Certificate of authenticity · Verification code HBVWT8RMKU · Version 1
Balken (ambiguity) Family
Tim Berresheim
| Inventory number | TB16/E 48/1 |
|---|---|
| Year | 2016 |
| Technique | Radierung |
| Dimensions | 20 × 14 cm |
| Edition | 1/7 |
| 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
035e1e2d664d8b8938c456a1ef08ac11b7f31c1877093eab6c79b40e7ee9ec6f- Signature (Ed25519, Base64)
d/c+Lzw8K1KHIvr+s5Qubxx7sy0UxUtgKxTJJ/y9+RyTY+Sj9ZOKLyWCPQH+4Trhe8uWEipDdTXUhRYy27I1AQ==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
d7cd82c9fb4f07894cc3b6ec098d0aa8be987a83b2eb4173fd1f0b53cf82215b
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.