Radim Motycka
Founder and Lead Engineer, ProofSnap
- Blockchain engineer
- eIDAS qualified timestamps
- Digital evidence
Radim Motycka founded ProofSnap in 2026 and is its lead engineer. ProofSnap is the Chrome and Edge extension that captures web pages as digital evidence, and Radim designs its evidence package: SHA-256 hashes, an RSA-4096 signature, an OpenTimestamps anchor on Bitcoin and an eIDAS qualified timestamp from Disig a.s.
About Radim Motycka
I am the founder and lead engineer of ProofSnap, and I have worked on cryptographic protocols for more than ten years. I built ProofSnap because a screenshot with no hash, no trustworthy timestamp and no chain of custody is easy to challenge, and generative AI makes the challenge easier still.
Every ProofSnap capture produces a package of 11 to 15 files, depending on the plan: the screenshot, the HTML page, the metadata, SHA-256 hashes and a manifest signed with RSA-4096. Every plan except Essential adds an OpenTimestamps anchor; the Enterprise and Company plans and the eIDAS and Video SnapPacks add a qualified timestamp from Disig a.s., a qualified trust service provider on the EU Trusted List.
The rule I design by: whoever receives the package should not have to trust ProofSnap. That is why the anchor goes on Bitcoin rather than on a blockchain I control, why an independent provider issues the qualified timestamp, and why every package contains the scripts to verify it without going through us.
Areas of expertise
Timestamping
OpenTimestamps anchoring on Bitcoin and RFC 3161 qualified timestamps from Disig a.s.
Cryptography
SHA-256 hashes, RSA-4096 signatures, X.509 certificates.
Chrome and Edge extensions
Manifest V3, full-page capture, LinkedIn profiles and chats on platforms such as WhatsApp, Telegram, Discord and Slack.
Provenance and chain of custody
C2PA Content Credentials, a forensic log with a hash chain, and the free Trust Verifier for checking packages.
Why a qualified timestamp
"A qualified electronic time stamp shall enjoy the presumption of the accuracy of the date and the time it indicates and the integrity of the data to which the date and time are bound."
Article 41(2), Regulation (EU) No 910/2014 (eIDAS)
This provision is why ProofSnap obtains its qualified timestamps from Disig a.s. instead of issuing them itself: the presumption attaches to the timestamp of the qualified provider, not to the software that requested it.
Frequently asked questions
Who is Radim Motycka?
He is the founder and lead engineer of ProofSnap, the Chrome and Edge extension that captures web pages as digital evidence. He has worked on cryptographic protocols for more than ten years and designs the format of the evidence package.
What is a qualified trust service provider?
An organization that, after a conformity assessment, appears on the EU Trusted List and may provide qualified trust services, such as issuing qualified timestamps. ProofSnap uses Disig a.s.
What is OpenTimestamps?
An open protocol created by Peter Todd that anchors a SHA-256 hash in the Bitcoin blockchain. It shows that the file existed no later than the date of that block. ProofSnap uses it on every plan except Essential.
How do I verify a ProofSnap package?
Use the free Trust Verifier on our website (no account needed), or run the verify.sh and verify.ps1 scripts included in every package.
Create your evidence package
SHA-256 hashes, an RSA-4096 signature and a timestamp in one ZIP file. 7-day free trial. A credit or debit card is required.