Certificate of authenticity · Verification code DRAK3YNM87 · Version 1
Übung im Lauern III
Tim Berresheim
| Inventory number | TB17/P 110/1 |
|---|---|
| Year | 2017 |
| Technique | Harz und Pigmente auf Papier |
| Dimensions | 50 × 45 cm |
| Edition | 1/3 |
| Issued | 13.11.2026, 08:06 |
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
4c9fd40b69fcea09e24419f9c98d3540112ed41ba992cd96a9f41cc066e69b90- Signature (Ed25519, Base64)
8nU+4a00GVDa4Sz9XF9hflaszb9SgKa4ST3nblwl18AmwXIjjeEPs9h7vvNMD5hvGMcIOE3WQ0KvSkOjxmZzCA==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
57e05fa456675da6e8b2164e1d9ac74feb6136c1b972ce84a331d38a539e4a59
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.