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.

“It lets you use photos without charging you.”

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)

ab9c8b15236a449ab01c35e01242d1f1362974431d82705b6d50ac6583cfca4f

Signature (Ed25519, base64)

hhZLsvXH78bdB3mAOBQj6XAhvMTpJZtFUvt4ZiSeDbay5nv+tc3OZgWI4JZTErqFhP43CPjzSGgmE/63nfabAg==

Merkle root

b9a08f9d6d76dd148110a496219c42cf3205c6f982800d84d5c85d77e9461e02

Merkle path

["ab9934a9296c006b63618c54f4834f51e836d5d9a09ce5683945236bf186a8af","a1dcc3cd4e8566b68ddf394f0e03211236f29bec7cd188f5694554f6346103d4","fb096f35709620cb84208327f1969bbbd740045d76b25c78759fe38e59317552","9a1ed9a2fef6e88d87a1ec3db11ad47a47d036cbddf53249de4755232e56d6fb","2fd089698ce3492c68c8412079172cc77b9dfcffe7fcd878449d8dcce468f7e6","3ce393bdba6e6025e305ca2abd3aac25b9712d227fca8a07523fb6c4d1c7ce1e","4416d6a03a385c32f1e729dbce04f060f7d333ca9b52218c026dc99a5f604a3e","fa10d1334a49e6282c69ac239ab58043ab46a02ca5746514bba98692fa920762","e25036ad7da84026131a9b4037a2c467956506702e3cf20e05a80f5a4edd8009","3182f41bb5e5b18a298a470d0dac5eb76e44e08277606d7a71dbfe71f47f05b0","302781f826e4e27dfeeb952369e37835d487d944454c4a4129ac11187f525b5a","d0e82af4a03d7591b930166e680788d40e9d0f467d2d9124361d17c683e6610b","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":"en","page":"theme:vaia/price/en","quote":"It lets you use photos without charging you.","rating":4,"review_date":"2026-09-09","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.