Baseline visit Older format: some facts reconstructed, descriptive only

www.costco.com

Requested addresshttps://www.costco.com/

Oct 19, 2026, 11:15 AM UTC

cut short: the synthetic form-input probe did not complete its test, so input-capture detection is incomplete; derived from status and warnings

View site historyScan this exact route againReport an evidence problem

Evidence quality

This report is built on an incomplete visit

Incomplete evidence: evidence was cut short before completion (the synthetic form-input probe did not complete its test, so input-capture detection is incomplete). Counts for the affected evidence are lower bounds; families that completed carry only their ordinary limits. The evidence receipt states the exact per-visit quality.

Comparison ReportOlder format: some facts reconstructed, descriptive only

Brave-list blocking off/on comparison

Recorded final address https://www.costco.com/
SharePDF + evidence

What this actually means

costco.com sent synthetic form input to 1 cross-site domain before submission.

The scanner's unique test value appeared in requests to *.*.dynatrace.com without form submission. The report does not establish whether transmission happened during typing, blur, or unload, why it was sent, or whether real visitor input follows the same path.

2tracking-service entities
51cross-site requests
2third-party cookie records
Observed in two automated visits: evidence to check, not a verdict.
Post on X

Plain-Language Findings

What this visit means

Unfamiliar terms are defined in the glossary
playwright-chromium

Worth checking

Bottom line: this visit has review-worthy signals

The scan observed signals a non-expert should not have to decode from raw request tables. Some detector evidence was incomplete; each affected detector card states its own retained or unavailable scope, while completed request, cookie, and storage measurements keep their recorded exactness.

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.

299 requests observed in one controlled visit.

Worth checking

41 requests matched Brave Shields filter lists

41 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 23 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 50 fewer third-party requests, 2 fewer third-party cookies and 23 fewer tracking-related service requests.

Services only seen in the unblocked visit: Adobe and Criteo. The blocking visit's engine directly blocked 4 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

Synthetic form input reached 1 cross-site domain before submission

When the scanner typed a unique test value into 2 form fields, that value appeared in requests to *.*.dynatrace.com (plain) without the form being submitted.

The synthetic value appeared in a recoverable form (plain). The report does not establish whether transmission happened during typing, blur, or unload, why it was sent, or whether real visitor input follows the same path. The scanner types only synthetic values and never submits the form.

Synthetic test value appeared in requests to *.*.dynatrace.com via plain.

Worth checking

1 first-party DNS alias matched tracking checks

Recorded DNS aliases resolve to catalogued tracking-related services: Adobe.

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.

*.costco.com → *.*.*.*.omtrdc.net (Adobe; catalog match)Open domain evidence

Context

Tracking companies the privacy policy does not appear to name

Adobe and Criteo 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.

Policy at https://www.costco.com/…/privacy-policy; 0 checkable statements matched; 0 of 2 observed tracking companies named in the policy.

Context

Catalogued service domains recorded responses during this visit

Adobe and Criteo 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 / advertising and advertising. This scan could not identify 10 of the 14 third-party hosts recorded here, so it cannot say who operates them. That is a limit of identity coverage, not evidence about the site.

51 cross-site requests across 14 third-party hosts.Show third-party requests

Not flagged

No requests to major-platform domains were recorded

No requests to catalogued Google, Meta, TikTok, X, Microsoft, LinkedIn, or Pinterest domains were observed in this visit.

Major-platform domains were not observed in this single passive visit; interaction-gated requests could still load for real users.

14 cross-site domains seen overall.Show catalog-matched requests

Not flagged

No Google Analytics observed

This visit did not contact Google Analytics.

Neither Google Analytics nor its remarketing sync was observed in this visit.

No google-analytics.com or googletagmanager.com requests.Show catalog-matched requests

Context

Third-party cookies were present

2 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.

26 cookies total in this report.Modest third-party cookies count.

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. That is 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. The card therefore 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.

Session-recording listener coverage: 59 interaction-listener registrations with https://assets.adobedtm.com/, https://cdn.intake-lr.com/ and https://*.dynatrace.com/ in the registration call chain. Input-monitoring listener coverage: 33 input-listener registrations with https://cdn.intake-lr.com/, https://*.dynatrace.com/ and https://transcend-cdn.com/ in the registration call chain.

Not flagged

No fingerprint-like API calls observed

The scan did not observe the instrumented high-entropy browser APIs.

This is an observation layer, not proof that fingerprinting is impossible.

0 API families recorded.

Brave Shields Comparison

No blocking → Brave-list blocking delta

No blocking: 18,747msBrave-list blocking: 45,004msRan first: Brave-list blocking
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-164No blocking: 299 · Brave-list blocking: 135
Third-party requests-50No blocking: 51 · Brave-list blocking: 1
Third-party domains-13No blocking: 14 · Brave-list blocking: 1
Cookies-19No blocking: 26 · Brave-list blocking: 7
Third-party cookies-2No blocking: 2 · Brave-list blocking: 0
Storage keys-31No blocking: 37 · Brave-list blocking: 6
Catalog-matched requests-23No blocking: 23 · 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

www.costco.comfirst partyNo blocking: 151 · Brave-list blocking: 76Show No blocking requests · Show Brave-list blocking requests-75
*.costco.comfirst partyNo blocking: 97 · Brave-list blocking: 58Show No blocking requests · Show Brave-list blocking requests-39
assets.adobedtm.comAdobe · analytics / advertisingNo blocking: 14 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-14
*.*.dynatrace.comunlabeled third partyNo blocking: 9 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-9
*.*.criteo.comCriteo · advertisingNo blocking: 4 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-4
*.criteo.comCriteo · advertisingNo blocking: 4 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-4
static.queue-it.netunlabeled third partyNo blocking: 4 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-4
*.cdndex.iounlabeled third partyNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
*.dynatrace.comunlabeled third partyNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
*.intake-lr.comunlabeled third partyNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
assets.queue-it.netunlabeled third partyNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
cdn.intake-lr.comunlabeled third partyNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
transcend-cdn.comunlabeled third partyNo blocking: 2 · Brave-list blocking: 0Show No blocking requests · Show Brave-list blocking requests-2
*.costco-static.comunlabeled third partyNo blocking: 2 · Brave-list blocking: 1Show 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
cloudflare.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

assets.adobedtm.comAdobe · analytics / advertising · Show No blocking requests14
*.*.dynatrace.comunlabeled · Show No blocking requests9
*.*.criteo.comCriteo · advertising · Show No blocking requests4
*.criteo.comCriteo · advertising · Show No blocking requests4
static.queue-it.netunlabeled · Show No blocking requests4
*.cdndex.iounlabeled · Show No blocking requests2
*.dynatrace.comunlabeled · Show No blocking requests2
*.intake-lr.comunlabeled · Show No blocking requests2
assets.queue-it.netunlabeled · Show No blocking requests2
cdn.intake-lr.comunlabeled · Show No blocking requests2
transcend-cdn.comunlabeled · Show No blocking requests2
*.demdex.netAdobe · analytics / advertising · Show No blocking requests1
cloudflare.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

ajs_anonymous_id.costco.comfirst-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

ajs_anonymous_idlocal storage

Entities only with Brave-list blocking

No entity changes observed.

Entities only with No blocking

Adobe2 domains15
Criteo2 domains8

Measurement limits

10 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 "Brave-list 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 synthetic form-input probe did not complete its test, so input-capture conclusions for this visit are incomplete.

No blocking visit only

  • This scan typed a synthetic test value into 2 form fields with native form submission blocked. Focus, input and blur handlers may run and send requests. The value is synthetic and is not stored. Observed requests during typing and the following wait are included in the request log. Teardown-only transmissions are not measured.
  • Resolved 1 first-party subdomain that is a CNAME alias for a third-party tracker (CNAME cloaking), which request-URL matching alone would miss.
  • Read the site's privacy policy (https://www.costco.com/{seg}/{seg}/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 scan typed a synthetic test value into 1 form field with native form submission blocked. Focus, input and blur handlers may run and send requests. The value is synthetic and is not stored. Observed requests during typing and the following wait are included in the request log. Teardown-only transmissions are not measured.

How to use this report

Read the findings and measurement limits first, then inspect the evidence for each recorded visit. Comparisons include both visits, even where a difference cannot be interpreted.

Keep this PDF with its evidence package: the source JSON, correction context, export receipt and SHA256SUMS. The package preserves source bytes and the correction context at export time. Hashes check file consistency; they do not establish independent measurement accuracy or a signed attestation.

Correction context SHA-256: 1a6acc2ad1147c0255b04d14d2748f411159a9516f818959dd3054be53ed216c

Renderer revision: 7ceac3bec3ed9b900be8a50e248d00dc73bf75fc

No blocking — evidence

2026-10-19T11:15:54.273Z · cut short: the synthetic form-input probe did not complete its test, so input-capture detection is incomplete; derived from status and warnings

Retained observations from this visit. Missing measurements do not establish absence of activity.

Request attribution map

Which actor each third-party request is attributed to, from the initiator the browser reported. Attribution, not causation: an initiator may itself have been told what to fetch, and requests with no reported initiator are not distinguished from ones fetched from several. Asterisks mark subdomain labels hidden for privacy.
Attributed requests
46
Not attributable
5
Third-party requests
51

No unique actor could be assigned to 5 of these requests. That includes requests for which the browser reported no usable initiator, and repeated URLs seen with conflicting initiators. This report does not distinguish those causes, so they are counted together rather than drawn.

51 third-party requests: 46 attributed to a single recorded actor, 5 not attributable.

Select a relationship to see its detail and open the rows behind it.

By the numbers

Recorded counts and evidence availability from this one visit. The findings above interpret them.
Requests29951 third-party
Matched Shields lists41classification reported by this visit; no engine readback recorded
Third-party domains142 distinct catalogued service entities
Cookies262 third-party
Storage keys3736 keys privacy-filtered; values omitted
Fingerprint API calls00 API families
Interaction listenersInputthird-party listener coverage; transmission tested separately
GPC signalConfigured offreadback not recorded
Duration18.7s11:15:54 AM UTC

Request composition & timeline

First-party requests 248
Other third-party requests 28
Catalog-matched third-party requests 23

299 requests were recorded from 72 ms to 13,931 ms. Open the request log for exact timing and request details.

0 ms13,931 ms

Domain evidence

16 recorded domains
DomainRoleRequestsCatalog matchResource types
assets.adobedtm.comservice14Adobe: analytics / advertisingscript
*.*.criteo.comservice4Criteo: advertisingfetch
*.criteo.comservice4Criteo: advertisingscript, document
*.demdex.netservice1Adobe: analytics / advertisingfetch
*.*.dynatrace.comthird-party9No catalog matchping, fetch
static.queue-it.netthird-party4No catalog matchscript
transcend-cdn.comthird-party2No catalog matchscript
*.costco-static.comthird-party2No catalog matchfont
cdn.intake-lr.comthird-party2No catalog matchscript
*.dynatrace.comthird-party2No catalog matchscript
*.intake-lr.comthird-party2No catalog matchxhr
assets.queue-it.netthird-party2No catalog matchscript
*.cdndex.iothird-party2No catalog matchxhr
cloudflare.comthird-party1No catalog matchfetch
www.costco.comfirst-party151No catalog matchdocument, stylesheet, script, fetch, image, xhr
*.costco.comfirst-party97No catalog matchimage, script, fetch

Request log

299 recorded requests

In hosts and URLs, * and … mark details hidden for privacy.

Request references name this visit's retained JSON rows in order (B = baseline, V = variant, S = single). R0001 is the first request row.

RefTimeStatusTypeDomainProvenanceURL
B:R000172ms200documentwww.costco.comNot attributedhttps://www.costco.com/
B:R0002137ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
B:R0003137ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
B:R0004137ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
B:R0005138ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
B:R0006139ms200stylesheetwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0007140ms200stylesheetwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0008140ms200stylesheetwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0009145ms200script*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
B:R0010145ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…
B:R0011276ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
B:R0012277ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
B:R0013278ms200fetchwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…
B:R0014279ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
B:R0015280ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
B:R0016283ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
B:R0017284ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
B:R0018284ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
B:R0019285ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0020285ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0021286ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0022289ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0023289ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0024289ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0025290ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0026290ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0027291ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0028291ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0029291ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0030294ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0031295ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0032295ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0033298ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0034299ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0035299ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0036300ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0037300ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0038300ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0039301ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0040301ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0041301ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0042302ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0043302ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0044302ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0045307ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0046307ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0047308ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0048308ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0049309ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0050309ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0051309ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0052310ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0053310ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0054311ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0055311ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0056311ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0057312ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0058312ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0059313ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0060313ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0061313ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0062314ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0063314ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0064314ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0065319ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0066320ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0067320ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0068320ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0069321ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0070321ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0071321ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0072322ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0073322ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0074322ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0075323ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0076323ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0077323ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0078323ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0079324ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0080324ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0081324ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0082324ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
B:R0083325ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
B:R0084325ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
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Brave-list blocking — evidence

2026-10-19T11:15:09.249Z · cut short: the synthetic form-input probe did not complete its test, so input-capture detection is incomplete; derived from status and warnings

Retained observations from this visit. Missing measurements do not establish absence of activity.

Request attribution map

Which actor each third-party request is attributed to, from the initiator the browser reported. Attribution, not causation: an initiator may itself have been told what to fetch, and requests with no reported initiator are not distinguished from ones fetched from several. Asterisks mark subdomain labels hidden for privacy.
Attributed requests
1
Not attributable
0
Third-party requests
1

1 third-party requests: 1 attributed to a single recorded actor, 0 not attributable.

Select a relationship to see its detail and open the rows behind it.

By the numbers

Recorded counts and evidence availability from this one visit. The findings above interpret them.
Requests1351 third-party
Blocked by Brave lists4engine blocks reported by this visit; no engine readback recorded
Third-party domains10 distinct catalogued service entities
Cookies70 third-party
Storage keys66 keys privacy-filtered; values omitted
Fingerprint API calls1433 high-entropy heuristics matched
GPC signalConfigured offreadback not recorded
Duration45s11:15:09 AM UTC

Request composition & timeline

First-party requests 134
Other third-party requests 1
Catalog-matched third-party requests 0

135 requests were recorded from 64 ms to 6,955 ms. Open the request log for exact timing and request details.

0 ms6,955 ms

Domain evidence

3 recorded domains
DomainRoleRequestsCatalog matchResource types
*.costco-static.comthird-party1No catalog matchfont
www.costco.comfirst-party76No catalog matchdocument, stylesheet, script, fetch, image, xhr
*.costco.comfirst-party58No catalog matchimage, script, fetch

Request log

135 recorded requests

In hosts and URLs, * and … mark details hidden for privacy.

Request references name this visit's retained JSON rows in order (B = baseline, V = variant, S = single). R0001 is the first request row.

RefTimeStatusTypeDomainProvenanceURL
V:R000164ms200documentwww.costco.comNot attributedhttps://www.costco.com/
V:R0002127ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0003128ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0004128ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0005128ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0006130ms200stylesheetwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0007130ms200stylesheetwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0008131ms200stylesheetwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0009134ms200script*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0010134ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…
V:R0011190ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0012191ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0013233ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0014234ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0015235ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0016236ms200fetchwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…
V:R0017238ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0018239ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0019239ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0020241ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0021242ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0022242ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0023242ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0024243ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0025243ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0026243ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0027247ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0028248ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0029248ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0030249ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0031249ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0032250ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0033250ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0034250ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0035251ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0036251ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0037256ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0038256ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0039256ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0040257ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0041257ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0042257ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0043258ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0044258ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0045258ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0046259ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0047259ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0048259ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0049260ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0050260ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0051260ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0052260ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0053261ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0054261ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0055261ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0056261ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0057262ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0058262ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0059262ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0060262ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0061262ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0062263ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0063263ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0064263ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0065271ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0066271ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0067271ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0068272ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0069272ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0070272ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0071273ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0072273ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0073273ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0074274ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0075274ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0076274ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0077274ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0078275ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0079275ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0080275ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0081276ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0082276ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…/static
V:R0083276ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0084277ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0085278ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0086278ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0087279ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0088297ms200font*.costco-static.cominitiated by www.costco.comhttps://*.costco-static.com/…
V:R0089308ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0090310ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0091346ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0092347ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0093351ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0094352ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0095352ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0096353ms200image*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R0097791ms200documentwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…
V:R00981,269ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…
V:R00992,120ms200fetch*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R01002,161ms200scriptwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…
V:R01012,241ms200imagewww.costco.cominitiated by www.costco.comhttps://www.costco.com/…
V:R01022,295ms200fetch*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R01035,245ms200xhrwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…
V:R01045,576ms200fetch*.costco.comNot attributedhttps://*.costco.com/…
V:R01055,577ms200fetch*.costco.comNot attributedhttps://*.costco.com/…/search/api/…/search/…
V:R01065,922ms200fetchwww.costco.cominitiated by www.costco.comhttps://www.costco.com/…
V:R01075,924ms200fetch*.costco.comNot attributedhttps://*.costco.com/…/products/…
V:R01085,925ms200fetch*.costco.comNot attributedhttps://*.costco.com/…/products/…
V:R01095,936ms200fetch*.costco.cominitiated by www.costco.comhttps://*.costco.com/…
V:R01105,946ms200fetch*.costco.comNot attributedhttps://*.costco.com/…/products/…
V:R01115,948ms200fetch*.costco.comNot attributedhttps://*.costco.com/…/products/…
V:R01126,257ms206fetch*.costco.comNot attributedhttps://*.costco.com/…
V:R01136,449ms200image*.costco.comNot attributedhttps://*.costco.com/…
V:R01146,452ms200image*.costco.comNot attributedhttps://*.costco.com/…
V:R01156,453ms200image*.costco.comNot attributedhttps://*.costco.com/…
V:R01166,454ms200image*.costco.comNot attributedhttps://*.costco.com/…
V:R01176,454ms200image*.costco.comNot attributedhttps://*.costco.com/…
V:R01186,455ms200image*.costco.comNot attributedhttps://*.costco.com/…
V:R01196,455ms200image*.costco.comNot attributedhttps://*.costco.com/…
V:R01206,455ms200image*.costco.comNot attributedhttps://*.costco.com/…
V:R01216,456ms200image*.costco.comNot attributedhttps://*.costco.com/…
V:R01226,456ms200image*.costco.comNot attributedhttps://*.costco.com/…
V:R01236,460ms200image*.costco.comNot attributedhttps://*.costco.com/…
V:R01246,624ms200fetch*.costco.comNot attributedhttps://*.costco.com/…
V:R01256,952msn/aimage*.costco.comNot attributedhttps://*.costco.com/…
V:R01266,952msn/aimage*.costco.comNot attributedhttps://*.costco.com/…
V:R01276,953msn/aimage*.costco.comNot attributedhttps://*.costco.com/…
V:R01286,953msn/aimage*.costco.comNot attributedhttps://*.costco.com/…
V:R01296,953msn/aimage*.costco.comNot attributedhttps://*.costco.com/…
V:R01306,953msn/aimage*.costco.comNot attributedhttps://*.costco.com/…
V:R01316,954msn/aimage*.costco.comNot attributedhttps://*.costco.com/…
V:R01326,954msn/aimage*.costco.comNot attributedhttps://*.costco.com/…
V:R01336,954msn/aimage*.costco.comNot attributedhttps://*.costco.com/…
V:R01346,954msn/aimage*.costco.comNot attributedhttps://*.costco.com/…
V:R01356,955msn/aimage*.costco.comNot attributedhttps://*.costco.com/…

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.

Integrity and provenance

Evidence receipt

Open report JSONOpen provenance sidecarPrintable versionDownload PDF + evidenceOpen PDF
Report ID
20261019-38526c4bd61126f77fc547d721c6eb3f
Site
www.costco.com
Latest visit
Schema
v1 schema · facts legacy-derived · descriptive report
Verify recorded provenance

Baseline visit

Started
Run quality
cut short: the synthetic form-input probe did not complete its test, so input-capture detection is incomplete; derived from status and warnings
Scanner
playwright-chromium
Browser
153.0.8010.12
Redaction
not recorded by this schema
Provenance
Exact build and instrument digests were not recorded by this legacy schema.

Variant visit

Started
Run quality
cut short: the synthetic form-input probe did not complete its test, so input-capture detection is incomplete; derived from status and warnings
Scanner
playwright-chromium
Browser
153.0.8010.12
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.

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 .

Reports record one automated visit per condition; visits may be incomplete. On restart-safe deployments, an interrupted visit may be retried; attempts are never merged. Results describe these visits, not everything a site can do.