Certificate of authenticity · Verification code P8FGKDZ95B · Version 1
Not Yet Titled
Tim Berresheim
| Inventory number | TB20/F 279 |
|---|---|
| Year | 2020 |
| Technique | C Print (Chromogendruck) |
| Dimensions | 170 × 220 cm |
| Edition | unique |
| Issued | 13.11.2026, 08:05 |
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
d3c3a6e7a399ad864881caad3758b3d20d2eee2f1b31d520ac49d6392b7cacf1- Signature (Ed25519, Base64)
vgyYYl6OktRNNdSPjBC1F4P+8DJaBRQAiTG2SQ/damodhRPFSq2m/Ok3+Q7FwM21wN8mCMFCOMFjRhzPUpGsBg==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
1a9b7df8c8aa1bcea3fc25b66be9ba5e65a297711d603415f759854974da23d7
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.