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 HILFREICH UND ES GIBT KAUM WERBUNG”
Google Play · 5/5 · 2026-09-11

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 2904877428

Proof data

Record hash (SHA-256): e5ebc9c9ebc5861724ec421f448a519cde531d6d086aed0127192d7528a7d562
Signature (Ed25519, base64): TACWPFQz6eZZ4Pfa7B+9RhVmaQh0VQikPkp7kAMu0GqmKX0lpzfE0ePF8b7D9brlQfBw37SxzfYrVBbfaiJYDQ==
Merkle root: e299bf38720a5a91bdf63bbc0205245bccdf3432ab1652c69342549658b7a9ef
Merkle path: ["e5ebeba1a315aa58af0a895ebf5a2ccc821a394323607c559f61b6805d6b9f94","b5bba7a4d2dff41c1a7b90737f2c586e96d05edfff9d00d128776bcf572e6800","5fbfe71a3e77c63a4d499e914b49020406f61c40d661b9820a503c6d8f73a5f3","b020dfa6dfca318eb772b3854bc440468aad1ea250b8cd34cd7ea2295ff4e84b","f6f350ce62744f052e4a21dd455371e3873581a02140d9b5a18605a4221507d6","3dfc7e72f8c05030b73465e33a8a52e7f5109d8045c2354788d26c4122809620","d81e57204524c519c8814ce70608b6a5255eb3b35834d07a5791f6796f96c656","78f00933744b675960011f98e9c8229777eacca0151d2763611ccae3c6038980","1a7be9534eee99e33e42143fc7c7be074cd83b31e4f7332f0bcaf6ede899a84f","312a271d0a96a819a67a6e9c1692af1c90f1f1c07453150490779ef12aae4297","61847aed1e15fe38603f3749ed4f967e83902fabcda16f828dbfb3db9a44d565","d28ed21d4373cfe7811429a5d4926ac987665261fca2846c93ddc2c90e391266","f95e3a68f572f5650a4093453e2bf28168547fa91a01ce08e539b3d7016a3f80","53a8a23597d45564e495678bf6125e41ef42f347693c924494330dab53ea1e2d","2a462314156907e42d6f0d96eed96123f1d79516aef73ed189d9f5466556b638"]
Anchored: 2026-09-21
Public log entry: search.sigstore.dev, log index 2904877428 · entry 108e9186e8c5677ab408…
Expected log hash: d020708737f55ccdf49203f373fcbcefe8158cc388605556fbfda3c365de7360 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":"v1789881486272","kind":"published-quote","locale":"de","page":"theme:vaia/ordering/de","quote":"SEHR HILFREICH UND ES GIBT KAUM WERBUNG","rating":5,"review_date":"2026-09-11","source":"Google Play","source_url":"https://play.google.com/store/apps/details?id=com.studysmarter","v":1}

Verify in the public log

Open the Rekor entry (pre-filled with this proof's log index).
In the entry, compare spec.data.hash.value with the "Expected log hash" above: it is the SHA-256 of the Merkle root string (e299bf38720a…), which ties this proof's root to the log entry.
Decode spec.signature.publicKey.content from base64: it must equal Citatio's published key at /.well-known/citatio-signing.json.
The entry's integratedTime is the independent timestamp: the root, and with it this quote, existed no later than that moment.
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.