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.

“der Lernfortschritt der +20 Karteikarten lernen weg”
Google Play · 4/5 · 2025-08-05

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): 338e645dc86a1135d2dfb96da1aecec78caaee8ddb35de97d49231318cfb2c34
Signature (Ed25519, base64): R3un/tdrCWugb7Lak788ADfUnTeSX0QYyHJIa4hjWAENaHeIRspZwezROX4Bk2sm8Hi+6lw1ANvcqzqiqWPFAA==
Merkle root: b9a08f9d6d76dd148110a496219c42cf3205c6f982800d84d5c85d77e9461e02
Merkle path: ["338c68b9f9f3c6c1763d29271eac2d5b89db0b919bd69ceedd8cbb8e6de2f397","4e3c7a90255d7839dd92b79cea0378b5e45b1bfccc6bf6fb57c60de4b6507238","6f74a4a862c487a4082975d5ebf2d050f33f0c57a350388b6b36bc657dce61b9","c061152271567c6c36ed0a4b834c81daf4d71ebf93fa784ba190b443a631256f","8d6ec192c163a86da3be1a0e9e461a385c22e10e02109665ab215f1e8bda1bfe","0d65d05be941a362ff7ab107d888ebf6958ce45b74d018019ad141de8310d72c","4b519fcdb8c3442b0ee02838d59492a2fd6a74414d4b2669481a828ffda21b8f","4e02788a282d9785f4c1428548ca5a11af65dacc2cd228f203b5a9bccab9253d","47504f5d0fc8a78e339b4713b158eaf28c8a241eb090a81058f94e36da3ac5cb","6aa9f68c189b18c9f2af72d9880d9c7e1a9ea3d77c5da498c41df53490c7f9af","e0f253c731d9a50fc143ce3dc5698955a6cd944ab369251d35139d245d1f6088","c7178b4eff2fba3e523e57ffd27d883eab0b92aca9ab4febca6b4f95755695c8","17354708d69221dcc11d442a2ae8d1a8fd9ce3422f52e63a29a599e2bc987d3a","7a4792c9dcf9466d19ba61ec3efd4f578e21f2d3035e8fa6a6264d3045083f7e","43a562d6822dab12c673c1efa0a3171d1ef69b949f676fb01847e1e5b56274de"]
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/durability/de","quote":"der Lernfortschritt der +20 Karteikarten lernen weg","rating":4,"review_date":"2025-08-05","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.