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.

“Beide Geräte und Apps immer up to date.”

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 2514851395

Proof data

Record hash (SHA-256)

ffd28fd5e643d6e9d2adca2998a5167099640b9f6f86ada208bf63a50c7a9836

Signature (Ed25519, base64)

ytqSkC2Yr97nBfKxRUpoiv+h6INC4Yx4E2bnlueSO33Jut7FVkI+Nf0SnH0+pMRKkHLq7ZfxmL6fXXp0BAA0Bw==

Merkle root

b6da35820db152d3d2c0cee337545e3489f0422a146fcc8c60737b1d3a3ef55c

Merkle path

["ffd05c97ac7d4a02efa6ab91b7b042fc33d5a7f657970c706050d1d93a465917","54171e5b45dbc72a9ef4c39a93c055ad4047da5435ed951550c0bb1786ec4a77","5438b07573751295aaf2b35598f0c9f61536829c333b9784384bd95254b81fce","08d69651b9489ca0e274323020730b2e81cb9d9ad2ba1e08b7102aac267b491c","81b6fc09e1045bfb8c290b1dbeebf87e0613f80413ec30c3edf91230838b9430","16f5a0d302b78b31f8a00d6474943048901a393308d0e534f5c6c4b5d321d6c9","b81a6a76e20c85c9201e8adc0859e7f32eba913e9674220179c0575595b46601","60351b296c3f0cdc9c74e20c0e3a362ee857779e4467a9cfcea9b6896ac8ca5d","a8282421557f9d85614ee1b5a1f241c33c8aac2a633d3016cee1e09bddc59394","957170d24ca01d7b90994df4a844f8fda61c784f04299f7c012a09472fc9f802","4ead2e48718cf6823c15813aaf31284c132ede1f0bf5c465ab4c472e9d95cabd","224859803387e2d5d55f4d99200baf1853b57ca9280b91ad0b25d9ec06abb7dc"]

Anchored

2026-08-19

Public log entry

search.sigstore.dev, log index 2514851395 · entry 108e9186e8c5677a4f62…

Expected log hash

687a04ce8b1c63a953fd353f279012a3ef08c4ad12d885582b1b6ee85d05b900 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":"v1787134378129","kind":"published-quote","locale":"de","page":"brand:threema","quote":"Beide Geräte und Apps immer up to date.","rating":2,"review_date":"2026-08-06","source":"Google Play","source_url":"https://play.google.com/store/apps/details?id=ch.threema.app","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 (b6da35820db1…), 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.