SBL-CORR-2026-001: The historical input-probe disclosure overstates coverage. Unload-only transmissions were not reliably recorded. Focus and blur handlers could run, and per-field failures were not fully counted. These reports cannot establish absence of input transmission outside their retained observations.
medicare.gov recorded 128 fewer third-party requests in the visit configured for Brave-list blocking.
SBL-CORR-2026-001: The historical input-probe disclosure overstates coverage. Unload-only transmissions were not reliably recorded. Focus and blur handlers could run, and per-field failures were not fully counted. These reports cannot establish absence of input transmission outside their retained observations.
Bottom line: this visit has signals worth checking
The scan observed signals a non-expert should not have to decode from raw request tables.
The cards below translate the evidence into plain language. Where a measured distribution exists, severity ranks this visit against percentiles from this report's cohort, with each percentile card naming its metric-specific measured-site denominator; otherwise it uses fixed reference thresholds. That cohort is drawn from a curated set of popular, mostly commercial sites, not a random sample of the web. The request log, domain table, and methodology remain below for verification.
235 requests observed in one controlled visit.
What was checked
Page
https://www.medicare.gov/
When
Jul 27, 2026, 10:26 AM UTC
Setup
Both visits used headless Chromium in a desktop window of 1440 × 980, with en-US language and UTC time zone. Both ran from a GitHub Actions Ubuntu runner; the network region was not recorded. Neither sent the Global Privacy Control (GPC) signal.
Visits
Two visits configured to differ in Brave-list blocking: No blocking and Brave-list blocking.
Interactions
Typed a made-up test value into 1 form field in each visit, never submitting the form. No scrolling, clicking or consent interaction.
Outcome
Both visits completed.
What these visits could not see
Other pages on this site. Only the requested page's activity was recorded. The privacy policy was opened only to read its text, and none of its activity was recorded.
Signed-in visitors, other browsers and other regions. Both visits were automated, from a fixed en-US / UTC profile. Sites can behave differently for real users, browsers, regions, accounts, or network locations.
Anything that loads only after interaction or consent. Trackers that load that late are not observed, so counts are a lower bound.
Services the catalog does not name. Service labels use a US-biased hand-curated catalog, so regional services may be under-labeled.
Worth checking
58 requests matched Brave Shields filter lists
58 requests matched the default filter lists of Brave Shields, the ad and tracker blocker built into the Brave browser, while loading normally.
Computed with Brave's own ad-block engine and default filter lists in classification mode: matched requests were not blocked by the scanner and remain in this report's observed request counts. Matching shows what Shields would target on this visit's traffic. An actual Shields visit blocks these and also prevents their follow-on requests, so this number is neither a measured block count nor the total effect.
The hand-curated service catalog separately matched 53 request rows in this visit.Show matched requests
Not flagged
Lower values observed across comparable metrics in the Brave-list blocking attempt
The blocking visit ran with the scanner configured to apply Brave's ad-block engine and default Shields filter lists. It was a simulation in this scanner's browser, not a live Brave-browser visit, and application was not verified. Compared with the unblocked visit, it showed 128 fewer third-party requests, 20 fewer third-party cookies and 43 fewer tracking-related service requests.
Services only seen in the unblocked visit: Google, The Trade Desk and Microsoft, plus 5 others. The blocking visit's engine directly blocked 15 requests; the remaining difference may include follow-on requests that never started once their sources were blocked. A single paired comparison can also reflect run-to-run variance (ad rotation, caching, experiments). Treat this as an observed difference, not a measured blocking rate.
Signed per-metric differences between the two visits; nothing is summed across metrics.Show matched requests
Context
Tracking companies the privacy policy does not appear to name
The Trade Desk, Index Exchange and PubMatic, plus 1 other were sent requests during this visit. However, the policy text matched none of the names this scan knows those companies by.
Policies often disclose vendor categories rather than company names, so an unnamed vendor is a transparency gap worth reviewing, not automatically a violation. Named in the policy: Google, Microsoft and Tealium.
Policy at https://www.medicare.gov/privacy-policy; 0 checkable statements matched; 3 of 7 observed tracking companies named in the policy. Policy mentions of Magnite are unknown because the historical alias matcher was incomplete.
Opens the request log at its catalog-matched rows, which include the requests to the companies this card names.
Worth checking
Catalogued service domains recorded responses during this visit
Google, The Trade Desk and Microsoft, plus 5 others appeared in the request log.
A catalog match identifies a maintainer-reviewed service/domain mapping; it does not establish why an individual request occurred, what it carried, or whether profiling happened. Functional catalog labels include analytics / tag management, advertising and advertising / demand-side platform. This scan could not identify 18 of the 35 third-party hosts recorded here, so it cannot say who operates them. That is a limit of identity coverage, not evidence about the site. The role taxonomy assigns these additional services explicitly non-tracking operational, support, security, consent-management, or hosting roles: New Relic.
172 cross-site requests across 35 third-party hosts.At or above the 75th-percentile mark for third-party domains across the 56 sites measured for this metric. Elevated distinct tracking-service entities count (at or above the 6 reference threshold).Show third-party requests
Context
Requests were dispatched to catalogued major-platform domains
This visit dispatched requests to catalogued domains for Google and Microsoft.
The domain matches identify services, not the requests' purpose, payload, or whether any profile linking occurred.
25 third-party cookies showed up during the visit.
The scanner observed cookie metadata whose domain crossed the scanned site's registrable-domain boundary. This report does not retain cookie values or partition keys, so it does not establish whether a cookie was a persistent identifier or could recognize a visitor across sites.
51 cookies total in this report.At or above the 75th-percentile mark for third-party cookies across the 56 sites measured for this metric.
These heuristics look for behavior patterns such as canvas readback after drawing, repeated canvas font measurement, WebGL entropy reads, offline audio rendering, or WebRTC peer-connection setup. They are review prompts for this visit, not proof of cross-site identity tracking.
Offline audio rendering heuristic: 1 offline render with audio.OfflineAudioContext.createAnalyser, audio.OfflineAudioContext.createDynamicsCompressor and audio.OfflineAudioContext.createOscillator, plus 1 other.
Raw evidence
Open the interactive evidence explorer
The findings above are built from the stored report. Load the request rows, domains, cookies, storage keys, browser signals, visit phases, charts and CSV export when you want to check them; the versioned report JSON is always available below without this interface.
This versioned report is currently retained in the public corpus. Follow the currently retained site history, repeat the same public route when it is available, or request a transparent evidence correction.
Exact build and instrument digests were not recorded by this legacy schema.
Variant visit
Started
Run quality
complete; derived from status and warnings
Scanner
playwright-chromium
Browser
149.0.7827.55
Redaction
not recorded by this schema
Provenance
Exact build and instrument digests were not recorded by this legacy schema.
Recorded provenance is self-reported measurement metadata, not a cryptographic attestation. The public versioned report JSON contains the retained public evidence; see the methodology for interpretation and retention limits.
This report covers what the scanner measures, not everything a site can do. 17 browser surfaces are not instrumented at all (Every page except the one that was scanned; Anything that only loads after scrolling or interaction; Why a request happened, as a causal chain; and 14 others), 3 capabilities are declined by policy, and 3 are outside what any single visit can see. Their absence from this report is not evidence that they did not occur. Read the published coverage boundary.
Detector accuracy is unmeasured. No calibration study currently publishes a precision or recall for the detectors on this page, so a detector match here is a recorded observation, not a calibrated classification. How detector accuracy is measured.
Severity percentiles come from this report's exact schema, methodology, tracker-catalog, ServiceRole-taxonomy, metric-contract, producer, and Global Privacy Control cohort. Each percentile card's measured sites are among 99 sites with a successful load across all cohorts. Other methodologies, request-capped visits, and post-choice consent visits are excluded from each card's denominator, while failed or block-page attempts are outside that coverage.
Approved use boundary: This report is investigative evidence that requires independent corroboration. It is not a standalone legal determination and not the sole exhibit in a legal proceeding. Recorded in this project's release manifest on .