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.

“Therefore helpful for studying”
Google Play · 5/5 · 2026-09-08

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 3220367991

Proof data

Record hash (SHA-256): 50e58047b74330b2c38ef26cc48b503fe2017da8db9f09e2092f58ed914cb2c6
Signature (Ed25519, base64): B9wvIqQqHOZcDEqenEhQIKGy2/AibaDmF9nuyBC7G9uNsf69yNuJNRIjw0aU1OOzQMIA+vm36vnya931qP2+Cg==
Merkle root: 8e481f891fa4a8f9e77c0279ca152fab4383b65a50decc840d9fd7569bdfbaa3
Merkle path: ["50e67b53a1bd076e00ef9667a2e687bba2007c850349e43a1fedd3382c837b0f","e5289395306ca6eef0950bfcd57b18177504c45b599097156d8669098459d722","4abeca1cc1096c05e66512241af32400cd1e13750705bdcf744bb5d526969888","ad3c0debf5baa29ca051b3be60f0caab0431c99140d031aa964dc53a18b2618c","5313a3520cefbdfe74970515dc118cbc1bc4171c75305f807d12b19b3f89e51f","86911db392eb7ada83661dcc26c4ac6187eea491f39b4877da7d6ff1d810bdda","84125358ab150dc40d0864ed9b0398ef72c937dd3c4ea1e81dcfafc78e5855bd","e99cfe13fbb2d14ed4fbf089b3e15f30e7192308901ffdeaff1cedce0afe59a8","ce19dd1e9c5dc10d5a9d7ee3cdd58f53a163f9cb0e342a7b09d2cb20295b9322","4534f74f7ea74231e7e4a7114d1b60e122b252d33b1ce6d93bca340305b1c2c5","b0d19eb198ae92cef79ff7b06a3ab9a6d60fdb5502f9f4962c90f48d23c66b88","3b4f21b826cbea2d43ed04a02447fd6a5c5177bac5ab8f0646d2865e69ab2bc2","a8a51e6cf51feca9c73f59ef001af57f41b1cec2b5f25963206b5df2878ba531","391099ea13ca712ab4d3c0ebed9ae37f021122ce33d031a4f3442fcba2038ec0"]
Anchored: 2026-10-12
Public log entry: search.sigstore.dev, log index 3220367991 · entry 108e9186e8c5677a60ce…
Expected log hash: 9a2b3ddad9c3b29dc171a15554fc81f3d4710c01a7565bd2f28b92e7b639f6dd 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":"v1791776812348","kind":"published-quote","locale":"en","page":"brand:vaia","quote":"Therefore helpful for studying","rating":5,"review_date":"2026-09-08","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 (8e481f891fa4…), 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.