Certificate of authenticity · Verification code RNR8BBMEXP · Version 1
Don ́t call us piggy - call us cum VII
Tim Berresheim
| Inventory number | TB04/F 2 |
|---|---|
| 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
48c7015b29e9c8c4ba6462dad438c49815b0585b6050536587b61a258e45a15f- Signature (Ed25519, Base64)
XzTD7Eg7fTFx1cy7mIbuYBSqdb6Idh25CAjjmLXGsY6gxvySXxlfpikMxypE6D1umFbwc0nl1OCY887JJiMBDA==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
e691777cee863b079981ae763980244a3fb5b58b1973ff838a9142ab2099b1e8
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.