Certificate of authenticity · Verification code 9WWTYB6YQU · Version 1
Debitage Geierknochenflöte Bad Aachen
Tim Berresheim
| Inventory number | TB24/M 163 |
|---|---|
| Year | 2024 |
| Technique | Harz und Pigmente auf Leinwand |
| Dimensions | 400 × 250 cm |
| Edition | unique |
| 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
c7967e344f22cdc7d7c76403a4b9624636e6f885af2341b7fdfb39e90cc165b8- Signature (Ed25519, Base64)
0uo33O49xcy9TDKYqXJ2GFJ9uyrDY1HR5UVN3TelVwa8ZRVVHVL03wXb65FYx1MuLUcuKm+Z8LN8qC14Ewf6Bw==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
c67d20c5efcb5e1dd40cc617a06733df8765ce051b5fc8a6ccd1f9bbb603586d
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.