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.

“Super App, praktisch, nützlich und einfach zu bedienen.”
Google Play · 5/5 · 2026-03-06

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): 5d0821f7fb8daaf79cde03ac87bd7f21f7243e64dc0f3fb65a13a48b0753ceee
Signature (Ed25519, base64): xajthlvCtIqUmADDTmXjD4XjzBCaFJkfWGyqeea8D9MikoTp3moPqZVOnSlCr8EbL2Dy7DeSNsSVTTxrTXd4AA==
Merkle root: b9a08f9d6d76dd148110a496219c42cf3205c6f982800d84d5c85d77e9461e02
Merkle path: ["5d029f33612a2d5b383da264d0155c793461181f1255e78f0f5e07b526ec5e6e","2d0667a6ee266183c3f713300b87d2993d9b029b7ec9bb8a8f55d8e122a62698","acc895df47ad806f8bbc2dfd34bbe1fea8fd8b5a22fe3c5dba97aac2f4cb2948","8a7f3a51a919cc0b0365480af49d266de3e131b593639b0a04c13069c09e8cca","f5beecd2e566becd22941790f3729bee2ed3a8495f9d1a76e627855645928d55","e47bbcccd6d85f6177e8f35bbda9ffae6b2c1de167f1185a7fdc135cafbb5c1e","4268e76a34d24b888567a964e03c418ad7d3d9b50edc58de8b21b27f34bfb756","41cde2c3e1bf44d4e80666dd33ca04ec9f9ded99c8f9964c9cadbd7c3107bf8e","e85df7e55ff9a9e6da8b0e6b2d8f26742e0a55757cd040d39cd4761cc3c729a7","8f1dbe36a4e9f53e38804d5cae08d4ee7edd5e01070f0946e6ea611eea58cef4","3ffc4d7ca09b39e0b9dadb921b06581d3652d248d7ed39418b832cb86366bd66","40bd9581780e3da9ba474021971a27a2b963126bf33adecf2de39d29e5b5c2dc","bcc0d977b8ab2060a87584efe5d0f5545e840726716d3f02c248db108122259f","6c299608515c69a03540be35865f96ca4932f3e0403f8f39fb0e1c2e2aedffb4","43a562d6822dab12c673c1efa0a3171d1ef69b949f676fb01847e1e5b56274de"]
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":"de","page":"theme:vaia/delivery/de","quote":"Super App, praktisch, nützlich und einfach zu bedienen.","rating":5,"review_date":"2026-03-06","source":"Google Play","source_url":"https://play.google.com/store/apps/details?id=com.studysmarter","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.