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.

“My brother showed me this app.”
Google Play · 5/5 · 2026-09-13

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 3198489507

Proof data

Record hash (SHA-256): 5190b4a0109a17b83d5f6b68e58eab965dcc58a55ec2db2da719386f134a82be
Signature (Ed25519, base64): GtaUSTlVLZvwXCox5mr2z5pAAPCVZ5TATqiTABJejAP2is3ikj2w8vnwo2MlBXnOFn32i3aYRnTshVjhPi9tBA==
Merkle root: 240cb93491796b59a812f7182e64c43781541345e454701e4066e1786c286494
Merkle path: ["518ffa80ab315074fd69bc612bb944f6550de58f3fa6ad60d43ce79d50a10438","b40e9b829f60bb6b36720aa9e71a44e66f0a5ff62ecaff3123609c001fcb1c7d","9befefb18839410d84ce4b72e57bb262944b259c4cf6c2a756ed57cf68921983","92a823fb9aead1da7f31f319f4223c3327364ab7c5da0f82b2f78d5bbf15481e","e73d66b5c2afab1894d59c3a9b5c17bd1e831cd0c9de4d460cc6fdfaf2168332","65b5c494d5f1ac761a9a24c0bfea3526ed07bf6f2ab8fd5a58ecde3aafa8a6a1","a6280a0bf32559ffc021fd3535f732357e2de0dfc63260d762d8e064f7752b50","53290eeca8f8985d940119a320de52c0059dbe06eb36c7aa00f218297a73363f","53df733f7a3dce376fbf03991ef93a2136da646e2f74fc9a10a1b7ed756b6b00","fdc6acf01eced546f9d2b8658934cc651d62ba2d57e1317249c015401ec0b9a2","5ad3197fefada8823cb614c9da506ee86fb12989dc027331e7ee50856a840f74","74d570f87708582f870a40ca5a8a7690d6274c3d406d2a50e5092b918cceaf30","d18e44bed2d452ffde94f0480bad35bafd04d9a4d8be46c5e3464f257f0111d5","0d65160dee55e809fe06e5334fb3150d04f822ce1cb47b2ae30b5d21efdf0eb3"]
Anchored: 2026-10-11
Public log entry: search.sigstore.dev, log index 3198489507 · entry 108e9186e8c5677ae5cf…
Expected log hash: 50393c13ffd4f8ef4c37424a8293b422d8c3ecaf6b9593225e2bb93e0cf2c210 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":"v1791686710415","kind":"published-quote","locale":"en","page":"brand:vaia","quote":"My brother showed me this app.","rating":5,"review_date":"2026-09-13","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 (240cb9349179…), 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.