Certificate of authenticity · Verification code A9F27WGQ99 · Version 1
brandelli di nuvole III
Tim Berresheim
| Inventory number | TB14/E 42 |
|---|---|
| Year | 2014 |
| Technique | Risographie |
| Dimensions | 44 × 31 cm |
| Edition | 40 |
| 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
d2d86184c0d561b5913d3f0aaedc34015ade56eb02dce631c3b890961d44e00d- Signature (Ed25519, Base64)
kVUks9cHqk53eUJeEuoRmMGQbu5y2bMj3x8Aw126pQSyiTyizcebVKm9rXJ3b8Z0zr0KvDJFt9aa33e5yxVmCw==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
a549ac28070cba7e1442cebe18f7d841c07cab370bb00a7c916880c8b1c24ee2
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.