Certificate of authenticity · Verification code SKVHLYMYWQ · Version 1
Hermetical Cascade II
Tim Berresheim
| Inventory number | TB05/M 29 |
|---|---|
| Year | 2005 |
| Technique | Harz und Pigmente auf Leinwand |
| Dimensions | 160 × 250 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
33c6b0657ccd958c087e6de3fc8082073d075a73824cfeece4d20f27da1d5581- Signature (Ed25519, Base64)
KE3vVkj6Qq+HZb0yyJVzisG2vVtcRwfbieGaZb8rLLbETxMqJVTbzXysgooWSTvBm2A4cX6oKytMZ1pWvifoBg==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
edd31038fc16abc5caf29342700157e48fdada31267e52e14507b4d8a25a9b32
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.