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.

“My grades have been improving ever since I started using this app.”
Google Play · 5/5 · 2026-09-13

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): d5568bd8eebb0764ddad5deff09cfccc8d9192b344cb3eb1d0435f446f74e35e
Signature (Ed25519, base64): 09ni1IO2tOey7G0pCBDHoccape1DwGjhawCIdWDXlOJckBk22vpVnd1nzI2hf2crneODAYgb1wS9iYZeK4z9Ag==
Merkle root: e299bf38720a5a91bdf63bbc0205245bccdf3432ab1652c69342549658b7a9ef
Merkle path: ["d555c41c5cfdb82df8d7e6a2bef42825f4629ab4239941d53338fddd24b486ff","258b9d72b60a4481b0eb42cb945b352b2d02e0a2478c973fcfc6a9d81773bad8","68cca0e711908dcaf025b35f825f31d91d15a24c8722ece46919e6cba847159f","85d430e634d438e2e01464f5ef3ea028da1d24461fe91b3316ef4a6b4b491ca6","9147a7a1c6d85b57e52054f85442790500d519c5062080e50ccdef8cfc5221d7","94c1906dd563aaade5f9b21975c6107968817fbe8c50ea241660f552a389fd58","c03942df027cd40b6915f55e0ccc336f50502849d8061d7e67bfef08e097956c","d7735ff38693ebc6dcaf8ca731e87c78a229fa5390aca580ffe463a500dfb552","469bdbce264e34057e67be98bc535c774518089bdfccfb1aa8ae1dc48356c42b","634d2be91479ee364267edd428e0d4b767a395338df1611ad1dd6483bb792eff","8dd3545839055f7d4fd148a3c52b8f00591fec4cff65bda0b272f8625df59986","bf08a7b70abd12d7b26586897b736d1c0404f066aa427e277708a875f0cb6bcb","06f94171d32c86f72a9e1d984f2a7c3fa7bd9f00a98eabaa3fbd7d57db71aaf2","e3714293de39ce3c6e3cb9d5ea7711343b19d2be532c75504682d8ef52e8f91e","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":"en","page":"theme:vaia/quality/en","quote":"My grades have been improving ever since I started using this app.","rating":5,"review_date":"2026-09-13","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.