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 3247957099

Proof data

Record hash (SHA-256): 41e1c5776d3592f0d83db1faff533b32d2f09d0568738f6e35d10de902262a23
Signature (Ed25519, base64): R+lm2AySHVOC1CAOC8HcmZ49q7TtqZhtMhWwo5zf4xELLSWd0IDD/mTQqxLIkCmcyvaxQsdnEGkhiQsBzNLTDQ==
Merkle root: 417e79c5636392fe3ad064f685f70971e5d532c1ab257f052022be5e8b8c0dd5
Merkle path: ["41d75c7a08d38a2cc2ddc9ef4e35ddd8c913854dcf6b89779a33fa63991c8fe2","dda382322db448d61529baf123db161899dee360a211b0148cefe9784e75568f","a35bf5d7892bcacafdf77d78c07889a045ca18dfc4140924efb09c5f55c16d42","c1808ea1a518aed22e6f2c2f852119991e40b0a96e43bf5d73c8bfe568c65e08","f140908639344d039b6de6cd74935d29b8d4613addd6fac1ef061314c5d14826","8d9336d9b3d6654610d86fecb18a1ff7efe408c204fe44c2b02a6fe9a4739d5d","ead9d452336aa940fd98bf7cade4421d9b64e9dadc223b42c24cfddad490fce5","95c9b0d22435b7b1b2cc73c3863d0d2806b2a11ae2890e57fb4065683f205aca","21781da3374a3a0b465ebc463493f0299002d6fe5216831222d4002ed54e0bc4","dc70906be22146dc22abdbf70f0dfea9a846a7a3e7998a4995c25a335de41464","71d3914470ca71dd4f06df16d7c9bcad63ef10a4075b2b39691e2e6dbea95dcb","be60c6901c0139765faf2ac0c808c7a5cbd967c6838be8c04050584a567b2d16","a3445df7b332a2879d9dfcbad4af79652a13ea138d6afeb81448d347f1f2d128","57e0ae13344994ee6a0ba58ca5aa3276e7427d3c63abccf6f53bc322580decdf"]
Anchored: 2026-10-14
Public log entry: search.sigstore.dev, log index 3247957099 · entry 108e9186e8c5677aa2a1…
Expected log hash: 86fba1d35010991e0e45c044558780825516b744aa3dd43e559455260fbef42d 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":"v1791946591199","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 (417e79c56363…), 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.