Certificate of authenticity · Verification code FDSG6YE9CJ · Version 1
Tabak Jurewicz - (Kohärentes Licht) II
Tim Berresheim
| Inventory number | TB19/F 256 |
|---|---|
| Year | 2019 |
| Technique | C Print (Chromogendruck) |
| Dimensions | 50 × 200 cm |
| Edition | unique |
| Issued | 10.11.2026, 06:32 |
Timestamp anchored in Bitcoin, block 975269.
Verification
- …Checksum of the certificate file
- …Artist’s signature
- …Timestamp in Bitcoin
- ·ImageDrop the image file here to compare it with the certificate.
Drop a file here: image, certificate (.json), signature (.sig) or timestamp (.ots). Nothing is uploaded; everything is computed in your browser.
Verification data
- SHA-256 of the certificate file
92d9ec08c0dc522ca32236eb9bbc92ac683e887d3c0f7eae681fde9675158bae- Signature (Ed25519, Base64)
VApPkaTO7flTi8GzP7SVMoZB1jcKeMp8pxfe9ZMrzR5W0vLXiddiVz8L/SrtmhASGtdyp4kOvVoMfcdAl2lhCA==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
c3310fb775eb61e90646d17289f2b368b92967d8de9bc3b89eee22270d7528f9
How to verify this independently of this page: hash the JSON file with SHA-256; the value must match the checksum above. Verify the signature against that checksum with the public key (Ed25519). Check the .ots file together with the JSON file at opentimestamps.org: this proves since when the checksum has been in the Bitcoin blockchain. The proof depends neither on this address nor on the artist, only on certificate, key and blockchain.