Kolaboro / Verify evidence
Check that a photo or document from a Kolaboro report is genuine.
Your browser fingerprints the file locally. If it matches our public timestamp record, you get a proof anchored in Bitcoin that you can check independently.
Live · anchored in Bitcoin
Verify a piece of evidence yourself
Drop any photo or document from a Kolaboro report. Your browser computes its SHA-256 fingerprint; the file never leaves your device. We look the fingerprint up in our public timestamp record and give you the OpenTimestamps proof, which you can check with free, independent tools.
How it works: each fingerprint is submitted to independent OpenTimestamps calendars (run by the OpenTimestamps project and Eternity Wall). They aggregate it into a Bitcoin transaction within hours. After that, nobody, including us, can backdate or alter the evidence without it showing.