Certificate of authenticity · Verification code S8RF72FXQU · Version 1
Übung im Lauern V
Tim Berresheim
| Inventory number | TB17/P 112/1 |
|---|---|
| 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
f49849f1f099d76bf462edf41015af1e9db829e0bbd1a9701e420ca56790c65b- Signature (Ed25519, Base64)
8gYUWd6o5erAjyuzRVVvzlNlrEvp/vPwsN1q3Wfqf6cTdCQ4LjzQq2P+Xv41lJlBR3A93zPIH8CrPshOfMr1BQ==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
e8486d365b592f6861ca09885be84f5c32941f6fc1b60d32b65dc6a95ba1fada
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.