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 lernt ein paar Dinge, aber ohne Premium lernt man nicht richtig”

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)

cff80287b61dfe2a6b44c588a58d6ef3c111a804d7f252aa5362960b900eed49

Signature (Ed25519, base64)

3oK5ptmJo8HVHGgmRDnSHu0kfpp1GNs55TYHUwmu60iNad1BVbEptqQ6qZ8bOttR3tKGu1DG6K70tDHBmUTuDw==

Merkle root

b9a08f9d6d76dd148110a496219c42cf3205c6f982800d84d5c85d77e9461e02

Merkle path

["cff7a80c9bd4b3895d35822d04c8c940b76ee019366166ac6ea65b605bc080dc","acb373cdfbe39347ddece15bc26fa865a7720c49414bbf188b7a0737bcc0c99a","af04c4f82663b7d63e3f45d52b8b854516e1047c38332c5788059a0f6cf71c9c","530b9791235e0ab10bc3682932e927f644d321dd12525041e65bb4ac362b1e2c","3dea6f78d0783d8eb572db301989db0d9c1d99fd9d1b1980b8d9218c51767dce","c52aa225f08af767108e9cee9e639f5aa75a8d892249560c74a96ad1a2b1d2b3","3508a764a152fbcae023fe0080d7664db6c4c735abc13003d2263ee2ef13249f","d510a221c807b696d58d3a8867061d60fe73d2273edf134b2cd3f323778f87e9","b13147aa4fc2a97ef28d17b56777c35db662e1f035d152f3cfbf0268cb006528","993ba8af9345b68edda1f6bbcf44d39a7a29f45add55401177b78cfea94d4408","5fa4d2509ac4b266680172a1d644b9603830e2992eb99b956b8d4389a86690d7","1324e7f8581b1cc3455b81e88efce3958a5b23eb7205ddfacaf930e32b10bd47","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/price/de","quote":"man lernt ein paar Dinge, aber ohne Premium lernt man nicht richtig","rating":3,"review_date":"2026-08-08","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.