ProofSnap is a browser extension, server-side API and AI-assistant integration that seals web pages, chats, and files into forensic evidence packages for use in litigation, investigations, and compliance proceedings.

Key features and functions include:

Browser Extension Capture
The Chrome and Edge extension reloads the active tab to record the server response fresh, then collects a full-page screenshot, HTML source, extracted text, and page metadata. Pages that load content on scroll, including platforms such as WhatsApp Web, Telegram, Slack, Discord, Messenger, LinkedIn, and Airbnb, are captured section by section.

Server-Side API and Dashboard
Pages can also be captured on ProofSnap’s own servers rather than the user’s browser, producing a consistent capture environment that is recorded in the package. The API and dashboard support single and batch captures, scheduled captures and change monitoring, comparison of two captures, redaction, and import of existing packages. Legal plans add matter workspaces with a hashed custody log, legal hold, and Bates-numbered exports with Concordance and Opticon load files.

Cryptographic Integrity and Time Anchoring
Every file in a capture is hashed with SHA-256, and the manifest is signed with an RSA-4096 key; capture time is checked against NTP servers. Depending on plan, a package can add a Bitcoin blockchain timestamp via OpenTimestamps, an EU qualified electronic timestamp under the eIDAS Regulation issued by Disig a.s. (a qualified trust service provider on the EU Trusted List), and a C2PA Content Credentials manifest on the screenshot.

Multi-Tab and Video Capture
Additional capture modes cover video recording of a browsing session, multi-tab sessions that bundle a separate forensic package per tab, and certification of files already on a user’s device by hash alone.

Forensic Mode
Available on Professional-tier plans and above, forensic mode adds an archive of the page’s network layer: an HTTP log (HAR), a WARC file, every loaded resource with its own hash, and the TLS connection and certificate details of the site.

AI Assistant Integration
A remote MCP server with OAuth lets AI assistants, including Claude, ChatGPT, and others, start captures, read sealed page text, verify packages, and build case matters, within the permissions the user grants. Webhooks, a Zapier integration, and an OpenAPI 3 specification are also available for connecting the API to other systems.

US Filing Support
For US proceedings, a pre-filled FRE 902(13)/(14) self-authentication declaration template can be added to a package for a qualified person to complete and sign.

Independent Verification
Every package includes offline verification scripts for Windows, macOS, and Linux. A free web-based Trust Verifier and an open-source, MIT-licensed command-line verifier are also available, so packages can be checked without the vendor’s continued participation.