Certificate of authenticity · Verification code 8SK8FTFKJ8 · Version 1
Danish Blue 1
Tim Berresheim
| Inventory number | TB04/M 14 |
|---|---|
| Year | 2004 |
| Technique | Harz und Pigmente auf Leinwand |
| Dimensions | 200 × 180 cm |
| Edition | unique |
| Issued | 13.11.2026, 08:07 |
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
5ee74b1422a32b23882e4977abffef67f166775dd2e978376ace229a709eac39- Signature (Ed25519, Base64)
3udCghb3GZtCYIdnMgjOD7y1wFF6oJTOZvCJXqA49QKKhae6YrTsp2oxVvZXlx8aF1ZJ11rz/3hGlot+mjzpCg==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
f9cc55f5f3d814a9a96ae9b7a32cee5247c1d78921123f08963e6a211b6ab412
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.