Certificate of authenticity · Verification code N236B789HJ · Version 1
brandelli di nuvole IV
Tim Berresheim
| Inventory number | TB14/E 43 |
|---|---|
| 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
fa4384c6c2c5acfdd22aaa59d7a7e4695229506c52fccebff16617179788da36- Signature (Ed25519, Base64)
Z1ldYWYLwGBKPzQ9XZa7yzYNL56fQycsRX+z7nfT6t7NkQ636nJpIdD87Q+dTsIqaZ61D49I5RcwYregz1KNCQ==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
888da6d890bf0ca30049a9f055afabba7fdd03529437cc1eae02a84921ca2841
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.