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.

“Es ist kostenlos und unbegrenzt.”

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)

b43ceb7135f9a8e189c8071b177fd09b14d1935f09b8df1884fbecf9cd868308

Signature (Ed25519, base64)

ixuWsUOhcCEwwyAJUsBEVRBkzh4TwNjdRgshp0BktRDrF3gJ6ftS0WDg+tMyouL6ZHRxFFodpnWHNW9UeNkOBA==

Merkle root

e299bf38720a5a91bdf63bbc0205245bccdf3432ab1652c69342549658b7a9ef

Merkle path

["b43f322b35e6c72e7865e17390ee5ab83830d09a8f91c893228960b7c0fa6fd8","f4f8dd6b6fbeaa329aaee10c8768dde8146ee1f2d0276ced3174310e5e91bf7e","5036fdbc1dce63b7bb4cd1b1097a5929dcb53dd1484f9f89978f8d3aa549aa98","7f1e3b6c8a6c4539343e7468c616f6f4de0ec4cf4733e7ad25c97745f75517d2","bd1750f8e35c1d7d095869597bd79009e08318ef620910fcb46685c56ddf966e","7d188c2004aa7e70c13178e39b1ea30622ae66786ec7e631a5527028fbb98e39","1dbfa5455d28ada0ce8e9f1f8d47565e658c6503752447ccf025a1ba106ea6d6","16dd2ae4816eb6245d7fc992352daa055f00c3bfc9b99c267c674fe30e8dd21a","393270826a76bab0a9181e4ae2b5d57b8d67531bfd5471d599ef5312b1c4ca03","620413bf2476cd28d325605187d6aaba277996d6475a9bac38fff50da78fe34d","c5b7e137a8013a4a21c1d5b67afcd303b0734422cc0c2253880dfe8a42a53397","6c2612f525e9372e44b0deeb0737e4e68d621df2f62b7144b07119251a9b517c","b5d03b72964f911025dbd61c2eea673598b47768b7619e9a279966a44a138147","e3714293de39ce3c6e3cb9d5ea7711343b19d2be532c75504682d8ef52e8f91e","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":"de","page":"theme:vaia/price/de","quote":"Es ist kostenlos und unbegrenzt.","rating":5,"review_date":"2026-08-28","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.