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.

“Mandatory registration for an email client..”

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 3668793196

Proof data

Record hash (SHA-256)

0563272967b6954cc2fe6ca9aa3a03b855c53df88a83e2e3460a89a903317af4

Signature (Ed25519, base64)

oLoEdnI2+9PHpU0OxN2xthDLEplrvZ0weoFPvKv11B06/ox3y2aQvfX2bxXIQJbiPTf6xgnZrGX1mJjeIk8EAw==

Merkle root

8552de27836d9c1d73f2670cf2bc11df6459e7443d47ace4674278484e3a6d8e

Merkle path

["056d5cab83a24f2cde118637bf7bc169b5884ef0b63314541dc1f8eae9795c68","535fe462d7b737353cd1e9317d677aefe23d31c133511b29e58de6987f8863ea","bb1842fbcaeec0dad7e733f971840acd4a442a3e572e60431703966163f1af52","ec04d71eec0d67424aa01c2094a7ddba6e0433c0630478e8e7782c8d9742e70d","5f8f02dbcca5c14a1af147bbd4d72624dcabac00ec5de50045516ce04b09228b","59f854b4582ee8b2fd97ed6e4d51374d1f6f200ed8638ff06ec622a89c913db5","6f18d9e280a960c71117f1833bb169a1f300eebf5c5f3f7fc17ea8aa41b1c8ca","f9f1e27e94b9d3dff8d4c6654793298f0fed8fd2008ac47a7c9b35568011246f","05a0133faae5b41888fa08b9ab118800c7ee3f00b79ac5bcfc95749160affae3","7835ca71fdfea746279b7644da599f2720670e215fe623045002700f11ed5642","4f17a7ed38c98f7a470320811cda3089cdb974f325cd6f8590ff2ad504addacf","521a2de35e4b98beb07bc39254cf192902ab2b5298a659e0538f167d5630eb48","06f625e80da47a14c2d3e7027b88f7f89c63e459e05ddda58b98e60b36bc2518"]

Anchored

2026-11-03

Public log entry

search.sigstore.dev, log index 3668793196 · entry 108e9186e8c5677a8c91…

Expected log hash

f099839a063ebfd0b66050d615b9645cca5be77075ecec449f1aa0148fdcbfea 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":"v1793706932685","kind":"published-quote","locale":"en","page":"brand:proton","quote":"Mandatory registration for an email client..","rating":1,"review_date":"2026-08-12","source":"Google Play","source_url":"https://play.google.com/store/apps/details?id=ch.protonmail.android","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 (8552de27836d…), 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.