# Capture the Web as Evidence.
Trustworthy. Irrefutable.

ProofSnap turns any webpage into court-admissible digital evidence. Every capture includes a full-page screenshot, metadata, SHA-256 hash, digital signature, and a blockchain timestamp — bundled into a tamper-evident ZIP archive with a complete chain of custody you can verify independently.

Optimized for LinkedIn, WhatsApp, Slack, Discord, Telegram, Airbnb, and 10+ platforms. Save social media posts before they're deleted, document cyberbullying evidence, capture AI chatbot responses for EU AI Act compliance. eIDAS 2 aligned. Start with a 7-day free trial.

Download Extension Watch Demo (41s)

## ProofSnap at a Glance

Type:
  Chrome Extension (Google Chrome 88+, Edge, Brave)
Hashing:
  SHA-256 (NIST-standardized)
Digital Signature:
  RSA-4096 asymmetric encryption
Blockchain:
  Bitcoin via OpenTimestamps (immutable)
Compliance:
  eIDAS 2, EU AI Act, DSA
Legal Standards:
  FRE 901/902 (US), eIDAS 2 (EU), common law authentication
Platforms:
  WhatsApp, Instagram, LinkedIn, Telegram, Discord, Slack, Airbnb, X, Reddit
Evidence Package:
  ZIP with 11 files (screenshot, PDF, HTML, metadata, manifest, signature, OTS)
Free Trial:
  7 days free with all plans
Pricing:
  From $8.99/month (Essential) to $24.99/month (Enterprise)

## See ProofSnap in Action

Watch how ProofSnap captures legally admissible web evidence with blockchain timestamping in just 41 seconds.

0:41

Learn how ProofSnap creates court-admissible digital evidence in 41 seconds

Click to watch on YouTube

## How ProofSnap Works

1

### Navigate to Target Webpage

Open any web page you want to capture as evidence.

2

### Open ProofSnap Extension

Open the ProofSnap extension to begin the capture process and then click "Capture page snapshot".

3

### Download Evidence Package

Download a comprehensive ZIP archive containing all evidence files, cryptographic proofs, and blockchain timestamps by clicking "Download zip" — or download individual files using the download icon in the Action column. Store securely on your device or in the cloud.

4

### Verify with Trust Verifier

Upload your ProofSnap ZIP evidence package using the upload field, then click "Verify Evidence Package" to automatically check cryptographic integrity, validate digital signatures, and confirm blockchain timestamps. You can also use the Trust Verifier below for independent verification.

The complete workflow at a glance.

## What's Inside the Evidence Package

Every capture produces a ZIP archive with 11 files. Here's exactly what you get.

### Visual Evidence

`screenshot.jpeg`

Full-page scrolling capture of the entire webpage

`evidence.pdf`

Human-readable forensic summary with all metadata

### Complete Page Data

`page.html`

Complete HTML source code of the page

`domtextcontent.txt`

Extracted visible text content

`metadata.json`

URL, timestamp, browser info, TLS certificate

### Forensic Integrity

`forensic_log.json`

ISO/IEC 27037 forensic log with tamper-evident hash chain

`chain_of_custody.json`

Chain of custody with device integrity and NTP time verification

### Cryptographic Proof

`manifest.json`

SHA-256 hashes of every file in the package

`manifest.sig`

RSA-4096 digital signature of the manifest

`publickey.pem`

Public key for independent signature verification

### Blockchain Timestamp

`manifest.json.ots`

OpenTimestamps proof anchored to the Bitcoin blockchain

Immutable proof of when the evidence was captured. Cannot be forged or backdated. Independently verifiable by anyone.

See exactly what a court receives

Download Sample Evidence Package

See for yourself — open the ZIP, check the PDF, verify the hash. Or send a URL to support@getproofsnap.com and we'll capture it for you free.

## Flexible Plans for Every Stage

Choose your plan and activate it directly in the app.

→ Save 20%

### Essential

$8.99

per month

Monthly Snapshots: 100

- 7-day free trial included
- Export individual files
- Export ZIP archive
- Legal-grade metadata (timestamp, hash, source)
- Blockchain (OpenTimestamps)

Regular use, archiving

Most Popular

### Professional

$16.99

per month

Monthly Snapshots: 200

- 7-day free trial included
- Export individual files
- Export ZIP archive
- Legal-grade metadata (timestamp, hash, source)
- Blockchain (OpenTimestamps)

Verified timestamping, audit-grade documentation

### Enterprise

$24.99

per month

Monthly Snapshots: Unlimited

- 7-day free trial included
- Export individual files
- Export ZIP archive
- Legal-grade metadata (timestamp, hash, source)
- Blockchain (OpenTimestamps)

High-volume teams, compliance-driven workflows

### Essential (Annual)

$80
$107.88

per year

Monthly Snapshots: 100

- 7-day free trial included
- Export individual files
- Export ZIP archive
- Legal-grade metadata (timestamp, hash, source)
- Blockchain (OpenTimestamps)

Regular use, archiving

Most Popular

### Professional (Annual)

$160
$203.88

per year

Monthly Snapshots: 200

- 7-day free trial included
- Export individual files
- Export ZIP archive
- Legal-grade metadata (timestamp, hash, source)
- Blockchain (OpenTimestamps)

Verified timestamping, audit-grade documentation

### Enterprise (Annual)

$240
$299.88

per year

Monthly Snapshots: Unlimited

- 7-day free trial included
- Export individual files
- Export ZIP archive
- Legal-grade metadata (timestamp, hash, source)
- Blockchain (OpenTimestamps)

High-volume teams, compliance-driven workflows

### Company Plans

Flexible team licensing for organizations. Unlimited snapshots for all team members.

Best Value

#### Annual

$130
/license/year

Minimum 2 licenses

- 7-day free trial included
- Unlimited snapshots per user
- Blockchain timestamping
- Team management dashboard
- Admin controls & user management
- Priority support

Perfect for legal teams, compliance departments, and enterprises

#### Monthly

$13
/license/month

Minimum 2 licenses

- 7-day free trial included
- Unlimited snapshots per user
- Blockchain timestamping
- Team management dashboard
- Admin controls & user management
- Priority support

Flexible monthly billing for teams

Not sure yet? Download a sample evidence package to see exactly what you get — or send a URL to support@getproofsnap.com and we'll capture it for you free.

Start Free 7-Day Trial
4.5/5 on Chrome Web Store

## Who Uses ProofSnap and Why

### Lawyers, Auditors & Compliance

Document evidence for legal proceedings and regulatory compliance

- Timestamped snapshots for dispute resolution
- Audit-ready exports for regulatory filings
- Cryptographic hash for integrity
- Contract, Employment disputes

> "Screenshots aren't enough in court. ProofSnap gives us the structure, timestamp, and traceability we need."

### Journalists & Digital Investigators

Preserve online evidence for investigative reporting and OSINT research

- Capture controversial posts or deleted pages
- Export as PDF or ZIP for transparency
- Embed source URL, timestamp, browser context
- Digital forensics, website changes, online harassment

> "ProofSnap lets us document the truth before it's edited, censored, or erased."

### Freelancers & Developers

Snapshot staging sites, track deployments, and share verified proof with clients

- Save snapshots of staging or live releases
- Include DOM for frontend debugging
- Share ZIPs with clients or QA
- Timestamped proof for verification
- Web archiving, version control, data collection

> "It's like Git for the browser — I can prove exactly what the site looked like when I shipped it."

### SEO Managers

Track and document SEO changes with timestamped web page snapshots

- Save snapshots of live pages before and after SEO optimization
- Archive DOM structure to verify technical SEO elements (meta tags, schema, canonical links)
- Timestamp page states for Google indexing disputes or client reporting
- Share ZIPs with stakeholders to validate crawlability and content visibility
- Collect audit-ready evidence for algorithm updates, ranking drops, or compliance checks

> "It's like Ahrefs for visual evidence — I can timestamp exactly what the site looked like when it launched, down to the DOM."

### HR Managers, Recruiters, Visa Officers, Talent Ops

Verify candidates, archive onboarding flows, and document employment records

- LinkedIn profile snapshots for candidate verification, post validation, and prevention of profile falsification
- Timestamped proof for employment validation and visa processing
- Archive candidate documents for compliance and audit
- Save snapshots of onboarding portals and signed contracts
- HR archiving, onboarding version control, and data integrity

> "It gives us a timestamped snapshot of the entire onboarding flow — perfect for audits, visa processing, or internal reviews."

### Insurance Agents, Claims Adjusters, Underwriters

Capture claims evidence, archive policies, and build audit-ready documentation

- Timestamped proof for claims validation and incident reporting
- Archive policyholder documents for compliance and audit readiness
- Save snapshots of onboarding portals, signed policies, and payout approvals
- Share ZIP bundles with legal, underwriting, or reinsurance teams

> "It gives us a timestamped snapshot of the entire claims and policy onboarding flow — ideal for validation, audit readiness, and reinsurance coordination."

### Anyone Who Needs Trusted Snapshots

Save pricing pages, receipts, agreements, or any web content you may need later

- Save pricing pages, policies, receipts
- Archive agreements or service terms
- Use for personal records or disputes
- Exportable, portable, legally meaningful

> "I don't just save what I see — I save what it means."

## Resources & Insights

Practical guides on digital evidence, compliance, and online verification.

NEW 2026 Deepfake Defense

### How Evidence Survives Deepfake Objections Under FRE 707

Provenance Certificate with 8 integrity checks. Case law: Mendones v. Cushman (2025). FRE 707, Louisiana Act 250, EU AI Act Art. 50.

8 min read Read article
NEW 2026 Evidence Authentication

### How to Authenticate Web Evidence That Survives Cross‑Examination

Screenshots fail under FRE 901. SHA-256 hashes, blockchain timestamps, ISO 27037 chain of custody, and open-source verification survive. Case law, Page Vault comparison.

7 min read Read article
NEW 2026 Divorce & Custody

### Divorce & Custody: How to Capture Social Media Evidence for Court

81% of divorce attorneys report a surge in social media evidence (AAML). Capture Facebook, Instagram, WhatsApp, dating apps before they disappear. CA, TX, FL, NY state rules. FRE 901, eIDAS 2.

14 min read Read article
NEW 2026 Cyberbullying

### Cyberbullying Evidence: How to Document It for Police & Court

46% of teens cyberbullied. Messages get deleted, accounts vanish. 5-step guide to capturing evidence police and courts accept. WhatsApp, Instagram, Discord, TikTok. UK, US, AU, CA, NZ, EU laws.

12 min read Read article
NEW 2026 Brand Protection

### Brand Protection for E-Commerce: Amazon, Temu & Global Marketplaces

$467B counterfeit trade. Document Buy Box hijacking, fake reviews & counterfeits. US Lanham Act, EU DSA, eIDAS 2, FRE 901. Case law & evidence playbook.

35 min read Read article
NEW 2026 OSINT

### OSINT 101: Preserve Social Media Evidence Before It’s Deleted

X, LinkedIn, Telegram & 6 more platforms. FRE 901 authentication, blockchain timestamps, GDPR, deepfake challenges, 15 FAQ. OSINT guide.

40 min read Read article
NEW 2026 Blockchain

### How to Verify OpenTimestamps (.ots) Files: 3 Methods

Got an .ots file? Verify it in 30 seconds online. 3 free methods. What the result means, how to fix “pending”, legal admissibility (eIDAS 2, FRE 902). OSINT bulk verification.

6 min read Read article
NEW 2026 All Countries

### How to Document Online Scams for Police, Banks & Courts

FBI IC3: $16.6B losses in 2024. 7 scam types, IC3/Action Fraud reporting, Visa 13.3 chargebacks, FRE 901, eIDAS 2. Evidence guide.

30 min read Read article
NEW 2026 Fake Reviews

### Fake Reviews & Astroturfing: Evidence for Legal Action

FTC $51,744/violation. Lanham Act lawsuits. UK CMA 10% turnover fines. 275M+ fake reviews blocked by Amazon. Evidence workflow & case studies.

25 min read Read article
NEW 2026 Dubai

### Dubai Airbnb Rules 2026: Avoid AED 100,000 Fines

DET Holiday Home permit, Tourism Dirham AED 10-15/night, no minimum stay, 3-hour guest check-in. Complete guide with profitability data.

18 min read Read article
NEW 2026 Global HR

### Fake LinkedIn Profile: How to Spot in 2026 | Global HR Evidence Guide

Gartner: 1 in 4 profiles fake by 2028. RFC 3161 + Bitcoin blockchain = gold standard for EEOC, Fair Work AU, UK Tribunal defense.

50 min read Read article
NEW 2026 EU AI Act

### Who's Liable When Your AI Lies? The AI Flight Recorder for 2026

EU AI Act fines reach €35M from Aug 2026. Air Canada lost its chatbot case. Learn why every business needs an AI flight recorder.

25 min read Read article
2026 Legislation eIDAS 2

### Why Regular Screenshots Fail in Court in 2026

From May 2026, new EU rules for digital evidence apply. Learn what's changing and how to prepare.

12 min read Read article
Chargeback Guide Consumer Rights

### How to Win a Chargeback: Item Not as Described (2026 Guide)

Step-by-step guide to winning chargebacks. Reason codes (Visa 13.3, Mastercard 4853), compelling evidence, and real lawsuit cases.

14 min read Read article
NEW 2026 NYC

### Short-Term Rental Regulations USA 2026: NYC's $7,500 Fines & How to Protect Yourself

Complete guide to Local Law 18, OSE inspector tactics, and how to document compliance with blockchain evidence.

20 min read Read article
NEW 2026 London

### UK Short-Term Rental Regulations 2026: London's 90-Day Rule & How to Protect Yourself

London's 90-day cap, mandatory registration scheme, and HMRC reporting. How hosts can document compliance with timestamped evidence.

18 min read Read article
NEW 2026 Sydney

### Australia Airbnb Rules 2026: Sydney 180-Day Cap, Byron Bay 60 Days & Melbourne Levy

Sydney's 180-day cap, Byron Bay's 60-day limit, Melbourne's 7.5% levy, and AS 1851 fire safety. State-by-state compliance guide.

22 min read Read article
NEW 2026 Greece

### Greece Airbnb Rules 2026: AMA, Fines Up to €20,000 & Athens Ban

AMA mandatory, climate fee €8/night, Athens ban Districts 1–3, Law 5170/2025 safety, Golden Visa STR ban, HMRC/IRS/FATCA for non-resident investors.

25 min read Read article
NEW 2026 Portugal

### Portugal Short-Term Rental Rules 2026: RNAL, Taxes & Fines Up to €40,000

RNAL registration, IRS 35%, Lisbon/Porto containment zones, Decreto-Lei 76/2024, HMRC/IRS/FATCA for non-residents, ENI vs Lda, EU Regulation 2024/1028.

30 min read Read article
NEW 2026 Italy

### Italy STR Rules 2026: CIN Code, Taxes & Fines for Foreign Owners

CIN mandatory, cedolare secca 21–26%, fines up to €8,000, key box ban. Guide for US, UK & AU property owners in Italy.

18 min read Read article
NEW 2026 Barcelona

### Barcelona Airbnb Ban 2026: New Rules, Fines & 2028 Phase-Out

All 10,000 HUT licences expire Nov 2028. New holiday declaration required. Fines up to €600,000. PEUAT zones. Constitutional Court upheld ban.

12 min read Read article
NEW 2026 Spain

### Airbnb Rules Spain 2026: 17 Regions, Fines up to €600,000 & Complete Compliance Guide

Barcelona's tourist license freeze, Malaga's ban, Madrid's 90-day cap. Region-by-region breakdown with fines up to €600K.

25 min read Read article
View all articles →

### Quick Answers

#### What is ProofSnap?

ProofSnap is a Chrome extension that captures web pages as legally admissible digital evidence with blockchain timestamping, SHA-256 cryptographic hashing, and RSA-4096 digital signatures. It creates tamper-proof evidence packages containing screenshots, metadata, HTML content, and cryptographic proofs that can be independently verified. ProofSnap is used by lawyers, investigators, compliance teams, and individuals to preserve web content before it's deleted or modified, with evidence suitable for court proceedings, regulatory audits, and legal disputes.

#### Are screenshots admissible as evidence in court?

Plain screenshots alone are generally insufficient as court evidence because they can be easily manipulated and lack proof of when they were taken. Under FRE 901/902 (US Federal Rules of Evidence) and eIDAS 2 (EU), digital evidence must be authenticated to be admissible. To make screenshots court-admissible, they need a cryptographic chain of custody: a SHA-256 hash proving content integrity, a digital signature proving authenticity, and a blockchain timestamp proving the exact capture time. ProofSnap automatically creates all three cryptographic proofs for every web page capture, making your screenshots significantly more defensible in legal proceedings.

#### How to preserve a web page as evidence?

To preserve a web page as legally admissible evidence: 1) Install ProofSnap Chrome extension, 2) Navigate to the web page you need to capture, 3) Click "Capture page snapshot" to create a forensic evidence package. ProofSnap automatically captures the full-page screenshot, complete HTML source, extracted text content, metadata (URL, timestamp, browser info, TLS certificate), and session data. Everything is bundled into a tamper-evident ZIP archive with SHA-256 cryptographic hashes, an RSA-4096 digital signature, and a Bitcoin blockchain timestamp via OpenTimestamps. This creates a verifiable chain of custody that proves the content existed at a specific point in time and has not been altered.

#### Comparison: Normal Screenshot vs. ProofSnap Evidence Package

Feature | Normal Screenshot | ProofSnap Evidence Package
--- | --- | ---
Evidentiary Value | Low — no proof of when or how captured | High — cryptographic chain of custody
Tamper Protection | None — easily manipulated | SHA-256 hash for every file
Timestamp Proof | None — file timestamps can be altered | Bitcoin blockchain timestamp (OpenTimestamps)
Authenticity Proof | None | RSA-4096 digital signature
Metadata | Only EXIF data (limited) | URL, browser, TLS certificate, cookies, timestamp
HTML Source Code | Not included | Complete HTML + DOM text
Independent Verification | Not possible | Anytime via Trust Verifier or manually
eIDAS 2 Compliance | Not compliant | Compliant — qualified timestamp
Chain of Custody | Not present | Fully documented and cryptographically secured

#### How do I preserve cyberbullying evidence for a police report?

46% of US teens experience cyberbullying (Pew Research 2022), and evidence is deleted within minutes. To document cyberbullying for police or court: (1) do not alert the bully, (2) open the platform in Chrome, (3) capture every message, post, and profile with a forensic tool. In the US, cyberbullying can constitute criminal harassment or cyberstalking (18 U.S.C. § 2261A). The UK's Online Safety Act 2023, Australia's Online Safety Act 2021, NZ's Harmful Digital Communications Act 2015, and the EU's Digital Services Act all require authenticated evidence. ProofSnap captures the complete web page with SHA-256 hash, digital signature, and blockchain timestamp — creating a forensic evidence package for law enforcement, court proceedings, or school reports. Read the full cyberbullying evidence guide →

#### How do I capture social media evidence for divorce or custody court?

81% of divorce attorneys report a surge in social media evidence in family law cases (AAML). Facebook posts, Instagram stories, and WhatsApp messages can prove hidden assets, lifestyle inconsistencies, or parenting concerns — but screenshots alone are easily challenged. Under FRE 901 in the US, California Evidence Code §1400, Texas Family Evidence Rule 901, and Florida Statute §90.901, digital evidence must be authenticated and unaltered. ProofSnap captures the full web page with SHA-256 hash, RSA-4096 digital signature, and Bitcoin blockchain timestamp — creating a forensic evidence package that meets court standards for divorce proceedings, custody modifications, and spousal support disputes. Read the full divorce evidence guide →

#### Are WhatsApp messages admissible as evidence in court?

WhatsApp messages can be admissible as evidence in court, but authentication is critical. Under FRE 901(b)(1) in the US and similar rules internationally, digital evidence must be authenticated — meaning you must prove the messages are genuine and unaltered. The challenge: it's difficult to prove who actually sent a message, and chat logs can be manipulated or fabricated. ProofSnap solves these problems by capturing the entire chat history with a full-page screenshot, HTML source code, and metadata, then securing it with a SHA-256 hash, RSA-4096 signature, and Bitcoin blockchain timestamp. Particularly relevant for: employment disputes (wrongful termination communications), family law (divorce proceedings, custody disputes), landlord-tenant disputes, and contract disagreements.

#### How do I get a chargeback from Temu, Shein, or AliExpress?

A chargeback (credit card dispute) against Temu, Shein, or AliExpress requires forensic evidence within the 120-day dispute window. Under Visa Reason Code 13.3 (merchandise not as described) and Mastercard Reason Code 4853, you must prove the delivered item differs from the product listing. Document with ProofSnap: the original product page with price and description, the order history, the payment confirmation, and all communication with the seller — each with a blockchain timestamp. Your bank will request supporting evidence: ProofSnap provides tamper-proof, timestamped evidence packages that, according to industry reports, significantly improve chargeback success rates.

## Frequently Asked Questions

#### "Screenshots are barely evidence" — FRE 901 authentication

Under Federal Rules of Evidence 901, digital evidence must be authenticated — shown to be what its proponent claims. Simple screenshots can be easily manipulated and lack metadata proving when they were taken. FRE 902(13)-(14) already permit self-authentication via certified hashes and timestamps. ProofSnap adds exactly this: SHA-256 hash (integrity), RSA-4096 signature (authenticity), and blockchain timestamp (when) — creating a forensic evidence package that meets self-authentication standards.

#### Deepfake laws 2025-2026: UK, EU & US

UK (Feb 2026): Data (Use and Access) Act 2025 — creating a deepfake sexual image is now criminal (up to 6 months imprisonment + unlimited fine), even without sharing. EU (Aug 2026): AI Act Article 50 — mandatory labeling of AI-generated content. US: Proposed Rule 707 for machine-generated evidence (comment period closed Feb 2026). ProofSnap captures deepfake content with cryptographic proof of existence at a specific date — essential for police reports and litigation.

#### Airbnb fines worldwide: NYC $5K-$7.5K — Spain €64M — London £5K+

NYC: Local Law 18 requires platform-verified registration, fines up to $5,000-$7,500 per violation. Spain: €64M fine to Airbnb (Dec 2025), 65,000 illegal listings blocked. London: 90-night rule, £5,000+ fines. EU: Short-Term Rental Regulation from May 2026 — central registration across member states. ProofSnap documents your compliance with timestamped captures: permits, guest communications, booking details — forensic proof for regulatory audits.

#### Chargebacks cost e-commerce $33.79B in 2025

Projected to reach $41.69B by 2028 (Chargeflow). Visa's Compelling Evidence 3.0 allows merchants to block first-party fraud disputes by proving transaction legitimacy. For consumers: Visa 13.3 / Mastercard 4853, 120-day window. ProofSnap captures product pages, checkout flows, and seller communications with blockchain timestamps — forensic evidence that strengthens both merchant representments and consumer disputes.

ProofSnap is a Chrome extension that captures web pages as legal evidence with blockchain timestamping, ensuring the authenticity and integrity of digital evidence.
ProofSnap uses OpenTimestamps to anchor a SHA-256 hash of your evidence to the Bitcoin blockchain, creating a cryptographic proof of when the capture was made. This timestamp is independently verifiable and cannot be backdated or tampered with, providing irrefutable proof that your evidence existed at a specific point in time.
ProofSnap includes a 7-day free trial with all plans. Choose from flexible monthly or annual subscriptions: Essential ($8.99/month or $80/year), Professional ($16.99/month or $160/year), or Enterprise ($24.99/month or $240/year). Annual plans save 20%.

1. screenshot.jpeg: Image file capturing a visual snapshot of the web page.
2. metadata.json: Contains contextual details about the evidence, such as timestamp, URL, and browser information.
3. manifest.json: Lists all evidence files and their hashes to verify the integrity of the package.
4. manifest.sig: Digital signature for the manifest file, ensuring authenticity and integrity.
5. manifest.json.ots: OpenTimestamps proof file for the manifest.json.
6. publickey.pem: Public key used to verify the digital signature of the manifest.
7. evidence.pdf: PDF document compiling all evidence files for easy sharing and review.
8. domtextcontent.txt: Plain text content extracted from the web page's DOM.
9. forensic_log.json: ISO/IEC 27037 forensic log with tamper-evident hash chain recording every capture operation.
10. chain_of_custody.json: Chain of custody document with device integrity, NTP time verification, and evidence binding.
11. page.html: Full HTML content of the captured web page.

To check the integrity of your ZIP archive, upload it to the ProofSnap Trust Verifier and click the Verify manifest button.

1. Unpacking: The ZIP archive is automatically extracted, revealing all included files.
2. Manifest check: The verifier reads `manifest.json`, which lists each file and its expected SHA-256 hash.
3. Hash validation: For every file, ProofSnap computes its SHA-256 hash and compares it to the value in the manifest.
4. Result display: You’ll see a list of files with their validity status:
   - Valid: The file’s hash matches the manifest.
   - Invalid: The file’s hash does not match, indicating possible tampering or corruption.

Note: ProofSnap uses the SHA-256 hashing algorithm, which ensures strong cryptographic integrity for file verification.

To verify the timestamp of your evidence using OpenTimestamps:

1. Extract the ZIP archive: Unzip your ProofSnap ZIP archive to access its contents.
2. Locate files: Find `manifest.json` and `manifest.json.ots` in the extracted folder.
3. Open OpenTimestamps website: Go to https://opentimestamps.org/
4. Upload files: On the website, upload `manifest.json.ots` as the timestamp proof and `manifest.json` as the file to verify.
5. Check verification result: The site will show whether the timestamp is valid and anchored on the Bitcoin blockchain.

Note: OpenTimestamps provides cryptographic proof that your evidence existed at a specific time, independently verifiable on the blockchain.

If you have a ZIP archive from ProofSnap and want to confirm its contents haven't been tampered with, follow these steps. ProofSnap uses the SHA-256 hashing algorithm to ensure file integrity.

1. Extract the ZIP archive: Unzip the file to access its contents.
2. Locate the manifest: Find the `manifest.json` file listing expected SHA-256 hashes for each file.
3. Compute the hash manually:
   - macOS / Linux: Open Terminal and run:
     `shasum -a 256 <filename>`
   - Windows (PowerShell): Open PowerShell and run:
     `Get-FileHash -Path "<filename>" -Algorithm SHA256`
4. Compare the result: Match the computed hash with the one listed in the manifest.
   - If they match: The file is valid.
   - If they differ: The file may be corrupted or altered.

ProofSnap generates forensically sound evidence with cryptographic proofs aligned with eIDAS 2 standards for qualified timestamps and digital signatures. Admissibility depends on jurisdiction and specific legal requirements. Consult with legal professionals for specific cases.

Regular screenshots can be challenged in court because they lack proof of when they were taken and whether they've been altered. Courts increasingly require authentication under rules like FRE 901/902 (US) or equivalent rules in other jurisdictions.

ProofSnap addresses these challenges by creating a forensic evidence package that includes: a SHA-256 cryptographic hash proving the content hasn't been modified, a digital signature for authenticity, a blockchain timestamp proving when the capture occurred, and full metadata (URL, browser info, TLS certificate). This makes your screenshot significantly more defensible than a plain image file.

To preserve a web page as court-ready evidence: install the ProofSnap Chrome extension, navigate to the page you need to capture, and click "Capture page snapshot." ProofSnap automatically captures the full-page screenshot, all visible and hidden text, page HTML, metadata, and session data. Everything is bundled into a tamper-evident ZIP archive with cryptographic hashes, a digital signature, and a blockchain timestamp.

This approach is superior to simply saving a PDF or taking a screenshot because it creates a chain of custody with independently verifiable cryptographic proofs. The evidence package can be verified by anyone using the ProofSnap Trust Verifier or by manually checking the SHA-256 hashes and OpenTimestamps blockchain proof.

ProofSnap is optimized for capturing social media and messaging platforms as legal evidence. It supports WhatsApp Web, Messenger, Instagram, Telegram, Discord, Slack, LinkedIn, X (Twitter), Reddit, and Airbnb.

For messaging apps, use the "Full chat capture" option to document an entire conversation history into a single verified file, or use "Capture visible area only" for a specific message or post. ProofSnap captures the content before it can be deleted or edited, and timestamps it on the blockchain so you can prove the messages existed at that point in time.

This is particularly useful for harassment evidence, contract disputes, defamation cases, employment disputes, or any situation where social media content may be deleted.

ProofSnap enables Airbnb hosts to archive all guest communications as legally admissible evidence. Capture messages, reservations, and agreements for disputes, insurance claims, or guest-caused damages.

With regulations like the Digital Services Act (DSA) and updated tax obligations for short-term rental providers, hosts have increasing requirements to maintain records of reservations and communications.

ProofSnap creates a verifiable archive with blockchain timestamp proving communication content at a specific time — ideal for:

- Property condition disputes before/after stays
- Insurance claims and guest-caused damages
- Guest complaints and refund requests
- Documenting contractual terms and agreements

When documenting online harassment, cyberbullying, threats, or defamation, it's critical to preserve the evidence before the perpetrator deletes it. ProofSnap captures the complete web page including the harasser's profile, the offending content, timestamps, and all technical metadata (URL, browser info, session data).

Each capture is protected with a blockchain timestamp and cryptographic hash, creating an evidence package that proves:

- The content existed at a specific date and time
- The evidence has not been altered since capture
- The exact URL and source of the content

This evidence package can be submitted to law enforcement, included in a police report, or presented in court proceedings for cyberbullying, stalking, threats, or defamation cases. See our complete cyberbullying evidence guide for step-by-step instructions covering WhatsApp, Instagram, Discord, TikTok, and more.

Online content can disappear at any time — posts get deleted, pages get edited, accounts get removed. ProofSnap lets you instantly "freeze" any web page into a tamper-evident evidence package before the content vanishes.

Simply navigate to the page and click capture. ProofSnap saves everything: the full screenshot, the complete HTML source, all visible text content, metadata, and session data. The blockchain timestamp proves exactly when you made the capture, so even if the original content is deleted, you have an independently verifiable record.

This is essential for litigation holds, preserving defamatory content, documenting fraudulent offers, saving terms and conditions before they change, or any situation where you need proof of what a website showed at a specific point in time.

ProofSnap uses three layers of cryptographic protection:

1. SHA-256 Hashing: Every file in the evidence package is hashed. Changing even a single pixel or character produces a completely different hash, making any tampering immediately detectable.
2. Digital Signature: The manifest (listing all files and their hashes) is digitally signed with a private key. The corresponding public key is included for anyone to verify authenticity.
3. Blockchain Timestamp: The manifest hash is anchored to the Bitcoin blockchain via OpenTimestamps, creating an immutable record of when the evidence was captured. This timestamp cannot be forged or backdated.

Together, these mechanisms create a chain of integrity that proves the evidence is authentic, unaltered, and was captured at a specific point in time.

A chain of custody is the documented chronological history of evidence handling — from the moment it's captured until it's presented in court. For digital evidence, this includes proving who captured the content, when it was captured, and that it has not been altered since.

Under FRE 901/902 (US Federal Rules of Evidence) and equivalent rules in other jurisdictions, digital evidence must be authenticated to be admissible. ProofSnap establishes a cryptographic chain of custody by: generating a SHA-256 hash (any modification breaks the hash), applying an RSA-4096 digital signature (proves the evidence was created by ProofSnap), and anchoring the hash to the Bitcoin blockchain via OpenTimestamps (proves the exact capture time). This chain of custody is independently verifiable by anyone, including opposing counsel, judges, and forensic experts.

The eIDAS 2 regulation (EU 2024/1183) is fully rolling out by the end of 2026, establishing stricter standards for electronic identification, digital signatures, and qualified electronic timestamps across all EU member states.

Under Article 41, qualified electronic timestamps enjoy a legal presumption of accuracy for the date and time they indicate, and the integrity of the data to which the timestamp is linked. This means evidence timestamped with a qualified service is admissible across all EU courts.

ProofSnap's cryptographic proofs align with eIDAS 2 requirements: SHA-256 hashing for data integrity, RSA-4096 digital signatures for authenticity, and blockchain timestamps via OpenTimestamps for independent time verification. This makes ProofSnap evidence packages suitable for legal proceedings in any EU jurisdiction.

Unlike enterprise-only tools like Page Vault, PageFreezer, or WebPreserver, ProofSnap is a self-service Chrome extension that anyone can install and use immediately. Key differences:

- Instant access: Install from the Chrome Web Store and start capturing in seconds — no sales calls, setup, or enterprise contracts required
- Blockchain timestamping: ProofSnap anchors evidence to the Bitcoin blockchain via OpenTimestamps, providing an immutable, publicly verifiable timestamp that doesn't depend on any single vendor
- Platform-optimized capture: Built-in support for WhatsApp, Slack, Discord, Telegram, LinkedIn, Airbnb, and other dynamic platforms with full-page scroll capture
- Affordable pricing: Plans start at $8.99/month with a 7-day free trial — a fraction of enterprise tool costs
- Complete evidence package: Every capture includes 11 files — screenshot, HTML, extracted text, metadata, forensic log, chain of custody, cryptographic hashes, digital signature, blockchain timestamp proof, and a PDF summary

ProofSnap is optimized for capturing LinkedIn profiles as verified, timestamped evidence. This is essential for:

- HR & recruitment: Verify candidate claims, document fake profiles, prevent resume fraud
- Employment disputes: Capture employee profiles, endorsements, or posts relevant to workplace disputes
- Visa processing: Archive professional profiles as part of employment validation documentation
- Defamation cases: Preserve defamatory posts or comments before they're edited or deleted

Simply navigate to the LinkedIn profile or post, click the ProofSnap extension, and download the complete evidence package. The blockchain timestamp proves the profile content existed at that exact moment — which is critical when profiles can be edited or deactivated at any time.

WhatsApp messages can be admissible as evidence in court, but authentication is critical. Under FRE 901(b)(1) in the US and similar rules internationally, digital evidence must be authenticated — meaning you must prove the messages are genuine and unaltered.

ProofSnap captures the entire WhatsApp Web chat history with a full-page screenshot, HTML source code, and metadata, then secures it with a SHA-256 hash, RSA-4096 digital signature, and Bitcoin blockchain timestamp. This creates a forensic evidence package that is significantly more defensible than simple screenshots. Particularly relevant for: employment disputes (wrongful termination communications), family law (divorce, custody), landlord-tenant disputes, and contract disagreements.

A chargeback (credit card dispute) against Temu, Shein, or AliExpress requires forensic evidence within the 120-day dispute window. Under Visa Reason Code 13.3 (merchandise not as described) and Mastercard Reason Code 4853, you must prove the delivered item differs from the product listing.

Use ProofSnap to document: the original product page with price and description, the order history, the payment confirmation, and all communication with the seller — each capture secured with a blockchain timestamp. Your bank will request supporting evidence: ProofSnap provides tamper-proof, timestamped evidence packages that significantly improve chargeback success rates.

## Contact Us

Have questions about ProofSnap or need a business solution? Get in touch with our team.

First Name
Last Name
Email
Company
Message

Or contact us directly at support@getproofsnap.com

## Key Terms Explained

Understanding the technology behind tamper-proof digital evidence

###
Blockchain Timestamping

A cryptographic method that anchors a hash of your evidence to the Bitcoin blockchain, creating an immutable record proving exactly when the content was captured. This timestamp cannot be forged, backdated, or altered, providing court-admissible proof of existence at a specific point in time.

###
SHA-256 Hash

A cryptographic fingerprint that uniquely identifies file content. SHA-256 (Secure Hash Algorithm 256-bit) generates a 64-character hexadecimal string from any data. Changing even a single pixel or character produces a completely different hash, making any tampering immediately detectable.

###
Digital Signature

An RSA-4096 cryptographic signature that proves the evidence package was created by ProofSnap and has not been modified. The manifest file is signed with a private key, and anyone can verify authenticity using the included public key (publickey.pem).

###
Evidence Package

A comprehensive ZIP archive containing all forensic evidence: screenshot, full HTML, extracted text, metadata (URL, timestamp, browser info, TLS certificate), cryptographic hashes in manifest.json, digital signature (manifest.sig), blockchain timestamp proof (.ots file), and a human-readable PDF summary.

###
OpenTimestamps

An open-source protocol for creating blockchain timestamps. OpenTimestamps aggregates multiple document hashes into a single Bitcoin transaction, making timestamping cost-effective while maintaining full cryptographic security. Timestamps can be independently verified by anyone using the OpenTimestamps.org website or CLI tools.

###
eIDAS 2 Compliance

The EU regulation (Electronic Identification, Authentication and Trust Services) establishing standards for electronic signatures, timestamps, and digital evidence. ProofSnap's cryptographic proofs align with eIDAS 2 requirements for qualified electronic timestamps, making evidence packages suitable for legal proceedings across EU member states.

###
Cryptographic Hash

A mathematical algorithm that converts data of any size into a fixed-size string of characters. Used to verify data integrity — if even one bit of the original data changes, the hash will be completely different. ProofSnap uses SHA-256, a 256-bit hash function that produces a unique 64-character hexadecimal fingerprint for every file in the evidence package.

###
Chain of Custody

The documented chronological history of evidence handling, from collection to presentation in court. For digital evidence, chain of custody includes cryptographic proofs (SHA-256 hashes), timestamps (blockchain anchoring via OpenTimestamps), and digital signatures (RSA-4096) that verify evidence has not been altered since capture. Required under FRE 901/902 (US) and eIDAS 2 (EU) for evidence admissibility.