Certificate of authenticity · Verification code 4VGP69JWZP · Version 1
Lemon Law II (AEI23) - Revisited
Tim Berresheim
| Inventory number | TB19/F 250/1 |
|---|---|
| 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
33f19f16a4f487c7b766f75856cae6755ce5de5b88ac929c68900423b922d46f- Signature (Ed25519, Base64)
fKTzMYHFDpyeguHng2cJeOY1nv9F37xJOadbgMEXEed0COjdKpFLbH5vlhNGBAflk5KOmBcoqV7B1DUeetvtBg==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
a2aca9906f89cc2a1cad9ca0b6b2bf62d784297cfb0b669a8ade725cba0f9a3a
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.