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.

“wenn man einen Tag nicht lernt verliert man alle Sterne”

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)

85a24578adefae1eac3f798cad9df262c081f1bd19ffc544945729c93671df50

Signature (Ed25519, base64)

OjypCnfZZ+rar9SadqSrD+Rf5MiXLgRKNCcYbJOiHxyRvmZs5noW6duEXpxWyEasPfAT9wX4t7A5UQroE+9WDg==

Merkle root

e299bf38720a5a91bdf63bbc0205245bccdf3432ab1652c69342549658b7a9ef

Merkle path

["85a380c2a48c3a43300ad0a4560005042b6bf2b47ae60aa2ec6f28b1a8a49ea4","c87c4589638439737f7f79ab2ed461af82ab6efb6c6425a73ebce391fba46625","38e3eb1ac507a78c7c551250455a9ae267a71bf43724b0c6ed064996fe5f53e9","f33e8f810fa36936ff859f81c5646d873ea6d25b026de557f04be3998d45a175","d8ba35e3dac86970f0f52c67e58aceff61424f0f6e9b20e3291d91cae8f7e07c","4a1dbc87e4043ad7bb9e6eff1c94ebd44eac860cc0b2cb1c2a569674907036fa","afd34c3d3a169eaa91badeae6cfa386ff11224edfec169a5d4bb63ef727cf3b2","f8364750fd93c81ca9205b48e8307297c07c8a95b0f0b39bd0914f2d4d47752a","0a9f8d98df3d8cdc05dab19358b15de90906f97a1cce95ac1a5b0efc31da963a","79028bf7477d9ea959b24e1ce4c142e66d00df74ce2695f9c9c3f13167063f9a","709dc8ac2ae9c9d695d9b1a159880404b1d4e87468bb02df486856103d0e19f3","9c56efa7498f22733bd81d9e1a9aa96f7fa30f782f3e2c5dc658ff683f136fda","3fdd31064998e61048d534909957bf68a4f9bbe35571f6d185756d8acc2a5420","aa4bbeb87247c2797626ab02a549451da6dfce4dcb854a36fdcc601e3e788772","bce5d442c07de6307e5ea8947098e74ce88c2246eda5e5fc1015a6d7519228a8"]

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/durability/de","quote":"wenn man einen Tag nicht lernt verliert man alle Sterne","rating":4,"review_date":"2025-08-22","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 (e299bf38720a…), 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.