Certificate of authenticity · Verification code S4NTQV5YMC · Version 1
Family
Tim Berresheim
| Inventory number | TB16/E 52 |
|---|---|
| Year | 2016 |
| Technique | Radierung |
| Dimensions | 20 × 28 cm |
| Edition | 50 |
| 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
fdde0699cd32844cda2f59828bb0c22c0e1f940672cd64839b3750d2a584ecbc- Signature (Ed25519, Base64)
jkfb97sDtCD1/R5EIfadgixhXdRS5XKXyMtW+cF5iwfa7rIlHTomYthLthnKyH+rAiZQdI/ty4IV8FTK8reYBA==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
178bc1f22a3b5fa3de554678ec3e57cc2f07bad11274dee1d5a54a32fa992355
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.