Baseline visit v1 schema · facts legacy-derived · descriptive report

www.medicare.gov

https://www.medicare.gov/

Sep 7, 2026, 5:00 AM UTC

complete; derived from status and warnings

Scan report ready for www.medicare.gov: 214 recorded request rows.

Comparison Reportv1 schema · facts legacy-derived · descriptive report

Brave-list blocking off/on comparison

https://www.medicare.gov/ (opens in a new tab)
ShareDownloads the No blocking visit's request CSV, source report and correction context in a ZIP. Follows the evidence switcher below.PDF + evidence (opens in a new tab)Downloads a ZIP containing the PDF for every recorded visit, exact source JSON, correction context and file hashes. The scanner renders it on request.

What this actually means

medicare.gov recorded 114 fewer third-party requests in the visit configured for Brave-list blocking.

The visit with no blocking made 214 requests; the visit configured to apply Brave's ad-block engine and default Shields filter lists (a simulation in this scanner's browser, not a live Brave-browser visit) recorded 114 fewer third-party requests. The blocker directly stopped 18 requests; the remaining difference may include follow-on requests that never started once their sources were blocked, plus run-to-run variance.

9tracking-service entities
167cross-site requests
30third-party cookie records
1fingerprint-like pattern

Plain-Language Findings

What this visit means

Unfamiliar terms are defined in the glossary
playwright-chromium

Review-worthy

Bottom line: this visit has review-worthy signals

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; severity reflects fixed reference thresholds, not measured population percentiles. The request log, domain table, and methodology remain below for verification.

214 requests observed in one controlled visit.

Worth checking

52 requests matched Brave Shields filter lists

52 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 61 request rows in this visit.Show matched requests

Nothing observed

Lower values observed across comparable metrics in the Brave-list blocking attempt

With the scanner configured to apply Brave's ad-block engine and default Shields filter lists (a simulation in this scanner's browser, not a live Brave-browser visit; application was not verified), this paired visit showed 114 fewer third-party requests, 25 fewer third-party cookies and 35 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 18 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), so 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

Worth checking

2 first-party DNS aliases matched tracking checks

2 resolved targets matched Brave filter lists; those matches do not identify the operators.

The scanner followed DNS CNAME chains from first-party subdomains and checked resolved targets against the service catalog and Brave filter lists. These matches do not establish a request's purpose, profiling, or an intent to conceal tracking. A filter-list match alone is not a verified service identity or proof of tracking.

{label}.medicare.gov → {label}.{label}.gov.edgekey.net (Brave filter-list match; operator unverified) and api.medicare.gov → {label}.{label}.gov.edgekey.net (Brave filter-list match; operator unverified)Open domain evidence

Context

Tracking companies the privacy policy does not appear to name

The Trade Desk, Index Exchange and Magnite, plus 3 others were sent requests during this visit, but 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: Tealium, Google and Microsoft.

Policy at https://www.medicare.gov/privacy-policy; 0 checkable statements matched; 3 of 9 observed tracking companies named in the policy.

Review-worthy

Catalogued service domains recorded responses during this visit

Tealium, Google and The Trade Desk, plus 6 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 tag management / customer data, analytics / tag management and advertising. This scan could not identify 17 of the 37 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.

167 cross-site requests across 37 third-party hosts.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.

16 requests to these platforms.Show catalog-matched requests

Nothing observed

Google Analytics present, no remarketing signal

Google Analytics was observed, but no DoubleClick remarketing sync appeared in this visit.

Standard analytics collection was observed, without the stats.g.doubleclick.net advertising sync.

Google Analytics host observed; no stats.g.doubleclick.net request.Show catalog-matched requests

Review-worthy

Third-party cookies were present

30 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.

59 cookies total in this report.High third-party cookies count (at or above the 12 reference threshold).

Context

Input-monitoring signal involving a third-party script

Listener coverage that could observe typing-related input events was registered through call chains that included a third-party script.

This is a behavioral instrumentation signal from listener registration, stack-attributed script origins, and known-vendor requests: it shows the page was instrumented to observe interaction, not that anything was transmitted. Stack attribution records the script origins present in the bounded registration call chain; a cross-site origin in that chain does not by itself establish that the cross-site script registered the listener, because first-party code can register its own listeners through a helper served from elsewhere. A different registrable domain is also not by itself a different operator: sites commonly serve their own scripts from a separate asset domain, so the card says third party only when the catalog or reviewed ownership attributes an origin to another organization. On scanners that run the active keystroke-capture probe, actual transmission is tested separately (a synthetic value is typed, never real input, and no typed values are collected); treat this card as a review prompt rather than proof.

51 interaction-listener registrations with https://ads.nextdoor.com/, https://cdn1.adoberesources.net/ and https://*.digitalgov.gov/, plus 4 others in the registration call chain and 15 input-listener registrations with https://ads.nextdoor.com/, https://*.digitalgov.gov/ and https://*.*.qualtrics.com/ in the registration call chain

Worth checking

Offline audio rendering heuristic matched

1 behavioral heuristic matched: Offline audio rendering heuristic.

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.

1 offline render with audio.OfflineAudioContext.createAnalyser, audio.OfflineAudioContext.createDynamicsCompressor and audio.OfflineAudioContext.createOscillator, plus 1 other

Brave Shields Comparison

No blocking → Brave-list blocking delta

No blocking: 11,222msBrave-list blocking: 4,227ms
Some deltas are not comparable across these two visits and are not shown.
  • Other detector and causal-path deltas (each visit's own evidence still renders below): v1 never recorded detector versions, so fingerprinting and pixel deltas cannot be proven to come from matching instrumentation.
  • The Shields-number delta (each visit's own evidence still renders below): The two visits measured different Shields quantities (filter-list matches vs engine-blocked requests), which must never share a delta.
  • Fingerprinting deltas (each visit's own evidence still renders below): At least one visit did not complete the fingerprint measurement, so no exact cross-visit delta is shown.
  • Ad-pixel deltas (each visit's own evidence still renders below): At least one visit did not complete the pixel measurement, so no exact cross-visit delta is shown.
Requests-123No blocking: 214 · Brave-list blocking: 91
Third-party requests-114No blocking: 167 · Brave-list blocking: 53
Third-party domains-31No blocking: 37 · Brave-list blocking: 6
Cookies-40No blocking: 59 · Brave-list blocking: 19
Third-party cookies-25No blocking: 30 · Brave-list blocking: 5
Storage keys-12No blocking: 21 · Brave-list blocking: 9
Catalog-matched requests-43No blocking: 61 · Brave-list blocking: 18

Every signed change is Brave-list blocking minus No blocking. A positive or negative direction is descriptive, not a judgment that the result is better or worse.

Cookie and storage count deltas include every observation. Name-level lists show only reviewed names; unreviewed names are not itemized because they can contain identifiers.

Largest per-domain request-count changes

*.*.qualtrics.comunlabeled third partyNo blocking: 29 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-29
*.cms.govunlabeled third partyNo blocking: 20 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-20
*.adsrvr.orgThe Trade Desk · advertising / demand-side platformNo blocking: 9 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-9
*.medicare.govfirst partyNo blocking: 15 · Brave-list blocking: 7Show No blocking requests · Show Brave-list blocking requests-8
*.nr-data.netNew Relic · performance monitoringNo blocking: 6 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-6
*.*.doubleclick.netGoogle · advertisingNo blocking: 5 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-5
*.*.cognitivlabs.comunlabeled third partyNo blocking: 3 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-3
*.analytics.yahoo.comunlabeled third partyNo blocking: 3 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-3
*.bing.comMicrosoft · advertising / analyticsNo blocking: 3 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-3
ads.nextdoor.comunlabeled third partyNo blocking: 3 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-3
www.googletagmanager.comGoogle · analytics / tag managementNo blocking: 3 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-3
*.*.us-gov-pure.cloudunlabeled third partyNo blocking: 4 · Brave-list blocking: 6Show No blocking requests · Show Brave-list blocking requests+2
*.casalemedia.comIndex Exchange · advertising / exchangeNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
*.digitalgov.govunlabeled third partyNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
*.newrelic.comNew Relic · performance monitoringNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
*.pubmatic.comPubMatic · advertising / supply-side platformNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
*.tealiumiq.comTealium · tag management / customer dataNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
*.yimg.comunlabeled third partyNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
ad.doubleclick.netGoogle · advertisingNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
analytics-sm.comunlabeled third partyNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
cdn1.adoberesources.netunlabeled third partyNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
pixel.rubiconproject.comMagnite · advertising / supply-side platformNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
www.google-analytics.comGoogle · analytics / tag managementNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
www.medicare.govfirst partyNo blocking: 30 · Brave-list blocking: 29Show No blocking requests · Show Brave-list blocking requests-1
apps.*.us-gov-pure.cloudunlabeled third partyNo blocking: 24 · Brave-list blocking: 25Show No blocking requests · Show Brave-list blocking requests+1
events.launchdarkly.usunlabeled third partyNo blocking: 2 · Brave-list blocking: 1Show No blocking requests · Show Brave-list blocking requests-1
*.*.*.qualtrics.comunlabeled third partyNo blocking: 1 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-1
*.adobedc.netunlabeled third partyNo blocking: 1 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-1
*.contextweb.comunlabeled third partyNo blocking: 1 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-1
*.demdex.netAdobe · analytics / advertisingNo blocking: 1 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-1
*.google.comGoogle · advertisingNo blocking: 1 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-1
*.gstatic.comunlabeled third partyNo blocking: 1 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-1
*.nextdoor.comunlabeled third partyNo blocking: 1 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-1
*.rlcdn.comLiveRamp · identity / advertisingNo blocking: 1 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-1
fonts.googleapis.comunlabeled third partyNo blocking: 1 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-1
www.google.comunlabeled third partyNo blocking: 1 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-1

Domains only with Brave-list blocking

No domain changes observed.

Domains only with No blocking

*.*.qualtrics.comunlabeled · Show No blocking requests29
*.cms.govunlabeled · Show No blocking requests20
*.adsrvr.orgThe Trade Desk · advertising / demand-side platform · Show No blocking requests9
*.nr-data.netNew Relic · performance monitoring · Show No blocking requests6
*.*.doubleclick.netGoogle · advertising · Show No blocking requests5
*.*.cognitivlabs.comunlabeled · Show No blocking requests3
*.analytics.yahoo.comunlabeled · Show No blocking requests3
*.bing.comMicrosoft · advertising / analytics · Show No blocking requests3
ads.nextdoor.comunlabeled · Show No blocking requests3
www.googletagmanager.comGoogle · analytics / tag management · Show No blocking requests3
*.casalemedia.comIndex Exchange · advertising / exchange · Show No blocking requests2
*.digitalgov.govunlabeled · Show No blocking requests2
*.newrelic.comNew Relic · performance monitoring · Show No blocking requests2
*.pubmatic.comPubMatic · advertising / supply-side platform · Show No blocking requests2
*.tealiumiq.comTealium · tag management / customer data · Show No blocking requests2
*.yimg.comunlabeled · Show No blocking requests2
ad.doubleclick.netGoogle · advertising · Show No blocking requests2
analytics-sm.comunlabeled · Show No blocking requests2
cdn1.adoberesources.netunlabeled · Show No blocking requests2
pixel.rubiconproject.comMagnite · advertising / supply-side platform · Show No blocking requests2
www.google-analytics.comGoogle · analytics / tag management · Show No blocking requests2
*.*.*.qualtrics.comunlabeled · Show No blocking requests1
*.adobedc.netunlabeled · Show No blocking requests1
*.contextweb.comunlabeled · Show No blocking requests1
*.demdex.netAdobe · analytics / advertising · Show No blocking requests1
*.google.comGoogle · advertising · Show No blocking requests1
*.gstatic.comunlabeled · Show No blocking requests1
*.nextdoor.comunlabeled · Show No blocking requests1
*.rlcdn.comLiveRamp · identity / advertising · Show No blocking requests1
fonts.googleapis.comunlabeled · Show No blocking requests1
www.google.comunlabeled · Show No blocking requests1

Visible cookie names only with Brave-list blocking

No visible cookie-name changes to show; privacy-filtered names are not itemized.

Visible cookie names only with No blocking

MUID.bing.comthird-party
IDE.doubleclick.netthird-party
JSESSIONID.nr-data.netthird-party
receive-cookie-deprecation.rubiconproject.comthird-party
_gcl_au.medicare.govfirst-party
_uetsid.medicare.govfirst-party
_uetvid.medicare.govfirst-party

Visible storage keys only with Brave-list blocking

No visible storage-key changes to show; privacy-filtered keys are not itemized.

Visible storage keys only with No blocking

No visible storage-key changes to show; privacy-filtered keys are not itemized.

Entities only with Brave-list blocking

No entity changes observed.

Entities only with No blocking

Google5 domains13
The Trade Desk1 domain9
New Relic2 domains8
Microsoft1 domain3
Index Exchange1 domain2
Magnite1 domain2
PubMatic1 domain2
Adobe1 domain1
LiveRamp1 domain1

Measurement limits

9 conditions affect how this evidence reads

This report

  • Brave-list blocking comparison runs should be collected under matched crawl conditions, and the blocking run is a simulation with Brave's engine and default lists in this scanner's browser, not a live Brave visit. Differences can still reflect timing, experiments, cache state, consent state, or bot detection.
  • The two visits ran in randomized order; the "No blocking" visit ran first.

Both visits

  • Each visit in this report is one automated, headless Chromium visit from a fixed en-US / UTC profile, with no scrolling, clicking, or consent interaction. Sites can behave differently for real users, browsers, regions, accounts, or network locations.
  • Counts are a lower bound: trackers that load only after interaction or consent are not observed; Service Workers are blocked, and Web Worker or WebSocket traffic may be incomplete. Service labels use a US-biased hand-curated catalog, so regional services may be under-labeled. Cookie and storage figures are an end-of-visit snapshot, with storage keys read from the top frame only.
  • Read the site's privacy policy (https://www.medicare.gov/privacy-policy) and compared its text against this visit's observed behavior. Policy checks are an automated text match with the matched sentences quoted, not a legal reading.

No blocking visit only

  • The page did not reach network idle before the scan window ended.
  • Resolved 2 first-party subdomains that are CNAME aliases for third-party trackers (CNAME cloaking), which request-URL matching alone would miss.

Brave-list blocking visit only

  • Brave Shields block simulation was enabled; matching requests were aborted before loading and are not included in request totals.
  • Resolved 1 first-party subdomain that is a CNAME alias for a third-party tracker (CNAME cloaking), which request-URL matching alone would miss.

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.

Report ID
20260907-f30fe400f0321cb461f501a891f33263
Site
www.medicare.gov
Latest visit
Schema
v1 schema · facts legacy-derived · descriptive report
Verify recorded provenance

Baseline visit

Started
Run quality
complete; derived from status and warnings
Scanner
playwright-chromium
Browser
151.0.7922.34
Redaction
not recorded by this schema
Provenance
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
151.0.7922.34
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. 16 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 13 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.

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 .