Certificate of authenticity · Verification code WWMNW56V7L · Version 1
Hermetik XII
Tim Berresheim
| Inventory number | TB05/M 22 |
|---|---|
| Year | 2005 |
| Technique | Harz und Pigmente auf Leinwand |
| Dimensions | 250 × 400 cm |
| Edition | unique |
| 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
95f13c76c2f81f01a3fd46f256a234a5aa542874ace3a59510a5dd20434001f4- Signature (Ed25519, Base64)
8Lztjzq2OvPLofWWGLzsAUcewyXDS87cOXWVN3njKBIFIx2bukk7YDCbSxj86fEYwdt30rzz+uix6VZjNrBiDQ==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
cf4402f9306ae331b8121c2af48be1acde2bc50071dbd604d2b499be503624a3
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.