Certificate of authenticity · Verification code X2S4W5C6JU · Version 1
HERE AND NOW V
Tim Berresheim
| Inventory number | TB09/F 114 |
|---|---|
| Year | 2009 |
| Technique | Face-Mount Archival Pigment Print hinter Acrylglas, rückseitig auf Aluminium kaschiert, gerahmt. |
| Dimensions | 150 × 100 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
e51582b97d72a6b0f4d11a2456538eff3519ea27604388ec9922881529fefa82- Signature (Ed25519, Base64)
e5bOlJ6TzsJnnaFME8iL7CCU3jpjJTUjtCBi/6nvxLaPLHJoKhscAvNbnNJftkkraWfqlzHkJrohPzmWyx/PAA==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
5a250c951618c18598325448dfcb61f2ffc3104b9a974d9433051733ab0ffcd6
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.