Certificate of authenticity · Verification code XBJTP7MFZW · Version 1
Bergkapelle Mount Everest
Tim Berresheim
| Inventory number | TB05/E 13 |
|---|---|
| Year | 2005 |
| Technique | Siebdruck |
| Dimensions | 200 × 200 cm |
| Edition | unique |
| Issued | 13.11.2026, 08:07 |
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
ea027c7eff448a72de06b6fcddb5f4b97f79f35ed21b8a8b00eb3f6527e3e0eb- Signature (Ed25519, Base64)
v1QNLlN06KkVanFKK/f1H8+bcY/NBdl70BHBXQBrLry7a37ZWUT73s40g2B8QJ3PZWaLxke2FP+7ujLUcrDLBA==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
f6f4cc0730e38cee1d9a354ab0a602813d5ac825667ca5912ea0a1f65af147b9
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.