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.

“The app doesn't even recognize PDF files as such.”

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)

f189bf08b642d4e3b9a10812bfc3c672d3323799cd665a7ec00ffe0609fa3927

Signature (Ed25519, base64)

Ufrr5GrajcCWMDoxWH5AzkJHzbMcOaA6oj4bGUwFp3JWvDBzTViFYxN3UqQtiHD6CORkbypbm6bO66VK7tT9Ag==

Merkle root

e299bf38720a5a91bdf63bbc0205245bccdf3432ab1652c69342549658b7a9ef

Merkle path

["f18a0e5ec7098288d9ab899a8e842a700b10f7e68109403369d20700c391a15c","5084cce1939146b559a62427fda53a8ee37b28df828e948de065a9ad494d23a7","e8efd7b24555597c76ee4b9639403a2787a6eb753ea47fc51eedd1551a4b0ac9","856b718014a2b46188760aa40c14bea6c9834a6c7e787912b678458f8ea2015d","9347aee85c4d73281de4a4b64e65dcbc8135e2a8deead68d37b4ee3e127fdbfd","b52691c615d7397221ec05fa0aaa893dfc9f34483cfe75416a42ebd8dad6eff1","9aebd3933c4b466067f50cadaeee48e8e75e57af2d645b31eec676bd033ddd23","8a6e98d941cb0db675afbf46eafa4182b1cf8ab1b3013ddaaeffbe5cc43ea051","5d5a4687d78bb553c94f7e45228a1539739dc15e71a28444768fadaa3e674d15","715b178d1c714016557207318fc78c34ef829dc799125ac93653f7df74e3640d","b331093f92df4d03f0bcccdb4c283a2d98779d6c363a06d0cd9c35338c6b7f1d","b382aebc31acbad71afb3ae06e4e6f9b354e9da57050f36d03bb1ef97dab503a","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":"en","page":"theme:vaia/ordering/en","quote":"The app doesn't even recognize PDF files as such.","rating":1,"review_date":"2026-07-23","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 (e299bf38720a…), 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.