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.

“Man muss für die Funktionen bezahlen, die man benötigt.”
Google Play · 3/5 · 2026-08-13

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): e8666ab3229e49fb635af52a6ed224cd57e5f1ec098c5debd3868f91b3803fb0
Signature (Ed25519, base64): 3y4TZCtI9fwoyO6L1Ik6/B09G1w0bfBKczgVpE9VXaB+TJl04+VaKkmyOFN2BpHxMI6V6olZFf7nwTrIeN0mCw==
Merkle root: b9a08f9d6d76dd148110a496219c42cf3205c6f982800d84d5c85d77e9461e02
Merkle path: ["e8668847bc8e1ed6f229befad79ec67f4e4fe3a7f09b14130afaca5a4415b78d","2da4ff0e865699ea06e996c671b1ee7772922cf8b14880ebf606df493b6566a9","55c7816489fd81d8a0da783bbb036f0f958d92742ce7d5d173045b72b7d68847","9bd81a2ce282cdb99c4744f18a460c3b9c9a1c81b1a2de204d40e69ab64dad6b","77d43e53a31422be8f172b70e9cccead6078b0bea313fce9eed9086bd8cbe565","277fa77dc8fa338cf11897f5dc878e36ec9d2272e5695ceacfd230135b816eaa","5950cc355fb1281521d79c05c2bc520a64e04668488e24785fc7873e69525991","2139d6f039a2e0e2950626bba27ecd8b2a2e7485983d0bb5ee47bb17b0e39b84","34af747da0e2bdf0e903c7b10a119c73fb741e571778addf996ceb1145ce330c","042f0fec74521bc48ab41f2464714f41d7bee9882be5ad30840278c9559da714","bb894289bb71d3b696c9afbe454a75a78b206d9839b23e1a62e36de1c4316674","2d0841904d905b327cb803816e73e56fa86447bd28a90f792c27c874ed9a6b9c","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/price/de","quote":"Man muss für die Funktionen bezahlen, die man benötigt.","rating":3,"review_date":"2026-08-13","source":"Google Play","source_url":"https://play.google.com/store/apps/details?id=com.studysmarter","v":1}

Verify in the public log

Open the Rekor entry (pre-filled with this proof's log index).
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.
Decode spec.signature.publicKey.content from base64: it must equal Citatio's published key at /.well-known/citatio-signing.json.
The entry's integratedTime is the independent timestamp: the root, and with it this quote, existed no later than that moment.
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.