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.

“they suddenly reactivated premium access without my consent and refused the refund”

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)

71b9d5c421d3f9fbf47dfff9795523c8cf37c5d04298492034886152d7d62136

Signature (Ed25519, base64)

U2GL43xG9CGOIGztdVb+D1fAL73udWp+q1i9HpUwCbKs9bsIDmAYUNznlwBQJzysfaMAP7atVoRei8X6YKCQDA==

Merkle root

b9a08f9d6d76dd148110a496219c42cf3205c6f982800d84d5c85d77e9461e02

Merkle path

["71b9dd99e225f38fc5831bdd88710fd70efbf99920db3176ee85ddc834c0a569","2139d3b9eb1c3ac6eac386e1c51b34b396a5328db8a193fe160197827b299df9","e142062a44276a37c4fd59856f80dde180f4dcaea658d34e049f5ee7adb579db","0a5b5523b7ef436b18df0e340987c7ef332761bd5468e88ec41d17d410d0b95c","87fe7fe5f72d274bbc8468e5478829abe6529ffab4616d64613a997bc7394e65","2e85fe7ac6d50e9abb8771ae7b04d7e8017893f59cdd744756f137131c34a69c","fd846e100fe0b8c0d687655f17dcf6dff6c6ca8da139656fd51b7906b745c8c1","05ac507f02857c17043c1d9ce9f6aea9c099f47cdc3cf03a80048a5bbd7c2842","602139cd10dcff21e955a58b0c0c2b1e5e482929883fd50f3921688a0826f436","4664b9e1716770f7fa8d7f44159758ce0f7e52f6ce32aefad0bbf1ea0c72f440","16e76181c9e0c3e4486f4b7a6922be8a933d0a9c0c664aeebbf3709042661f8a","f8cfc666649943796cc64798f4b6be7235ebee26ef544e99b42bab2155b6cbad","8b252735b283ab7584d9f6925f08ed38c911c64db001463eafabe5061cb6f9fe","6c299608515c69a03540be35865f96ca4932f3e0403f8f39fb0e1c2e2aedffb4","43a562d6822dab12c673c1efa0a3171d1ef69b949f676fb01847e1e5b56274de"]

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/billing/de","quote":"they suddenly reactivated premium access without my consent and refused the refund","rating":1,"review_date":"2026-01-09","source":"Google Play","source_url":"https://play.google.com/store/apps/details?id=com.studysmarter","v":1}

Verify in the public log

1. Open the Rekor entry (pre-filled with this proof's log index).
2. 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.
3. Decode spec.signature.publicKey.content from base64: it must equal Citatio's published key at /.well-known/citatio-signing.json.
4. The entry's integratedTime is the independent timestamp: the root, and with it this quote, existed no later than that moment.
5. 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.