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.

“Ich habe die Antwort erhalten, dass eine Rückerstattung nicht möglich ist.”
Google Play · 1/5 · 2026-01-11

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): ca55564d09fb42ccbcb0b9fd59473158fe2e5db26f74bc03833c2aca194be758
Signature (Ed25519, base64): ySpPhtWPFSmm2KfGhXmSRtI1D/OCq+YRVnyd8rEhvKvg/+8cAth5IdCcbeqFE6Vnq4spjtaNUldb/HRi/5TzAg==
Merkle root: e299bf38720a5a91bdf63bbc0205245bccdf3432ab1652c69342549658b7a9ef
Merkle path: ["ca58594c2cf5721d72d65272f0a5904eb440b48c51f9642650607bdc228d2ae4","754cab1ce99a6d8b07a017dd2e311499ed7ccd624edf3d6e223463cdd545f0b6","cf17cf22d8e41e4f0d87c7931e9461911308e695c5f5ab60bf6babde28d2e200","beaa95499c5e4f52292a7f534895bf4e5fce5613af9256baf9c4991c6fe2f259","f8dda9120d92a2f3266aff162846c0cf57ad64cf3308cd764fd2c2cd201c8c35","0f031465442f92814935b6b4879a6d2e0dbd2bec693a78bf63bb0b0fb97ab535","c7238a750cdcaece380ba9b72004c945a3ad1eaae6159081d036865c22f216a6","02d6288af7300a5cc8f0ad7e60c18de1a178b03f7f42aaaab2fb2709aa543cac","87fb8ba7816697919a0144c4a25e8e3458668daced16283da7814ebfa6a80a9e","d624bcc827d317825464f2b349a46266f6940373fe2bc1f629939a8c24d75dd8","f88be881ea062cb0d1c908f07c2bc25877d657079958d9ee97dfeb71a5747da7","bf08a7b70abd12d7b26586897b736d1c0404f066aa427e277708a875f0cb6bcb","06f94171d32c86f72a9e1d984f2a7c3fa7bd9f00a98eabaa3fbd7d57db71aaf2","e3714293de39ce3c6e3cb9d5ea7711343b19d2be532c75504682d8ef52e8f91e","2a462314156907e42d6f0d96eed96123f1d79516aef73ed189d9f5466556b638"]
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":"de","page":"theme:vaia/billing/de","quote":"Ich habe die Antwort erhalten, dass eine Rückerstattung nicht möglich ist.","rating":1,"review_date":"2026-01-11","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.