Certificate of authenticity · Verification code 2A3ECMU7CB · Version 1
brandelli di nuvole V
Tim Berresheim
| Inventory number | TB14/E 44 |
|---|---|
| Year | 2014 |
| Technique | Risographie |
| Dimensions | 44 × 31 cm |
| Edition | 40 |
| Issued | 10.11.2026, 06:32 |
Verify this work
A numbered security seal on the back shows whether a work belongs to this certificate. No seal has been registered for this work yet. Write to us and we will check it for you.
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
1bf69ee021a9a866203bef48e70ed105396168f3fa9b9db9b023d254e459ca5e- Signature (Ed25519, Base64)
yvONWg1SS/U9o9WBqIzvArclaYnS1rbMmMzn1lMIm3C34pPUO/l84q5PL2zRXl0rxLyyEEjhzrA0j/+zoXErBA==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
c466892e958a8b1b8680c9b698191911ce6ae0498ec62ae6249821d4f906f233
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.