Certificate of authenticity · Verification code Q3K5XN6YYZ · Version 1
Don ́t call us piggy - call us cum VI
Tim Berresheim
| Inventory number | TB04/F 1 |
|---|---|
| Year | 2004 |
| Technique | Foto |
| Dimensions | 180 × 120 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
a8bef90509baa6670eb9768bff751ec3875dc4f10fbacbbdb78c09d224a7c6e9- Signature (Ed25519, Base64)
o2YjWmVOYIftYi4h5t46kBO8ne2recXW5T1jzoKjTjgYoQYfoP4SXnQGz25ap6Qq+H10hiL1Yjy/UibgV4LVDA==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
8fdbed0b54cc95565ebd199a8fac1dfd3869a34bad11636a01f7f66aaff33459
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.