assumptions and see whether privacy guarantees weaken as trust assumptions grow.
  • The layer table hints at a possible design rule: Layer-2 zero-knowledge proofs can give transactional privacy without trusted setups, so combining them with self-sovereign identity-based consent could yield fully trust-minimized systems; that combination is not yet evaluated in the surveyed corpus.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 4 minor

Summary. This manuscript is a survey of blockchain-based privacy applications, with a stated focus on consent management and self-sovereign identity (SSI). The authors describe a title-based literature search across Google Scholar, Scopus, and ACM Digital Library that yields 98 works, and they organize the reviewed works into three areas: privacy-preserving data sharing, consent management, and SSI. They also review privacy-focused blockchain protocols and identity management platforms, and conclude with open challenges. The paper's central claims are that privacy must be supplied as an external layer on top of blockchain, that few proposed solutions provide publicly available implementations, and that many schemes rely on external entities and trusted third parties, limiting privacy. The contributions are primarily classificatory and expository: there are no formal derivations or empirical measurements to evaluate.

Significance. If the corpus is complete and the classifications are accurate, the survey is a useful reference for researchers entering the area: it provides a structured comparison of 98 works, an explicit search methodology, and a publicly listed dataset on GitHub [41]. The paper also makes a falsifiable practical claim, namely that most surveyed proposals lack accessible implementations, which is a valuable observation if it is supported by the data. At the same time, the survey's value depends entirely on the correctness and completeness of its literature corpus and on the accuracy of the summary tables, since there are no formal results to verify. The absence of machine-checked proofs, quantitative evaluations, or systematic quality appraisal means the contribution is an organizing and synthesizing one rather than a technical one.

major comments (3)
  1. [Section 5.2, Tables 2 and 3; Section 5.3, Tables 5 and 6] The central availability claim is not verifiable from the manuscript's own tables. The text in Section 5.2 states, "As presented in Tables 2 and 3 ... few solutions provide the code on GitHub, while most do not provide any software availability information," and the table captions promise a code/software availability column. However, Tables 2 and 3 contain only Work, Publication Year, Use Case, and Privacy Technique columns; Tables 5 and 6 contain only Work, Publication Year, Use Case, and Key Contribution columns. The claimed software availability information appears only in a small number of footnotes and in the external GitHub dataset [41]. As a result, the quantitative basis for the conclusion that "few solutions provide the code on GitHub" cannot be independently checked from the paper. The authors should either add the promised availability columns to the tables, or present an explicit count of available/unavailable implementations in the text with a precise definition of what counts as "available" (e.g., linked public repository versus code mentioned in the paper body), and clearly state which of the 98 sources were assessed and how.
  2. [Section 9, Conclusion; Section 5.2] The conclusion that surveyed schemes "tend to rely on external entities and trusted third parties to protect and process sensitive information, limiting privacy" is not operationalized or directly supported by the presented tables. The tables classify privacy techniques but do not include a column or coding for trust assumptions, such as whether a scheme requires a centralized proxy re-encryption server, a trusted authority for key management, or an off-chain storage provider. Without a definition of what counts as reliance on a trusted third party, and without a per-work classification, this statement is an impression rather than a survey result. The authors should either add a trust-assumption dimension to the classification or revise the conclusion to state this as an interpretive observation with the specific supporting examples from the surveyed works.
  3. [Section 4, Survey Methodology] The completeness claims of the survey are stronger than the search methodology justifies. The selection procedure uses only title-field keyword searches in three databases, with no backward or forward citation chasing, no grey literature or preprint coverage, and no independent verification of the 98 retrieved summaries. Given this, the claim in Section 2 that "no existing study connects these aspects" is too strong: it is a claim about the entire literature, not just about the title-matched corpus. The authors should soften this claim to "no study found by our search connects these aspects" and add an explicit limitations paragraph discussing recall risk, including the fact that relevant work with different title wording would be missed.
minor comments (4)
  1. [Section 4, search string listing] The search-string numbering is inconsistent: the privacy strings are labeled S01, S02, and S03, and then the consent strings reuse S03, followed by S04 and S05, while the identity strings jump to S07, S08, and S09, skipping S06. This should be renumbered for clarity.
  2. [Section 1, last paragraph of the introduction] The sentence "Sections 6, 7. Section 8 identifies the opportunities..." is grammatically incomplete; it should read something like "Section 6 reviews privacy-focused blockchain platforms, Section 7 reviews identity management platforms, and Section 8 identifies opportunities for further research."
  3. [References, entry [49]] The first author of reference [49] is listed only as "Raghav" without a surname; this should be corrected to the full author name as it appears in the source publication.
  4. [Table 4] The table lists both "Anonymization" and "K-anonymity" as separate techniques, and also lists "Hash Anonymous Identity" separately; since several works use multiple techniques, the table would be clearer if the relationship between these categories and the individual works' primary classification were explained in a note.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the survey's classifications and conclusions are literature syntheses, not derivations from fitted inputs or self-citations.

full rationale

This is a survey paper with no fitted parameters, no predictive model, and no equations whose outputs could reduce to inputs. The central classificatory claims (privacy techniques, consent mechanisms, SSI approaches) are read off the 98 summarized primary sources; the gap claim that 'no existing study connects these aspects' is a literature assessment, not a derivation. The only self-citation is reference [10], used as an example of encryption-based privacy enhancement in the introduction; nothing in the survey's taxonomies, tables, or research opportunities depends on that paper's results. The statement that 'few solutions provide the code on GitHub' rests on the authors' external GitHub dataset [41] rather than on the printed tables; even if the tables omit the promised availability column, that is a verifiability/reproducibility weakness, not circular reasoning, because the conclusion is not true by definition and is not derived from a quantity fitted in this paper. No load-bearing self-citation chain, ansatz-smuggled-in-via-citation, uniqueness-imported-from-authors, or renamed-known-result pattern was found.

Assumptions & free parameters 0 free parameters · 2 assumptions · 0 invented entities

No free parameters or invented entities are introduced because the paper is a literature survey. Its contribution rests on two domain assumptions: the selected corpus is representative, and the authors' summaries of 98 external papers are accurate.

assumptions (2)
  • domain assumption The 98 works returned by the title-based search strings are representative of the blockchain privacy, consent, and self-sovereign identity literature.
    Section 4 limits searches to title fields in Google Scholar, Scopus, and ACM Digital Library, with no citation chasing, grey literature, or quality appraisal; the survey's classifications and gap analysis depend on this corpus being representative.
  • domain assumption The per-paper summaries in Tables 2 through 8 accurately reflect the technical content of each cited work.
    The survey does not provide independent verification or per-paper evidence for its 98 summaries; accuracy depends on the authors' reading of the cited papers.

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Cite this review

Pith. "Pith review of A Survey of Blockchain-Based Privacy Applications: An Analysis of Consent Management and Self-Sovereign Identity Approaches." pith.science (2026). https://pith.science/paper/HM6EFOMW

@misc{pith2026241116404,
  author       = {Pith},
  title        = {Pith review of: A Survey of Blockchain-Based Privacy Applications: An Analysis of Consent Management and Self-Sovereign Identity Approaches},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/HM6EFOMW}},
  note         = {Machine review of arXiv:2411.16404}
}
read the original abstract

Modern distributed applications in healthcare, supply chain, and the Internet of Things handle a large amount of data in a diverse application setting with multiple stakeholders. Such applications leverage advanced artificial intelligence (AI) and machine learning algorithms to automate business processes. The proliferation of modern AI technologies increases the data demand. However, real-world networks often include private and sensitive information of businesses, users, and other organizations. Emerging data-protection regulations such as the General Data Protection Regulation (GDPR) and the California Consumer Privacy Act (CCPA) introduce policies around collecting, storing, and managing digital data. While Blockchain technology offers transparency, auditability, and immutability for multi-stakeholder applications, it lacks inherent support for privacy. Typically, privacy support is added to a blockchain-based application by incorporating cryptographic schemes, consent mechanisms, and self-sovereign identity. This article surveys the literature on blockchain-based privacy-preserving systems and identifies the tools for protecting privacy. Besides, consent mechanisms and identity management in the context of blockchain-based systems are also analyzed. The article concludes by highlighting the list of open challenges and further research opportunities.

Figures

Figures reproduced from arXiv: 2411.16404 by the authors.

Figure 1
Figure 1. A timeline of some significant events in the context of blockchain, decentralized identity, and privacy regulations from 2008 [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
Figure 2
Figure 2. Blockchain data structure: blocks connected in chronological order in an append-only manner using a cryptographic hash [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. The flow of consent requests, user control, and selective sharing [PITH_FULL_IMAGE:figures/full_fig_p009_3.png] view at source ↗
Figures from the paper (3 more)
Figure 4
Figure 4. Figure 4: a) Centralized Identity Management and b) Federated Identity Management (FIM) models [PITH_FULL_IMAGE:figures/full_fig_p010_4.png]
Figure 5
Figure 5. Figure 5: The actors and roles in decentralized identity management [PITH_FULL_IMAGE:figures/full_fig_p011_5.png]
Figure 6
Figure 6. Figure 6: Relevant publications aligned with the objectives of this survey obtained from Google Scholar, Scopus, and ACM Digital [PITH_FULL_IMAGE:figures/full_fig_p012_6.png]

Discussion (0). Continue with ORCID to comment.

Reference graph

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Pith tools

Reviewed August 12, 2026 · model on record in the stance chip above.