{
  "log_key": "ct.googleapis.com/logs/eu1/xenon2026h2",
  "description": "Google 'Xenon2026h2' log",
  "operator": "Google",
  "checkpoint_url": "https://ct.googleapis.com/logs/eu1/xenon2026h2/ct/v1/get-sth",
  "checkpoint_format": "ct_v1_sth",
  "signature_scheme": "ecdsa_p256_ct_v1",
  "key_source_url": "https://www.gstatic.com/ct/log_list/v3/log_list.json",
  "limbs": {
    "log_listed_in_a_public_list": {
      "outcome": "ok",
      "listed_in": "Google Chrome CT log list v3"
    },
    "public_key_obtained_independently_of_the_log": {
      "outcome": "ok",
      "key_source": "https://www.gstatic.com/ct/log_list/v3/log_list.json"
    },
    "checkpoint_endpoint_answers_without_credentials": {
      "outcome": "ok",
      "status": 200,
      "bytes": 241
    },
    "checkpoint_parses_in_its_declared_format": {
      "outcome": "ok",
      "format": "ct_v1_sth"
    },
    "checkpoint_carries_tree_size_and_root_hash": {
      "outcome": "ok",
      "tree_size": 1922271995,
      "root_hash": "4b45af0dfa81a46aa52b5d2ec3eb20278b1fec9a6031bb2890fcbee08cde47a8"
    },
    "checkpoint_carries_a_signature": {
      "outcome": "ok",
      "signature_lines": 1
    },
    "signature_scheme_supported_by_this_monitor": {
      "outcome": "ok",
      "scheme": "ecdsa_p256_ct_v1"
    },
    "signature_verifies_against_the_published_key": {
      "outcome": "ok",
      "scheme": "ecdsa_p256_ct_v1"
    },
    "checkpoint_carries_witness_cosignatures": {
      "outcome": "fail",
      "reason": "checkpoint_carried_no_signature_beyond_the_log_own",
      "attribution": "publisher",
      "note": "A Certificate Transparency signed tree head has no place to carry a witness cosignature, so this is a fact about the format as much as about the log."
    },
    "prior_batch_checkpoint_on_record": {
      "outcome": "ok",
      "prior_read_at": "2026-08-02T05:34:38.631195+00:00",
      "prior_tree_size": 1922213339
    },
    "second_read_answered": {
      "outcome": "ok",
      "tree_size": 1922279015
    },
    "tree_did_not_shrink_between_reads": {
      "outcome": "ok",
      "first_size": 1922271995,
      "second_size": 1922279015,
      "entries_added": 7020
    },
    "consistency_proof_served": {
      "outcome": "ok",
      "nodes": 24
    },
    "consistency_proof_recomputes_to_the_second_root": {
      "outcome": "ok",
      "reason": "both_roots_recomputed",
      "first_size": 1922271995,
      "second_size": 1922279015,
      "proof_nodes": 24
    }
  },
  "evidence": {
    "first_read": {
      "url": "https://ct.googleapis.com/logs/eu1/xenon2026h2/ct/v1/get-sth",
      "status": 200,
      "error": null,
      "bytes": 241,
      "read_at": "2026-08-02T05:42:46.901265+00:00",
      "body_sha256": "a3609914f6a6016981d81db0ab5b4b16ebf406209a470b3d6c083c96a45d1d60",
      "parsed": true,
      "format": "ct_v1_sth",
      "tree_size": 1922271995,
      "timestamp": 1785649306467,
      "signature_lines": 1,
      "root_hash_hex": "4b45af0dfa81a46aa52b5d2ec3eb20278b1fec9a6031bb2890fcbee08cde47a8",
      "raw_body": null
    },
    "signature_check": {
      "supported": true,
      "verified": true,
      "scheme": "ecdsa_p256_ct_v1"
    },
    "prior_batch": {
      "log_key": "ct.googleapis.com/logs/eu1/xenon2026h2",
      "read": "second_read",
      "read_at": "2026-08-02T05:34:38.631195+00:00",
      "tree_size": 1922213339,
      "root_hash": "c87bbd9f83746bc65b83e577aacbe98232b34c1b2597bf9f5c54a3e0ce9636b8",
      "body_sha256": "e242ed56e00e9ba3516d450d10740840ff601de17b9158716659f3eb1a3b753d"
    },
    "second_read": {
      "url": "https://ct.googleapis.com/logs/eu1/xenon2026h2/ct/v1/get-sth",
      "status": 200,
      "error": null,
      "bytes": 245,
      "read_at": "2026-08-02T05:43:46.181677+00:00",
      "body_sha256": "954baf2b0518d3b5c9dfb8b1a6b4fca85172c8152306da598c3fe6fde60bb5e1",
      "parsed": true,
      "format": "ct_v1_sth",
      "tree_size": 1922279015,
      "timestamp": 1785649365793,
      "signature_lines": 1,
      "root_hash_hex": "9124d5bf7fbd9d487451680742fb524adf1e9eae5ecd2ac9c4503b01c0b23c58"
    },
    "consistency_request": {
      "served": true,
      "url": "https://ct.googleapis.com/logs/eu1/xenon2026h2/ct/v1/get-sth-consistency?first=1922271995&second=1922279015",
      "proof": [
        "ac11bef5753758bcc9b7007446b22e6fb42eac15bb9d87b7b605bc9a84568ffe",
        "958082824b3acff957b26ce8abe1398781412c6a9e908087df2089cf627ba647",
        "3a2abc8599811cd2008df6ea205c320ae42f787beaf43fd995ed1830eeb0eaed",
        "382a2870aab2c80cb59b4902e4877dcd01f57b391454396335ffb7647a8a0eaf",
        "16d97ae4c7aad39457ab65bdf3a564bb559133db61f94a565c32fc1afcdbcafb",
        "667a68451ec5af9099a06c6e6c4e3d4a6a55a88dc03f0fcb7b185d805e763112",
        "180d8f91c754656c395245f3e6c65b904ef4a9c96e7c601960013d6455ca5413",
        "9990d54fd5a57114f69a9284c08e0ca0ae91165c62d6235c2f8fcd3db7840f6f",
        "ee9605b6c5b69e4b702db62310ba73ae89d80bb34fa40a453faba28bdaa18b1e",
        "303befcbf06515eb5122ecd90dca26bc25b019e28f27352a2af506398ae7ded1",
        "8e9dc9bb1a5c6202bc2e6549cdcc80c1615b95943dcdbb76935d260fe15b42af",
        "6acc4c108adb4098e84b1a21ff843ab8e98f81d5c0d7b6be3eaf760faab6417c",
        "4b9ab3cb5075d3d2d15af99910e71f3d5b775e3ba655d11e717b1f8a344dc6c3",
        "6a2b6b0391d33314804a970dd2c6975939334780ed564921bbbdac62a5b3f5ee",
        "43b33941f166633410a060ca5bf8a69a4cd72c546f19d0b3dd97bd38cc8a4248",
        "bdd2764a62d86db096ed8f263be6d1ae746e9da3dc047f71487b882f30782d24",
        "3e6ee733c49176c8aab58b70014eb6e9ed0d98218f27d961b4906e3e4d74fe37",
        "87aa6c6d15d21e909559f88b06a5b0df8e872e8281c3d1ca0d209fe2f00240d3",
        "6cc43609e46b3c29f11a1b792e58d10c0b64ecb57d35f9c44eb6b6d4ce2c1909",
        "25bd9d3418d108dbf6052d66163d4eb78af50a4c5a04e4311c6f5cf7d1ce2a00",
        "3ad045d90ee2a3d3c46edba8848010c3be6e9996f7526f49b6e3bd889351094c",
        "93b7d19b89eaf86a999e37670bfc93dd3cc2d28f3974b131bf3f4645680e0c38",
        "522d360d1728fe7112c591f9b6c5d1bd4b9abca1c0a23b1d8f7a61d959105196",
        "3fd2f0b4a327b9bd6dac1546ba6a55ed92286c62dc345ea2d559fbaf3871c0a0"
      ],
      "nodes": 24
    }
  },
  "tree_advanced_between_reads": true,
  "entries_added_between_reads": 7020,
  "checked_at": "2026-08-02T05:43:57.759008+00:00",
  "must_admit": true,
  "full_admit": true,
  "refuse_limb": null,
  "refuse_reason": null,
  "attribution": null,
  "must_limbs_failed": [],
  "should_limbs_failed": [],
  "receipt_filename": "ct.googleapis.com_logs_eu1_xenon2026h2.json",
  "ledger": "https://geniusflow-federation.vercel.app/tlog/ledger.json",
  "ledger_digest": "1e9ae859e742abe6cfb6dabb7e5d337cba88d3f3cc0715ceb8a5a9bdc3821603",
  "expectations_digest": "78cb2f5444df2da26462e17070ab9e421ae85b30a8ec1ed672ea21cddeb34290"
}