Certificate of authenticity · Verification code JLAVKS8BRW · Version 1
La Clairière - Ivresse et le bâton - Anaglyph
Tim Berresheim
| Inventory number | TB19/F 242/1 |
|---|---|
| Year | 2019 |
| Technique | Baryt |
| Dimensions | 60 × 50 cm |
| Edition | 1/3 + 1AP |
| 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
40be638363b00b37a8f454059272bebf81ef0e73b7d4b873e0ecc2c43eec9d32- Signature (Ed25519, Base64)
H+qebvxarySzfZK+k3s4gZfsWLUZm1SFu9ncH0jTXiP9kPoTfemHYlgIQez69RBSgb8kcdqblQQ58QtbGt0QCg==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
9d1a556f7238d2b8dfee8f2d1a7d56655c5041f29474c7931c3ca0c996b87b35
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.