Certificate of authenticity · Verification code NPSHUB8SYQ · Version 1
Lemon Law I (AEI23) - Revisited
Tim Berresheim
| Inventory number | TB19/F 249/1 |
|---|---|
| Year | 2019 |
| Technique | Archival Print auf Fine-Art-Papier |
| Dimensions | 60 × 50 cm |
| Edition | 1/10 |
| 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
29868729a320862eb1c06754e8c93451c60fec54bd31e35a7f54da0fecfef3b1- Signature (Ed25519, Base64)
T9ABMalU39Iny5BB9FhQUZ2VDWLRcg7ObuFIp5JOd6dK89KDLVMOoCriXRKQTVPIUnWXRRfUEjLjh1ilpkvgDA==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
9be049e3e9a30b17842496d46a409d400e8754942347d3311c82610f2015fcc6
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.