Legal opinion · 8 pp · Issued 21 April 2026 · Updated 5 May 2026 · CC BY-ND 4.0

Legal Opinion on the Admissibility and Evidentiary Value of ProofSnap as a Means of Evidence

About this publication. A 8-page memorandum prepared by SEDLAKOVA LEGAL s.r.o. (Brno-Medlánky, Czech Bar Association member) under EU law (Regulation 910/2014, eIDAS) with reference to Czech civil procedure. Disclosure: the opinion was commissioned by ProofSnap (Software Innovations Group LLC) and is published here on the product website for distribution. The PDF is the authoritative version — this page is a publication summary. The English translation and the cross-references to the US Federal Rules of Evidence (FRE 901, 902(13)–(14), 707) and the English Civil Procedure Rules (CPR 32, CPR 35) are not part of the original opinion; they were added by the ProofSnap team for orientation of common-law readers.

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civil, criminal and administrative proceedings (CZ → EU → US/UK applicability)
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Author

The English translation, the cross-references to the US Federal Rules of Evidence and English Civil Procedure Rules, and the cited US case law (United States v. Vayner, Lorraine v. Markel, Mendones v. Cushman & Wakefield, proposed FRE 707) are not part of the original opinion; they were added by the ProofSnap team for orientation of common-law readers.

Key facts at a glance

9
pages of legal analysis · 3,938 words
27
EU Member States covered by direct eIDAS Article 41(2) presumption
4
cited US authorities: Vayner (2014), Lorraine (2007), Mendones (2025), proposed FRE 707 (2026)
2026
issued 21 April 2026, updated 5 May 2026 · CC BY-ND 4.0

Authentication standards covered

  • § FRE 901(a) — Authenticating evidence (US)
  • § FRE 902(13)–(14) — Self-authenticating electronic records and certified hashes (US)
  • § Proposed FRE 707 — Machine-generated evidence (US, 2025–2026)
  • § FRE 702 / Daubert — Expert reliability standards (US)
  • § eIDAS Article 41 — Legal effect of electronic timestamps (EU)
  • § eIDAS Article 42 — Requirements for qualified electronic timestamps (EU)
  • § CPR Part 32 & 35 — Evidence and expert witnesses (England & Wales)
  • § ISO/IEC 27037:2012 — Digital evidence handling

Executive summary

In four sentences

The full reasoning, citations and disclaimer are in the 8-page PDF.

  1. 1

    ProofSnap outputs are admissible as means of evidence in civil, criminal and administrative proceedings (FRE 901 · CPR 32 · eIDAS Article 41); however, evidence.pdf is a private document — when authenticity is challenged, the burden of proof rests on the submitting party.

  2. 2

    The qualified eIDAS timestamp issued by Disig a.s. (EU Trusted List, Article 42) carries the statutory presumption of accuracy under Article 41(2) eIDAS — shifting the burden of disproof to the opposing party, directly across all 27 EU Member States.

  3. 3

    The opinion describes ProofSnap as "a suitable and economical alternative" to notary fact certification of website state — instant, cryptographically anchored, materially cheaper and faster than a notarial deed of facts (which remains a public document with a presumption of authenticity, but typically requires hours to days to draft).

  4. 4

    With the rise of generative AI, plain screenshots will no longer suffice — the opinion warns that "cases in which authenticity is challenged will increase"; multi-layer authentication (hash + signature + blockchain + qualified timestamp) is the new minimum standard.

Read the full reasoning ↓ · Download PDF

Methodology & scope

What this opinion covers — and what it does not

In scope

  • Admissibility of ProofSnap outputs before courts and administrative authorities
  • Evidentiary value (free evaluation, presumption shift) under EU and Czech procedural law
  • eIDAS Articles 41–42 application to qualified electronic timestamps
  • Procedural function of each file in the evidence package
  • Comparison with notarial fact certification (notarial deed of website state)

Out of scope

  • ×Substantive truth of statements contained in captured displays
  • ×Lawfulness of obtaining the recording (third-party rights, trade secrets)
  • ×National procedural rules of individual EU Member States (the opinion is drafted from EU-law perspective)
  • ×Common-law-specific authentication doctrines (FRE 901/707, CPR 32 — added by ProofSnap team for orientation)
  • ×Specific case advice — for your matter, consult counsel admitted in your jurisdiction

Materials reviewed: Access credentials to the live ProofSnap system · ProofSnap product website (getproofsnap.com). No documentary or other materials were provided beyond these.

Standards referenced: Regulation (EU) No 910/2014 (eIDAS) as amended by 2024/1183 · Regulation (EU) 2024/1689 (EU AI Act) · ISO/IEC 27037:2012 (digital evidence handling) · RFC 3161 (timestamping protocol).

Jurisdictional applicability

Scope of direct applicability

The opinion is grounded in Regulation (EU) No 910/2014 (eIDAS), as amended by Regulation 2024/1183 — directly applicable Union law, in force identically across all 27 EU Member States since 20 May 2024.

  • §Article 41(1) — an electronic timestamp shall not be denied legal effect or admissibility as evidence solely on the grounds that it is in electronic form.
  • §Article 41(2) — qualified electronic timestamps enjoy a statutory presumption of accuracy of date, time and data integrity, operative in all EU courts.
  • §Article 42 — requirements for a qualified electronic timestamp; Disig a.s. satisfies these as a Slovak QTSP on the EU Trusted List.

Outside the EU, the eIDAS presumption is not automatic. The opinion does not address common-law authentication doctrines directly; the cross-references to FRE 901 / 902(13)–(14), the Civil Evidence Act 1995, CPR 32 and comparable Australian / Canadian rules in this page were added by the ProofSnap team and are not part of the original opinion.

For specific disputes, consult an attorney admitted in the relevant jurisdiction.

Key conclusions of the opinion

Four central findings with direct consequences for the procedural use of ProofSnap outputs across US, UK and EU courts.

Section III.A

Usable across all proceeding types

ProofSnap outputs are generally usable as means of evidence in civil proceedings, criminal proceedings, and administrative proceedings — in all EU Member States and in common-law jurisdictions whose evidentiary frameworks accept authenticated electronic records.

Civil-law and common-law systems alike apply a free-evaluation principle to electronic evidence, gated by an authentication threshold (FRE 901, CPR 32.4, Article 9 eIDAS).

Section III.B

evidence.pdf is the primary documentary evidence

The evidence.pdf file is intelligible to non-IT readers (judges, paralegals, administrative officers) and procedurally easy to tender as documentary evidence. It is a private document — when authenticity is challenged, the submitting party bears the burden of proof.

ProofSnap addresses this through the complete evidence package (hash, signature, blockchain, timestamp), which substantiates authenticity.

Section III.C

eIDAS timestamp strengthens the evidentiary position

The qualified electronic timestamp issued by Disig a.s. (Slovak QTSP, on the EU Trusted List) carries the statutory presumption of accuracy of date, time and data integrity under Article 41(2) eIDAS. The combination of OpenTimestamps + eIDAS timestamp is described in the opinion as a "well-thought-through" data-integrity solution.

Available on Enterprise and Company plans, plus pay-per-use eIDAS SnapPack. The timestamp shifts the burden of proof to the opposing party — directly across all 27 EU Member States and persuasively in US, UK and Commonwealth courts.

Section III.D

Cost-effective alternative to notary fact certification

The opinion describes ProofSnap as "a suitable and economical alternative" to notary fact certification of website state. A notarial deed is a public document with a statutory presumption of authenticity, but is materially more expensive and time-intensive than an electronic capture — during the drafting interval, content may be modified or deleted, with consequent loss of evidentiary value.

US and UK case law on the evidentiary value of screenshots

How federal and state courts treat screenshots as evidence — and why a qualified eIDAS timestamp plus cryptographic chain makes the difference.

United States v. Vayner · 2d Cir. 2014

Facebook screenshot rejected for failure of authentication

The Second Circuit reversed a conviction where a Facebook profile printout had been admitted without sufficient authentication under Federal Rule of Evidence 901 (United States v. Vayner, 769 F.3d 125 (2d Cir. 2014)). The court held that a printout's "appearance, contents, substance, [or] internal patterns" alone were inadequate to establish authorship; corroborating evidence of provenance was required.

Application: The cryptographic provenance chain (SHA-256, RSA-4096 signature, Disig eIDAS timestamp, OpenTimestamps anchor, ISO/IEC 27037 chain of custody) directly addresses the gap identified in Vayner — providing distinctive characteristics admissible under FRE 901(b)(4) and self-authenticating under FRE 902(13)–(14).

Lorraine v. Markel · D. Md. 2007

The five-factor authentication framework for ESI

Magistrate Judge Paul Grimm's seminal opinion (Lorraine v. Markel American Insurance Co., 241 F.R.D. 534 (D. Md. 2007)) sets the framework still applied today: electronically stored information (ESI) must satisfy authentication (FRE 901), best evidence (FRE 1001–1008), hearsay (FRE 801–807), relevance (FRE 401), and FRE 403 balancing.

Application: The complete evidence package — manifest with SHA-256 hashes, RSA-4096 signature, blockchain timestamp, and forensic log — produces a verifiable record that satisfies all five Lorraine factors, particularly authentication and the best-evidence requirement for the original ESI.

Mendones v. Cushman & Wakefield, Inc. · Cal. Super. Ct. (Alameda Cnty., 9 Sept. 2025)

Case dismissed after deepfake video discovered as evidence

On 9 September 2025, Judge Victoria Kolakowski of the California Superior Court (Alameda County) dismissed the plaintiffs' case with prejudice after determining that several exhibits were AI-generated deepfakes. The metadata claimed an iPhone 6 Plus capture running iOS 12.5.5, but the AI-driven editing artefacts required Apple Intelligence — introduced only with iOS 18 and supported on iPhone 15 Pro / 15 Pro Max. Judge Kolakowski further found the depicted persons lacked expressiveness, were monotone, did not pause appropriately, and exhibited mismatched mouth movements. Terminating sanctions followed.

Application: A Provenance Certificate with eight integrity checks (live-browser fingerprint, NTP-anchored time, DNS verification, TLS validation, automation detection, etc.) that produces verifiable evidence the capture is genuine — directly addressing the deepfake-discovery scenario that disposed of Mendones.

Proposed FRE 707 · public comment 2025–2026

Machine-generated evidence to face expert reliability scrutiny

On 16 August 2025 the Committee on Rules of Practice and Procedure of the Judicial Conference of the United States released proposed Federal Rule of Evidence 707 (public comment closed 16 February 2026). The rule would subject machine-generated evidence — including AI-detection outputs and AI-generated content — to the same Daubert reliability standards (FRE 702) as expert testimony, addressing the proponent's burden to show the AI output is based on sufficient facts or data, produced through reliable principles and methods, and that those methods were reliably applied.

Application: Each evidence package fixes the moment of capture to the second through a qualified eIDAS timestamp (Disig, EU Trusted List) and, additionally, through a Bitcoin blockchain timestamp — verifiable and reproducible inputs that meet Daubert reliability factors (testability, peer review, error rate, general acceptance).

Sources: United States v. Vayner, 769 F.3d 125 (2d Cir. 2014) · Lorraine v. Markel American Insurance Co., 241 F.R.D. 534 (D. Md. 2007) (Magistrate Judge Paul W. Grimm) · Mendones v. Cushman & Wakefield, Inc., Cal. Super. Ct. Alameda Cnty. (Judge Victoria Kolakowski, decided 9 September 2025) · Proposed Federal Rule of Evidence 707 (Judicial Conference of the United States, released 16 August 2025; public comment closed 16 February 2026) · Regulation (EU) No 910/2014 (eIDAS) as amended by Regulation (EU) 2024/1183 (in force since 20 May 2024). This selection provides professional orientation and does not substitute for legal advice.

Section III — Evidentiary value

Where authenticity is challenged

Where the opposing party objects to authenticity, the procedural posture differs materially depending on the cryptographic safeguards attached to the captured record.

Plain screenshot — treated as a private document; the submitting party bears the burden of proof. The court evaluates under free evaluation of evidence (FRE 401/403, CPR 32.1). Expert testimony in IT or cybersecurity (FRE 702 / CPR 35) is typically required to authenticate the record — with the attendant time and cost. Evidentiary weight is "materially reduced" in the face of substantiated objections regarding integrity, origin or timestamp.

Cryptographically anchored capture without qualified timestamp — private document strengthened by SHA-256 hash, RSA-4096 signature and OpenTimestamps blockchain anchoring. The court still evaluates under free evaluation of evidence; expert testimony may still be required if challenged, but the technical safeguards make a contested authenticity claim more difficult to sustain. No statutory presumption applies.

Capture with qualified electronic timestamp under Article 42 eIDAS — the statutory presumption of accuracy of date, time and data integrity under Article 41(2) eIDAS attaches directly. The burden of disproof shifts to the opposing party. The presumption operates directly across all 27 EU Member States; in common-law systems (US, UK, AU, CA) the QTSP-issued timestamp is highly persuasive under FRE 901 and CPR 32 authentication standards, but does not benefit from automatic statutory presumption.

Practical consequence

Where an authenticity challenge can reasonably be anticipated — family law, employment disputes, IP enforcement, criminal complaints in cyber-harassment — a qualified eIDAS timestamp is best treated as insurance against evidentiary failure. The opinion concludes that, from the standpoint of professional risk and procedural posture, securing an eIDAS-timestamped capture is the materially safer position.

Key quotes from the opinion

Direct quotes from Section III (Opinion) and the Conclusion.

"The outputs of the ProofSnap service are, from the perspective of Czech procedural law and the EU legal framework, generally usable as means of evidence in any type of proceedings."

— Conclusion of the opinion

"Proving facts by means of a ProofSnap output therefore appears to be a suitable and economical alternative for demonstrating an electronic record."

— Section III, Evidentiary value

"With the rise of generative AI, proof by means of website 'screenshots' will no longer be sufficient — cases in which authenticity of such documents is challenged will increase."

— Conclusion of the opinion

Files of the evidence package — counsel's view

The opinion evaluates each file produced by ProofSnap with respect to its procedural function.

File Legal function per the opinion
evidence.pdf Primary documentary evidence — private document (with statutory presumption attaching to the qualified timestamp metadata), readable by non-IT professionals.
screenshot.jpeg Visual capture of the website. Real evidence (judicial inspection in civil-law systems; demonstrative evidence in common-law systems).
metadata.json Contextual data: timestamp, URL, browser information.
manifest.json + .sig SHA-256 hashes of all files + RSA-4096 signature of the manifest — the authentication backbone.
manifest.json.ots OpenTimestamps anchoring of the manifest hash on the Bitcoin blockchain.
manifest.json.tsr Qualified eIDAS timestamp per Article 42 eIDAS, issued by Disig a.s. (RFC 3161). Attaches the presumption of accuracy under Article 41(2). Enterprise/Company.
eidas_validation.json Validation metadata for the eIDAS timestamp. Enterprise/Company.
publickey.pem Public key for signature verification.
domtextcontent.txt + page.html Extracted DOM text and complete HTML content.
forensic_log.json Forensic log per ISO/IEC 27037 with a hash chain for every operation.
chain_of_custody.json Chain-of-custody record with device integrity and NTP time verification.
provenance_certificate.pdf Provenance Certificate — a user-friendly summary of the integrity chain (8 integrity checks).
capture_video.webm Optional video recording — supplementary real evidence against authenticity challenges, particularly for dynamic content (social media, video playback).

Per the file enumeration in the opinion. Actual file count in the evidence package: 11 (Essential) / 12 (Professional) / 15 (Enterprise and Company).

Why the opinion matters now: generative AI, deepfakes, FRE 707 and the EU AI Act

The opinion warns: "With the rise of generative AI, proof by means of website 'screenshots' will no longer be sufficient — cases in which authenticity of such documents is challenged will increase."

Proposed FRE 707 · public comment 2025–2026

Machine-generated evidence under Daubert reliability

Proposed Federal Rule of Evidence 707 (Judicial Conference, August 2025; public comment to 16 February 2026) would subject machine-generated evidence to the same reliability standards as expert testimony. Courts will increasingly demand verifiable provenance for digital records. ProofSnap's evidence package provides exactly this provenance proof.

EU AI Act · Article 50, August 2026

Transparency obligation for AI-generated content

Regulation (EU) 2024/1689 requires labelling of AI-generated content from August 2026. The bar for authenticity and provenance of digital records in court rises substantially. Combined with US criminal statutes addressing deepfakes (e.g. 18 U.S.C. § 1462 for non-consensual deepfake imagery, state statutes), criminal complaints require immediate evidence preservation — content typically disappears before law-enforcement intake.

Bottom line: A plain screenshot is no longer sufficient. Recommended: evidence.pdf + complete cryptographic package + qualified eIDAS timestamp — as in ProofSnap Enterprise (Disig, EU Trusted List).

Download & cite

Get the full opinion

Cite this opinion

SEDLAKOVA LEGAL s.r.o., Legal Opinion: ProofSnap as a Means of Evidence
and Assessment of Its Evidentiary Value, 21 April 2026.
Available at https://getproofsnap.com/legal-opinion.pdf
(last visited [DATE]).

Need an opinion specific to your jurisdiction? Contact SEDLAKOVA LEGAL directly: office@sedlakovalegal.com · sedlakovalegal.cz ↗. For specific matters, consult counsel admitted in your jurisdiction.

Frequently asked questions

Common questions about the legal opinion and its application in US, UK, EU and Commonwealth jurisdictions.

Disclaimer

This legal opinion was prepared by SEDLAKOVA LEGAL s.r.o. under EU law with reference to Czech procedural law and translated into English by the ProofSnap team. The conclusions express the legal view of the author, are not legally binding, and are intended neither for transmission to third parties nor for use in court or other proceedings. The cross-references to the US Federal Rules of Evidence, the English Civil Procedure Rules, and US case law (US v. Vayner, Lorraine v. Markel, Mendones v. Cushman & Wakefield, proposed FRE 707) are by the ProofSnap team and are not part of the original opinion. For your specific case, consult an attorney admitted in your jurisdiction.

Publication

This page is published by ProofSnap (Software Innovations Group LLC) on commission of the legal opinion. The PDF is the authoritative version. Independent verification of any ProofSnap evidence package is available via the open-source Trust Verifier at getproofsnap.com/verify/index.html.

Opinion authored by SEDLAKOVA LEGAL s.r.o., Brno · Company ID 05669871 · Issued 21 April 2026 · Licensed under CC BY-ND 4.0.

Download opinion (PDF, 8 pp.)