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.

“Die beste Karteikarten-App!”
Google Play · 5/5 · 2025-03-28

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 3139760477

Proof data

Record hash (SHA-256): 90a448acd7aaeca258d3a9b36bb6c90d55c80d106c8a0f890db081baa77a0853
Signature (Ed25519, base64): jk9kzYQLdFRSlOWefgJi3TbRqQkFAxuU4N3YRe4+1g6qza8S7YKljU4ccsPYpTA7COxHCGN50aojD3FsGHBcDg==
Merkle root: 49133e6803d24035baa1544a5c730db93dbaf832df48f680ca855944337404a2
Merkle path: ["909a1ebb214b15ce3fad9dc9d7e57ce5d1bac480d8c0ae0b7e1c10c7d1e02abe","df0bb4e758e074094a954f10e1ca587ddc443cb45f2e921f9eb05a2fa55b6834","9b719ffa3f73130ad0336c64c1b75bb7f54870630639722fa98769fbecab815c","240884878d04324e2165384289abf0103a2ca0728dea76f93a7edf53e9895912","454e9a7e791da657948ee07c11b76ac8961f901ee666c46b225f090170c67b9f","ca87bee07bb624a6354a349ee88b338d940909d775f2f735f5fe962bcd019447","e89eff5deed3041d7c97f861e98e3b79c7625d7d36e9e1b790d1e00f63758182","567608805fd4c8965681acb8a4b4264af45f424fd992a3ee97cdcd1660b633af","81acc420964ad4e08614b0bb821b71327e0a7fb4630328d5ea389adbe4a6ace4","2c28f7e3e880f853509f9a31d13c465bc20c2418ce1d1c2292a109b214292194","80433a12e22d6fb8f77fa1f54bb614e27b2839c32d9e814d2e34bccbf221d569","35032fb4b21265e7b5af97ccb946f13e153cce8ffea6030f38c78736b8e472f3","111d2d0cd89c2d53981ba81e6a10a0e3f8f1be927d4be6d99e4f29e2d9c3ae52","541a456de48928931fac4c28e56562983bd2f8cd0c9306116286df2e2f1c9422","d81f506ca96dea712a8b56759200b270fc625cf496d323ded3475eaafeb2d916"]
Anchored: 2026-10-08
Public log entry: search.sigstore.dev, log index 3139760477 · entry 108e9186e8c5677ac88a…
Expected log hash: d54b6e5e20903e9be29e6a5973227ee9b3dbe61bdc0fa6481a5788472cd5976c 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":"v1791428432986","kind":"published-quote","locale":"de","page":"theme:vaia/communication/de","quote":"Die beste Karteikarten-App!","rating":5,"review_date":"2025-03-28","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 (49133e6803d2…), 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.