Certificate of authenticity · Verification code 69MEKYTBYF · Version 1
Hermetik VII
Tim Berresheim
| Inventory number | TB05/E 4/1 |
|---|---|
| Year | 2005 |
| Technique | Linolschnitt |
| Dimensions | 70 × 50 cm |
| Edition | 1/10 |
| 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
f6bd400f8f5896211563b10e138b90cb75912ba05fd5814e8db019aab09fffc8- Signature (Ed25519, Base64)
h/ArfUY190UfVU4CrKI6t3QoJOIQ+K4NCclb/sSkO2W6Er54hU2skQwrJPi5GenGS+VPFBurUPiZII2XOgn4Dw==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
d0ba385b08fa1e036c71e5a524e382c88ff1052c3c168c4912782a3de6c68d9b
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.