Certificate of authenticity · Verification code ZLERTKWY6N · Version 1
Sleep Walk Carte-Vue II
Tim Berresheim
| Inventory number | TB19/P 222 |
|---|---|
| Year | 2019 |
| Technique | Harz und Pigmente auf Papier |
| Dimensions | 110 × 90 cm |
| Edition | unique |
| Issued | 10.11.2026, 06:32 |
Timestamp anchored in Bitcoin, block 975269.
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
ca252f89dcf6f2748a40e5680e9f68ace676941023aadf4a9d52e26aee605fbd- Signature (Ed25519, Base64)
NWrnpgGRfM54K4+JuzaIjPQ4UWB1nBzCcNQS51aqbOiFEiY2AC9NXNJHoKGtURdb+v28cXgfrNV8lii5waCrCg==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
3ff995d80a1f5570805af5775ef0a89c33ce121c18fc3a930773ab82c51052e3
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.