{
 "metric": "cert-trust",
 "segment": "gb-companies",
 "anchor": "company",
 "label": "UK companies",
 "population": "UK companies",
 "states": [
  "ok",
  "hostname_mismatch",
  "self_signed"
 ],
 "quiet_failure_states": [
  "hostname_mismatch",
  "self_signed"
 ],
 "measurement": "Tier 2; compare issuer/subject and check the SAN list covers the host. Denominator: `has_web`.",
 "why_it_matters": "HTTPS is present, the port is open, TLS negotiates — and every visitor gets a browser warning, or would if they checked. Encryption without authentication.",
 "limits": null,
 "data_tier": "tls",
 "population_predicate": "has_web",
 "entity_type": "domain",
 "kind": "failure",
 "latest": {
  "day": "2026-08-12",
  "n": 2041,
  "qf_pct": 11.02,
  "ci": [
   9.74,
   12.46
  ],
  "dist": {
   "ok": 88.98,
   "hostname_mismatch": 8.97,
   "self_signed": 2.06
  },
  "snapshot": "uk-companies-house-per600-seed20260728"
 },
 "series": [
  {
   "day": "2026-08-01",
   "n": 1001,
   "qf_pct": 9.99,
   "ci": [
    8.28,
    12
   ],
   "dist": {
    "hostname_mismatch": 7.69,
    "self_signed": 2.3,
    "ok": 90.01
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-03",
   "n": 1021,
   "qf_pct": 10.28,
   "ci": [
    8.57,
    12.3
   ],
   "dist": {
    "ok": 89.72,
    "hostname_mismatch": 7.84,
    "self_signed": 2.45
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-04",
   "n": 2038,
   "qf_pct": 11.09,
   "ci": [
    9.8,
    12.53
   ],
   "dist": {
    "ok": 88.91,
    "hostname_mismatch": 8.83,
    "self_signed": 2.26
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-05",
   "n": 2038,
   "qf_pct": 10.99,
   "ci": [
    9.71,
    12.42
   ],
   "dist": {
    "ok": 89.01,
    "hostname_mismatch": 8.83,
    "self_signed": 2.16
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-12",
   "n": 2041,
   "qf_pct": 11.02,
   "ci": [
    9.74,
    12.46
   ],
   "dist": {
    "ok": 88.98,
    "hostname_mismatch": 8.97,
    "self_signed": 2.06
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  }
 ],
 "license": "CC BY 4.0",
 "source": "https://quietfailures.com/datasets/cert-trust/gb-companies"
}