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.

“the learning progress for the +20 flashcards is gone”
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 2904877428

Proof data

Record hash (SHA-256): 2151159470ad91d61386d26b2251499fc8bb2d7d04a4d22a82d93705beaab645
Signature (Ed25519, base64): B4O5pK1+uQVXomK6UPmI6RcL/hEWn/XBL5/NXrEsI4QiF0h8y3/btNDRatLl8/woQpO/k3ITOSKslOJDhYHHCA==
Merkle root: e299bf38720a5a91bdf63bbc0205245bccdf3432ab1652c69342549658b7a9ef
Merkle path: ["215057bfb1a600b0fb6606b29f017b2c68ef6a15f90f94e5af5d1e24a6202498","1aee2268763e2744bb33835d4f8db38882bb87e360a20f2e2a05be525dc41ede","f7c63e1aea80f6a64c62b854dc28045fe3468475a29302b2e46ab341840c28ef","7bdfbda1499830596d1a0c8df1e61f1c0facd42c42aaf490490deaa2601f0e9b","5f3d05ed4354d2e792e50316375ee92c057b1ede3581ccec78c7f08f935fd4f5","7b75d9e897b373afcc5b7a33aab7c851230349b6ab43387443fa6fdce8c35b77","9c79535ad2f565295cfdf12cba18cc22dafd1345bfdcf80ceba00d86e75e7f29","f9376d802839242938f06e8f79f734928e987f932ffccdaa10e6a24eb1599469","6fc5d337e4a9a328c18f8ad979b507f2f8bed165cd7afff71e73380528667bb2","6a4bc421e378adcb3c9b249c80f4875b8301a2e6d2d580b18b70c0137cfbf5bd","4cf64c3b17b250809476ec58bc3e326d674084347904af4393f609765e98f831","31f91261e54510c82e0f505e928dcd01951b5f1b3bd1a4ebc39a5ed954368324","e3c57a8cebd6c96ff44fe2cffa20a59e203e20975780cfe446c93ca7bbe448ac","2e838893ef313b8ef0f87568e1e691fc197dfcee84413640a12968493decac73","bce5d442c07de6307e5ea8947098e74ce88c2246eda5e5fc1015a6d7519228a8"]
Anchored: 2026-09-21
Public log entry: search.sigstore.dev, log index 2904877428 · entry 108e9186e8c5677ab408…
Expected log hash: d020708737f55ccdf49203f373fcbcefe8158cc388605556fbfda3c365de7360 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":"v1789881486272","kind":"published-quote","locale":"en","page":"theme:vaia/durability/en","quote":"the learning progress for the +20 flashcards is gone","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 (e299bf38720a…), 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.