Certificate of authenticity · Verification code XB9FD2MJA4 · Version 1
Immediatamente disponibile. L'insegnante di flauto
Tim Berresheim
| Inventory number | TB22/F 377 |
|---|---|
| Year | 2022 |
| Technique | Baryt |
| Dimensions | 60 × 50 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
68cf3b1132c8e51d47e10594fda468096c424c7cbb5133336a86eaf5aa232a63- Signature (Ed25519, Base64)
MkeIGc/A1NwfSm2HLEen/BiR29/3XSW6J7GrltrDr1PskfePIbKhuJjC4jRcoCaB1tTNzUUKBa1Qye8kF5q2CA==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
645bfe337cb3c80e0a94c55544e7e476eaab4926f1b578d452883a267cfca5a4
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.