Certificate of authenticity · Verification code Y8LT2PFEHP · Version 1
Lemon Law IV (AEI23) - Revisited
Tim Berresheim
| Inventory number | TB19/F 251/2 |
|---|---|
| Year | 2019 |
| Technique | Archival Print auf Fine-Art-Papier |
| Dimensions | 60 × 50 cm |
| Edition | 2/10 |
| Issued | 13.11.2026, 08:05 |
Timestamp anchored in Bitcoin, block 975648.
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
1858e731fc507e8434b510f994e79c57e843bfebf6735a13371571479249bbbd- Signature (Ed25519, Base64)
S4PUhtCjMhANjID4a7Zhh4jxfy79vFUdQR5s/kDuOiePRq7dbREsHj9+gfkSsM1cXFuP5YjSqfS7v8pJYAHbBw==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
b080836bbc6df96e5477bc28fd58d80ed741a355e3aab08b0c85f4850edc805c
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.