Certificate of authenticity · Verification code D9GEEQVBC4 · Version 1
Mr. Real Good Lemon
Tim Berresheim
| Inventory number | TB18/P 174/1 |
|---|---|
| Year | 2018 |
| Technique | Harz und Pigmente auf Papier |
| Dimensions | 95 × 130 cm |
| Edition | 1/2 |
| Issued | 13.11.2026, 08:06 |
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
77271f2e1600a5acc1119e1d4e7b4a92a0f4604e5aa52a5af4d5365003215bde- Signature (Ed25519, Base64)
Fgo1EGs0HjNkTpVJwJigsuu51Z9SVDOs6rOzm09TeOj3e7V+mYxxGeDHJ7S33MTmKKRrhQ9qW8kWn9YwhUvvDA==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
c4c42d3be2827664d7b92056e86ded553951837267ff8a0da421e98bc505edc3
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.