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.

“I'm almost mad that Fastmail is so good”

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 3666503969

Proof data

Record hash (SHA-256)

1e21f5f0f367ce6c076a69697b0f680f4a74fcdb3d0240ae04da5f5446b3ad56

Signature (Ed25519, base64)

FDqiKlE/P2vAxZilpDwqa6PVv44oqc02nyXU4YcswPszHpvt4fGOGthtGjFdcINdt9FONG3exh2Lqxs9fC56AA==

Merkle root

7fcf639a7573b11c0c63296f1f4cad9d82711469135561c27b140b3f8cf0f233

Merkle path

["1e217829f5ec72eafb2d60f85e0c6bbdd9740fe18da6b92a679524ce5afcdbd6","66c1732455c5bf32fcf07a7b98f2a44d84a3112f030abcb021191bbee07adf10","0687cd30089ca7ea9336e4cfd9a5c1c8adf187a8eb8b1cc69f0747e412dd71c5","16822bf405805d6ee20f2ff67c4090ab22543dc0cb349478deb0291c8f7748de","e48af6b089445bcdfecc7ef3d2017fecdcf294dfe7726afbd58b62b3b836e4e5","0846e9d44ec64c19c8c08a61f708d1ff308c3ffa8eece90ba8ff01e3132634b3","7563bb2f111e973edf1219c9b97dc3a9e49404dee650e0bf8175f412cd88fd9b","28707443efc9ca941bb7a31015e889a66beb15ca02f51bb227ca713a3eb1587a","ab39a169fa1005d37170ebc5eed08e3c7d3531d148efa7db2fda4c1a005680f8","8a633b07599328cf8ed191c20d5874d05db66c6ecc72ba64c742b13d89a02e66","07b09ead5e3200c1b520970718a379d46d297e4c0f0f99a01dde8b4b2e5e882d","c4613c89731736364f3f3856f24ef3babe183ce20545df5fbb70ac024301ebc7","b978843be08c52cb951ca064b6ce98b7a05b3bb460ac7b4bd5d1657a0d8a155a"]

Anchored

2026-11-03

Public log entry

search.sigstore.dev, log index 3666503969 · entry 108e9186e8c5677a89d4…

Expected log hash

8f203023a4c26e044b3b27e73dbe1466d2f19b715af45abb5c7e82ddfacac0ea 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":"v1793701411816","kind":"published-quote","locale":"en","page":"brand:fastmail","quote":"I'm almost mad that Fastmail is so good","rating":5,"review_date":"2026-08-25","source":"Apple App Store","source_url":"https://apps.apple.com/us/app/id931370077?see-all=reviews","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 (7fcf639a7573…), 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.