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.

“Hilft sehr, ohne Grenzen”
Google Play · 5/5 · 2026-02-17

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 2907673729

Proof data

Record hash (SHA-256): 93d192bb4e95c706687ea805231f8786450cf8cfb4543e47a9cb37300bce8851
Signature (Ed25519, base64): WSBAi4bmSGle83rTS30A8mSMg/MxUp4Mej7OKE3+9YjQp5AFVf82dhjlTO/qUPwIAdItXSbz20ANOTC4AZinAw==
Merkle root: b9a08f9d6d76dd148110a496219c42cf3205c6f982800d84d5c85d77e9461e02
Merkle path: ["93d2aea4ab9ed34b3183b84a6fb13f2a91ba2e2c5d070f67e518549ab1967318","00c3983156ebbed2abca9e129354d562a9f92e1d4b61111ccf9744db2f6645d1","e9314da22de03663c306961f107251aa1cf49532e6ebd5d76e47175b78b0257f","5873340052c0bb9e46c9cb2570d0ce9f7303ff1b6716066b60b63a5974ea337e","1f95f1d9c697adeef275d333be14dbb239770c13bef5541d155474096a33014e","05d4ea3bf1b963e898ae807bcea421d9c2fe390934783a13e222d7226eac3fd1","e9a0d8ea38401147c4159cc5a11d175246de570f26c0d1d86f9e16516a693305","d75805809f29f6ce8fb5dd1d1983db0cabcb663fea326c854ff9acf55c4bc3b6","e71173fb30b4860618cf8c89cdd45d4a25efc76d2062268eee115dc2cad5122b","d285106698d21cc7e49a517bc9f384365ac996c488c66c985df813e3877a7de4","bf77cba02c08849fc4a9dd414e0e15c17e1f6b56a0b9c25793199682cc31bfad","86f8c9575acc759d5eac58ad776858ebdacefb73351960cc2bdae6ffdcc2483e","e73087a4c89fcbfd62483a37ad723e600377233e603592ed8ad92c5db69f30f2","05978e8b9ad5fd39833c65b8b951e8c80cf426334c441fa8a8bff8eb8eeaf534","4543e8b9ac7bd077d9526acfdae449f0a0d5517cbb42414f50ef930ecdb9470b"]
Anchored: 2026-09-22
Public log entry: search.sigstore.dev, log index 2907673729 · entry 108e9186e8c5677a06ea…
Expected log hash: bf9a74000249ba6e66b1e29aae9d8cb95c3400dc118569a80e5c0949f3e8ac62 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":"v1789969984102","kind":"published-quote","locale":"de","page":"theme:vaia/service/de","quote":"Hilft sehr, ohne Grenzen","rating":5,"review_date":"2026-02-17","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 (b9a08f9d6d76…), 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.