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.

“vor allem bei der Selbsteinschätzung von Inhalten beim Hochladen von Lernquellen”

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)

c3b477f5912d52c645dbb495ff73d0f7b1c697d887de21267756b6c8d1988dc1

Signature (Ed25519, base64)

rkY0UGJ04DKIpqiOSlKEJ0Vx1dkv9ZYqIx85Sud1DzrM5eGM75ErccOO/Bq7PNbBXx4rmUGWeoGno9puKR9yCg==

Merkle root

b9a08f9d6d76dd148110a496219c42cf3205c6f982800d84d5c85d77e9461e02

Merkle path

["c3afb939d41cfa407acb688e2cec73d07aeb3b67aae7eb7ff625d718e33daf6a","749907cf31a1143d3028d9e51fda0b4446603c141b9bf09ead38f70f15538572","872e849f1832bbd2a7f9dc555e7ee67fe0faef36a382a566d06e6ef2a5efcafb","f8dc4d8163bb5ceb70663607e8bf90da42ac81c0e6cd786968f94039dc57254b","d6c700749c08956447e8aa1007dbecfa00fd6c672885b8684493743ec27bc1ab","84b2bcd1c2b61e657146c4f72f825120956154277788a56d45e8281dec533a7a","f9c2fc8382ba55a72204eaa40a4f2212dbbc89683823739d210ae4595b5aa155","3d60c02363c4e75291955c2b74448e788824efda23b0f6f4b83514aa54625aff","b0e17c6ec85087f19ab68508aed0fa2eb061d23719c9d0a5f1e1d9394db4931f","c13b74978a11b4b92ffacd68647f5e55e7dc77404ea9cedae4d2e04f1124de3e","d6d7ec5b8671612f1afda6d1c341da4ab277e6a515ef03b097a08ef2f21b6a1a","8e90fbff84453d26da9a25ba9530d677aecf62355e82abaefcef4642ecd6818d","ff0ce3b59f4b6fff6b806e01d20d764fb2b7a5651693c19ab4bf8a8b5ce5f968","05978e8b9ad5fd39833c65b8b951e8c80cf426334c441fa8a8bff8eb8eeaf534","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/quality/de","quote":"vor allem bei der Selbsteinschätzung von Inhalten beim Hochladen von Lernquellen","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 (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.