Certificate of authenticity · Verification code 6NQ5Z4325Z · Version 1
Danish Blue 5
Tim Berresheim
| Inventory number | TB04/M 18 |
|---|---|
| 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
0d08614c0bd56626a076091368d734f27a4baf43ee223e6b559fda1df1e5dbf3- Signature (Ed25519, Base64)
mXratXcJtdiRFqtAYjxWUXImfgDM5Thohd6xB/8kxjWktx9o4vr7YqBYL8eqefbdRQh1euirEK2XWi5wiVTrCA==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
9c82be084c93cc8fc767d1be5439da0759b5ac6b8a01a777bb8b76493ee3fea9
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.