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

www.medicare.gov

https://www.medicare.gov/

Jul 27, 2026, 10:26 AM UTC

complete; derived from status and warnings

Public corrections ledger · SBL-CORR-2026-001

This report has a reviewed clarification

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.

Read the public review record

Scan report ready for www.medicare.gov: 235 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 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.

8tracking-service entities
172cross-site requests
25third-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.

235 requests observed in one controlled visit.

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

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 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), 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

Context

Tracking companies the privacy policy does not appear to name

The Trade Desk, Index Exchange and Magnite, plus 2 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: Google, Microsoft and Tealium.

Policy at https://www.medicare.gov/privacy-policy; 0 checkable statements matched; 3 of 8 observed tracking companies named in the policy.

Review-worthy

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.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.

22 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

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.High third-party cookies count (at or above the 12 reference threshold).

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: 14,435msBrave-list blocking: 14,373ms
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-138No blocking: 235 · Brave-list blocking: 97
Third-party requests-128No blocking: 172 · Brave-list blocking: 44
Third-party domains-29No blocking: 35 · Brave-list blocking: 6
Cookies-32No blocking: 51 · Brave-list blocking: 19
Third-party cookies-20No blocking: 25 · Brave-list blocking: 5
Storage keys-12No blocking: 21 · Brave-list blocking: 9
Catalog-matched requests-53No blocking: 53 · Brave-list blocking: 0

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: 34 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-34
*.cms.govunlabeled third partyNo blocking: 18 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-18
*.adsrvr.orgThe Trade Desk · advertising / demand-side platformNo blocking: 12 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-12
*.medicare.govfirst partyNo blocking: 25 · Brave-list blocking: 15Show No blocking requests · Show Brave-list blocking requests-10
*.nr-data.netNew Relic · performance monitoringNo blocking: 8 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-8
*.*.doubleclick.netGoogle · advertisingNo blocking: 6 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-6
www.google-analytics.comGoogle · analytics / tag managementNo blocking: 5 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-5
*.bing.comMicrosoft · advertising / analyticsNo blocking: 4 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-4
www.google.comunlabeled third partyNo blocking: 4 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-4
*.bidswitch.netunlabeled third partyNo blocking: 3 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-3
ad.doubleclick.netGoogle · advertisingNo 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
*.casalemedia.comIndex Exchange · advertising / exchangeNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
*.cdnfonts.comunlabeled third partyNo 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
analytics-sm.comunlabeled 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
*.*.*.qualtrics.comunlabeled third partyNo blocking: 1 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-1
*.adnxs.comunlabeled third partyNo blocking: 1 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-1
*.axonix.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
*.nextdoor.comunlabeled third partyNo blocking: 1 · Brave-list blocking: 0Show 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
cdn1.adoberesources.netunlabeled third partyNo 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

Domains only with Brave-list blocking

No domain changes observed.

Domains only with No blocking

*.*.qualtrics.comunlabeled · Show No blocking requests34
*.cms.govunlabeled · Show No blocking requests18
*.adsrvr.orgThe Trade Desk · advertising / demand-side platform · Show No blocking requests12
*.nr-data.netNew Relic · performance monitoring · Show No blocking requests8
*.*.doubleclick.netGoogle · advertising · Show No blocking requests6
www.google-analytics.comGoogle · analytics / tag management · Show No blocking requests5
*.bing.comMicrosoft · advertising / analytics · Show No blocking requests4
www.google.comunlabeled · Show No blocking requests4
*.bidswitch.netunlabeled · Show No blocking requests3
ad.doubleclick.netGoogle · advertising · 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
*.cdnfonts.comunlabeled · 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
analytics-sm.comunlabeled · Show No blocking requests2
pixel.rubiconproject.comMagnite · advertising / supply-side platform · Show No blocking requests2
*.*.*.qualtrics.comunlabeled · Show No blocking requests1
*.adnxs.comunlabeled · Show No blocking requests1
*.axonix.comunlabeled · Show No blocking requests1
*.demdex.netAdobe · analytics / advertising · Show No blocking requests1
*.google.comGoogle · advertising · Show No blocking requests1
*.nextdoor.comunlabeled · Show No blocking requests1
*.qualtrics.comunlabeled · Show No blocking requests1
cdn1.adoberesources.netunlabeled · Show No blocking requests1
fonts.googleapis.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
_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 domains18
The Trade Desk1 domain12
New Relic2 domains10
Microsoft1 domain4
Index Exchange1 domain2
Magnite1 domain2
PubMatic1 domain2
Tealium1 domain2
Adobe1 domain1

Measurement limits

8 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.
  • The page did not reach network idle before the scan window ended.
  • This scan typed a synthetic test value into 1 form field (never submitting the form) to test whether typed input is captured and sent to third parties. The value is synthetic and is not stored. Requests the page sent during and after this typing, including any unload beacons, are part of the recorded request log and counts.
  • 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.

Brave-list blocking visit only

  • Brave Shields block simulation was enabled; matching requests were aborted before loading and are not included in request totals.

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
20260727-7f69d9e7baa6825ac7f3c9ae39c2e70c
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
149.0.7827.55
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
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. 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 .