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.

“€90 per year is the minimum price.”
Google Play · 1/5 · 2026-09-14

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): 67ae72d876fee0784a792aecd56feb5670b7599f517f63668865b1785072a6fc
Signature (Ed25519, base64): Vn+gPVsQ7SBL7eordUWKoU9X1rv7mdj0+0sBxwPDiQ6nu6vb5G01idD0rzOQWQTWTFCAyL0xGc9FZPyvw+A0AA==
Merkle root: e299bf38720a5a91bdf63bbc0205245bccdf3432ab1652c69342549658b7a9ef
Merkle path: ["67ae9f26468f106c6002faaeebbc36ef07abf8d8423d6d3ecf7d6b527c5de733","ed2e53c7f1b8e346273496e6674b0aa0592056721eabf530e83546cefc2dcef5","e5dc0be993042456ceb8d51e553d6cf40233a89dad4d374a8feb53b1c28ad5ac","dffba9d92616cfc44c881aba5f5f16f7acca1e714db5caa205c01e4fbb911244","fc398c0b0541f231c19c09f50b72c93974c6ff4c0520755deb10e7d57dbfe5a3","fcba230f68ac203ce7c21da0cad208f21d1fc602bd50e28beda04357908e6dac","dca5f7a7a70c63cde449a85302a098f05fd67697119fd2523dd1b4eb87abea26","33be8c3e44f783aca1d7daff0842c19304122248d17d0fc0369b8ce84d8f4ed2","6b8a9fd339bb734d137a360271d764ba2f054a72f046b40163350c34b4fc690f","a11d0a695ae8e3e8a88068cddebffa9165729ef291640998d776fbaf6a5be10e","7aa88fa946d4600db4322fd5c5c7e63b06825a08572c8be8ee7cfcde8d9d2aec","f66e3f0908cccdfd396cb0e5dcc96f2570e4fe1056c45eec7a7025dce074a563","ac995c9ae640659c6b258d62d0cad1933912ca122fd33d27f90560dfd3199a84","aa4bbeb87247c2797626ab02a549451da6dfce4dcb854a36fdcc601e3e788772","bce5d442c07de6307e5ea8947098e74ce88c2246eda5e5fc1015a6d7519228a8"]
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":"en","page":"theme:vaia/price/en","quote":"€90 per year is the minimum price.","rating":1,"review_date":"2026-09-14","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 (e299bf38720a…), 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.