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.

“update 8/21/25 - new update makes measurements impossible”
Google Play · 1/5 · 2025-08-23

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): fd8502fbd9cf43eaed97ea1c13d7325d8271b23ca6e97cdce41fb83b53ded88b
Signature (Ed25519, base64): VGz6B9YHI4YF+wRj516rLPBCVGbAxlEAo3XyVV1Z5ZeQb3NDxVNr8RHdONVukwJWPci55bB+jZtqnWGulicODw==
Merkle root: b9a08f9d6d76dd148110a496219c42cf3205c6f982800d84d5c85d77e9461e02
Merkle path: ["fd85037f7edef58df94cd9c61cbcf8b5cfa993285c34b477a02a51e544366d4f","98b857513114e43c465e9d90234110a66fc0dd32ab4b2bdf9fa3e7bfc56ee22d","febba36d949b8254b33fed69f45fad40a2aec34f5566b3240b7a155e3442ae21","81b94d31ff36dcc424646b0126b84cac3f795dcb75e7b96c454bc3c23451e739","051f6a7fc581f3a183166bfaf874fc038af0378d804d448b8300d6dfd6d201b5","b12d5b58d82bd06eadad764dd2c63af0b38cb76ba9f3b304ee0224e155f3d7bf","4daa12c9f897c8da59d86f8714103de2c5050315e7a58c93fd30930fa3aa4a61","1b501669b70335bf6f509344f8bca065e2bd74b8fc00f2584474312c0d14259d","a6dac33f29759f88532e9ccce20d18e366d68fdfe0b6a549b83653811674e4a2","db1d020a238c630184cdab8f3f46763235f4f66c0018d4563d4626cf624ecd66","f92a7fda99af63eb008476cac47b147880eec6868f847624f8b438c917195408","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:anton-paar/quality/en","quote":"update 8/21/25 - new update makes measurements impossible","rating":1,"review_date":"2025-08-23","source":"Google Play","source_url":"https://play.google.com/store/apps/details?id=com.antonpaar.homebrew","v":1}

Verify in the public log

Open the Rekor entry (pre-filled with this proof's log index).
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.
Decode spec.signature.publicKey.content from base64: it must equal Citatio's published key at /.well-known/citatio-signing.json.
The entry's integratedTime is the independent timestamp: the root, and with it this quote, existed no later than that moment.
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.