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.

“Best studying app”

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)

82c3fd9378fa1eda594d11306b896ca65398918d69ce206f6e2425f1ba43f867

Signature (Ed25519, base64)

Xa6n0gnWdvfEiThtPVUU094EsC1A8nsloRl8s+xRemDUXW9i/1VPFsabIx7MyC2dFMo38wScm7haZoRNcthUCg==

Merkle root

b9a08f9d6d76dd148110a496219c42cf3205c6f982800d84d5c85d77e9461e02

Merkle path

["82c5561648a5664f43258ab1e3e84e67c1013c31df8fcb7e08b2d88c61a85b6f","e9f08c70bcc48af3b11eb2b90e41952ef863d285d66139c4321f3a64d819e426","ced4132d4c2fee5db37bccc1a941523a19c805c701739c0bcb8d826127bc6238","e2b952290efa9cbaaf1f9a16a9e67d3fca74a3aa46e4d1ffc13291bcc9e92768","cb90d6ac66b15556d14f87d95ef4c276f26ab9bd871090e77346221e3b16d583","954b7bc963d843507ad0c02521a18a80e730c38da23ce9cd744a634b305a67df","601a703b4f3c8547f50ae02b42c726240c132857fbba431f25fac03532d26a7a","4a48e4cd73aa2e3ed4acdd462e6b64cfc5690a278e45771207c94eb5d5ab643c","78f1a770d5166149836d35c29a76316264f5100bd984419d488b33d5e815fa0b","66c4ff1af10ac2b2e59d66ab919507c0e96270c6866d38265ede99ef983b9819","b12c24ca7cc480dac10d3c9e7ddd80a781d96f3b29af3e073b54d3ea0a23098b","d89f5af62fa7d0c6d0a9fe42e9680d2e7af53ca738a716457a3405d68b60cdb4","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":"en","page":"theme:vaia/quality/en","quote":"Best studying app","rating":5,"review_date":"2026-09-14","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.