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.

“especially for self-assessing content when uploading study sources”

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 3199295725

Proof data

Record hash (SHA-256)

501f152983c94cefd937d7590cbd96c3a26202bbafbe7cdb5c187bd913f6489d

Signature (Ed25519, base64)

4DteOpvgzIydDiJMparB+dOvLGmaiQ3m5tBoGlLyW5V2YQVi8A3bUL7qcZpoLHbK2wF6Yu75zyI0GVxYrh68Aw==

Merkle root

cb5472fa7b7f10b7453a4f782a38c5dbb3d782ac291369ed3830c2ab783a230e

Merkle path

["5023982b646aefcba124a83b1be7b542d8c28cf451fd4df1f42d63b530191927","757d6983b434dd7adb84e7e90a802316c3348033d5e353c4f6c7e3f91b2b2208","62cc9942c83e03b8a8716ebc49c244f0b84666f3c2ca5bd3122757ce0f2445d2","c44bf1bf147acb35413c64810ac82c48329dbcc5a39e123304df4047ca98d3f6","1b9d20f44d960dbbe467e0082e6043731002f11ca0dc73be7d77e40be3a09036","204be3db621d88a2a2837588b08a65daa852e0fd80924915e67859318c0331bf","1a2b6bf8fffb0fe657b9462048eec0fa1ebe5480123f890b554ca807070c6290","2cf183fac94b27213bbb386444809e6147087506e2295fac7142e918b6242df8","b0b8545117d5f95f34c56ce54d332c7fa3c8b98b3a8da7a9bcba93b0105c1b51","7d9fa0433171c48fc01cf555d492a88251809b8abc4571252609661c4b39c899","6399f176a566a664e6bc047e39a9201bc70b846aa40224bb4200ea3a20c50435","985e8226a3e0c2f6e4183d2b437a359f1bd9336267c62cdcc26c3031df5f08e9","d5c54f6be615dd1c8e7a065afc12e543325363bfb66a63065a4aa1d52a1dc406","6ab0f07aea38f551fb6ed4456f21bf7c468ab54859dff87b6772a51601755f64"]

Anchored

2026-10-11

Public log entry

search.sigstore.dev, log index 3199295725 · entry 108e9186e8c5677a3fc5…

Expected log hash

59b8cd8284c909c35d85f443b6a086d482f8b667c56ec942d663937a75e25638 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":"v1791689736846","kind":"published-quote","locale":"en","page":"brand:vaia","quote":"especially for self-assessing content when uploading study sources","rating":5,"review_date":"2026-09-17","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 (cb5472fa7b7f…), 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.