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.

“I used it for studying, for my university exams!”

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 3666689888

Proof data

Record hash (SHA-256)

0557ed097d12589908230a0f962feca1d464c910ba098d4c135ba42b66269067

Signature (Ed25519, base64)

fSYae9QcS7sD2JvBgcrNFlhP2SMESXxVyfxAX8l9fL4ItL+K9+PZ8w5drV7FjEU3ONCiobGEzZ05MRVB5dAIAQ==

Merkle root

2398b9ffe5a3df5012483239ae50d07265a8714a6b9a03ccf48b3559c47e03cc

Merkle path

["055d59434964de1f3eb9d24fe2356063c0c691f778f61647c26733c348f1b6e6","435834166ae74745bb60f112915de539a9d5aaa54f04ec345ea36b6ec89ec357","23860bae459791647c3660c5a28eefbea5607bda4895862a65c8139883d30cac","25e0a5aff39dd70fe5c6cee0a0af62c5b603849ea79897fffc60f5641cb44ded","b4087b6852c99abb68077db1bb279f412454a47d5a7b15314798d2be59cc4fdc","a3d728359a9696ccdd7ab83c5198e9d18e7dd4d221ad0753a865736dd65711bf","e2091394daade359de2104d4d7e8d87f6cd8fba5bbe6661867dff583cb240cf5","e381824ed4d285ac2c5993b0fe55a1b678701fd7a6b65431b8998d6ddadec684","064954759a2c2e476e27742f2f9f6955cdc1671f1340db2b02c04684b09c0837","6776a8a030abb1520d2064f18194a96132775c499f48072ec04cebf82ecdf3d4","a505e83ead23bb585f8c086da9b8f713935fae2b0f0246680b2710029f91a4df","3c9498483c19a648725a0d444d70aacd539e3c6670689e94505e87b6aa5f9803","69e20c73bdb345f66641353c13ba7e73f98bd05396ec371f55992c40dd6b22bd"]

Anchored

2026-11-03

Public log entry

search.sigstore.dev, log index 3666689888 · entry 108e9186e8c5677add57…

Expected log hash

081173480bb584ab401065f32774d38ee3dfdcda0f372573695ae49a257a2dc0 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":"v1793701859167","kind":"published-quote","locale":"en","page":"brand:smallpdf","quote":"I used it for studying, for my university exams!","rating":5,"review_date":"2026-04-29","source":"Capterra","source_url":"https://www.capterra.com/p/172606/Smallpdf/reviews/","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 (2398b9ffe5a3…), 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.