Quote verification

This proves the quote below is recorded by Citatio exactly as displayed and has not been altered since it was committed and anchored. It documents Citatio's crawl observation; it does not imply endorsement by the source platform. The quote links to the original review.

“Sehr schlechte Kundenservice”

Checks (re-run on this request)

• ✓ Signature — Ed25519 signature over the record hash, verified against the public key at /.well-known/citatio-signing.json
• ✓ Merkle inclusion — Leaf recomputed through the sibling path to the anchored root
• ✓ Public transparency log — Sigstore Rekor log index 2907673729

Proof data

Record hash (SHA-256)

89591ee78ab69ac75a45ff80e7e91c2cbc5049cf3597fe3da6d124c771d0fa4b

Signature (Ed25519, base64)

6deaADbr2iyNNvMQmMZu4XpE2ntCDR9DlHTrcbhw1Plmc5b8o4OhhpclGlDClWlGxd0eYT0Smdq/G0ebG2jUCQ==

Merkle root

b9a08f9d6d76dd148110a496219c42cf3205c6f982800d84d5c85d77e9461e02

Merkle path

["89594830d2ec040154f2b135f54c0a657808c71a101202094d87b82e23dd53fd","3a1f6811eec24a1a4e54a4643f728ab9502599560d7852952d78c577cebb35cb","7f49dbb126eabfb2435b2464b0d6eca57a0b6a6b59996b289c431a3aa9ad9729","bf57bbca9c261e65ecf5d536b0dd29ac2b815591506b7b421920590d9aea1ee3","d968b8d31c6adbfbf4a7d324c4350c27e7d8033692c392c87a2cfa1eeab74078","875e7c149a6dd4444a94ac4eb7cd56f0bb139d5b2906a860e604bd47fc4fddaf","d126c158651a5f3ceed70c22a64fc32da6d713107b648018ba4bc41d82216553","7d2ca3d435d3469f5b8ce1057b7e90976e64cdffa01d1a1f26e5dd901f82b8c6","fa346198f719680e8877b971c5750cfb56e16cdbf15788520679dbe2a11bee1a","8f5b698ec5ff0fc7f38e616167b98750c934b1dd7b41b09f8152c15e06947dce","50bdc76befa6ecd9e0c334b3819af885dcd126bfdf66736d3440e5dc53453af8","d89f5af62fa7d0c6d0a9fe42e9680d2e7af53ca738a716457a3405d68b60cdb4","8b252735b283ab7584d9f6925f08ed38c911c64db001463eafabe5061cb6f9fe","6c299608515c69a03540be35865f96ca4932f3e0403f8f39fb0e1c2e2aedffb4","43a562d6822dab12c673c1efa0a3171d1ef69b949f676fb01847e1e5b56274de"]

Anchored

2026-09-22

Public log entry

search.sigstore.dev, log index 2907673729 · entry 108e9186e8c5677a06ea…

Expected log hash

bf9a74000249ba6e66b1e29aae9d8cb95c3400dc118569a80e5c0949f3e8ac62 The log entry's spec.data.hash.value must equal this value: the SHA-256 of the Merkle root string above. Recompute it yourself from the root to confirm.

Canonical record

{"dataset_version":"v1789969984102","kind":"published-quote","locale":"de","page":"theme:vaia/service/de","quote":"Sehr schlechte Kundenservice","rating":1,"review_date":"2026-08-31","source":"Google Play","source_url":"https://play.google.com/store/apps/details?id=com.studysmarter","v":1}

Verify in the public log

1. Open the Rekor entry (pre-filled with this proof's log index).
2. In the entry, compare spec.data.hash.value with the "Expected log hash" above: it is the SHA-256 of the Merkle root string (b9a08f9d6d76…), which ties this proof's root to the log entry.
3. Decode spec.signature.publicKey.content from base64: it must equal Citatio's published key at /.well-known/citatio-signing.json.
4. The entry's integratedTime is the independent timestamp: the root, and with it this quote, existed no later than that moment.
5. Locally, without any Citatio infrastructure: SHA-256 the canonical record (must equal the record hash), verify the Ed25519 signature against the public key, and fold the hash through the Merkle path (sorted-pair SHA-256) to reach the anchored root.