Certificate of authenticity · Verification code 3WE6PQ7UAB · Version 1
Zitrone (strength from an old root) Family
Tim Berresheim
| Inventory number | TB16/E 51/1 |
|---|---|
| Year | 2016 |
| Technique | Radierung |
| Dimensions | 20 × 14 cm |
| Edition | 1/7 |
| 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
8c3247073fd70389e05743b1480aa2412c3688247ebe619e6ff7430d51775021- Signature (Ed25519, Base64)
VDEShfPDoYujZzwTw0BLE0vpDJ1wqXm2uMzjiiR0Hq07Hab56GWieLLHCcoOABAyngh4VRRtS8/I6fDk6RlYBQ==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
6bb3b3f85d81615b727f88c8f2a2dcdb0de17775d1af0de2f8b08851c2b2a84d
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.