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.

“Es ist die schlechteste Lern-App.”

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)

fc3b7c16c6597fe6ff3647c642bd665fb0d36ffd4cf299128d7ee3d580200c74

Signature (Ed25519, base64)

x5XzyjXtrCLB6tNRx+I3wi/jTc/vtw5FMZshKr+Wpt+WwsUI5MLZiRKdbWaZuli9VsMst+6DHeSEcrhigQN7AQ==

Merkle root

b9a08f9d6d76dd148110a496219c42cf3205c6f982800d84d5c85d77e9461e02

Merkle path

["fc3e65c57158453fe3825f6ddcf995d66a23b2d05ce93eabdd5652cf6a88792a","7f43bcae36197e36034e3a45a5128793ba9c99e8ca476b4da70d36a2ca75c8fd","9e4e621593c099537acfe95c41c20deaf5e5ccb6b995d35de7ffa98541e6a5c1","d6018eaff84b629c275cc83b621d606ba194ff942cf515fa0d1caa36b185d5bf","25b311936a51fa4076b2634b8fc47933f5fe889a016a8150a65c43ac5d0c98ae","11b0f3ddac42ca3db489fc8f162b9f80064256d5f2b7ed32f78f239db04e65dc","6ba95b31cf8186afb1989f9f6e11dd27fb24810972611c511ea5fe37cb63b499","3329a861aa296b2ea844a9fb46bcf01c5fb7e8a78cf297d1f9053cffac7189d6","fcf57de0a9a49cca33dd83063b1458d8fb8b87f660f97be895aac16e06246343","e34df4682f1b51d069b490f515c441bcce6394d17d5ce5081e762d6a54690971","58fcebd1d3d07f3a6ba5f31279f2ecf014cdac37bfe65872be1ec5d6a456940d","e89b125d6d75a826a464fa50668f6e82a6668dbc929bfd3fce7c23cc14adfdbc","c975f4076f62a76765a4bc502e988829db65110a1650004b828d2dfb5f90a9da","f92a7fda99af63eb008476cac47b147880eec6868f847624f8b438c917195408","4543e8b9ac7bd077d9526acfdae449f0a0d5517cbb42414f50ef930ecdb9470b"]

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":"Es ist die schlechteste Lern-App.","rating":1,"review_date":"2026-05-24","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.