Certificate of authenticity · Verification code T486MWPMGW · Version 1
brandelli di nuvole I
Tim Berresheim
| Inventory number | TB14/E 40 |
|---|---|
| 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
cc12967f9b2e8d7164e2d13eb913a8c656cda0a9251f35cd86e7b49208f22166- Signature (Ed25519, Base64)
Mw0axr1xcHut5Ws50xrZTixUzUrguJpGJPrak86DzQiVCxuyZBGDcCSNms+yJybjL2a4yJvyz5y7Fafk1MeYBA==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
4b3210351f6b1196d1f5a6bff57a3d06daf9b9965206b0ea6031e57d94684f5c
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.