Certificate of authenticity · Verification code 66SJ78XFTS · Version 1
La fenice guarda al Medioevo
Tim Berresheim
| Inventory number | TB22/F 386 |
|---|---|
| Year | 2022 |
| Technique | Baryt |
| Dimensions | 50 × 60 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
e0877cf9146dd9dd46e21a9668d000e18c94c8de8c1f6fa0898df1bfbe034b6b- Signature (Ed25519, Base64)
RhDhJ+gvcYaq0eRYkFJyp20GlWvYFwY5z+hGgomPpaS4Qn1zBk2R98HHvAM9cL7UAk+MbEdlS1RBw2SS1JdBAw==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
4be768406edfa58be2a28893271adfbf7d2d5a6598d88d002911dface3266a18
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.