Certificate of authenticity · Verification code EQ9WC9YWAL · Version 1
Don ́t call us piggy - call us cum IV
Tim Berresheim
| Inventory number | TB04/M 264 |
|---|---|
| Year | 2004 |
| Technique | Harz und Pigmente auf Leinwand |
| Dimensions | 200 × 180 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
7896707c9793ecfdfc90f4f27a3dca39175a5f8bfe5ccf2158bf97afc43ebe58- Signature (Ed25519, Base64)
gz5pzVk3QLyeh1a9ntb3MQcqin2j+e62zKHxxs1RzKxpGxnwPDI8WlYNLRDHnJ6motOb+LmgF/b+A9w6rPoRCQ==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
5c705b5ef016781e1fa5269e1c92b0d61de3dc8dd9ab6a2a4b23e2d5fc5dede0
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.