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Website evidence · pilot dataset

Does irs.gov fingerprint you?

Browser signals observed; fingerprinting is unconfirmed.

Browser API activity met a monitored signal threshold in the latest measured scans. The activity alone does not establish a tracking purpose.

Open evidence JSON ↗

All 8 source records are included in the JSON. Scan timestamps and versions are shown as recorded. The tabs show the latest usable homepage measurement for each setup. Later failed attempts remain in the history. Scan scope and methodology ↗

Inside the scan

← All websites

Visitor setup

Signals observed

1 of 5 signal families observed

Canvas: Not observedWebGL: Not observedAudio: Not observedFonts: Not observedDevice: Observed
Measurement
Measured
Page context
Page document
Scan time
2026-10-22T20:30:18.170508Z
Browser / scanner
156.0.8078.4 / 0.4

Captured titleInternal Revenue Service | An official website of the United States government

CanvasDraws text and reads canvas output.1 API entries

Observed requires a text-drawing API and a canvas readback API. Guide ↗

canvas.getContext1 calls

Frame: https://www.irs.gov/

  • Inline caller recorded
WebGLQueries the graphics environment.0 API entries

Observed requires at least three distinct WebGL probing APIs. Guide ↗

No matching API call was captured.

AudioRenders or reads audio samples.0 API entries

Observed requires offline rendering, buffer reads, or analyser reads. Guide ↗

No matching API call was captured.

FontsMeasures text repeatedly.0 API entries

Observed requires at least ten text-measurement calls. Guide ↗

No matching API call was captured.

DeviceReads browser and display properties.4 API entries

Observed requires at least three distinct browser, screen, or window properties. Guide ↗

navigator.language6 calls

Frame: https://www.irs.gov/

  • https://www.googletagmanager.com/gtag/js
navigator.userAgent66 calls

Frame: https://www.irs.gov/

  • https://www.googletagmanager.com/gtag/js
  • https://www.googletagmanager.com/gtm.js
screen.height6 calls

Frame: https://www.irs.gov/

  • https://www.googletagmanager.com/gtag/js
screen.width6 calls

Frame: https://www.irs.gov/

  • https://www.googletagmanager.com/gtag/js
Providers, script signatures, and DNS 2 provider labels

Provider labels and static signatures are scanner observations. A library-name match does not establish that its code executed.

  • Google Analyticswww.google-analytics.com
  • Google Tag Managerwww.googletagmanager.com
Network and worker observations 48 requests
Captured scripts
7
Instrumented frames
1
Google Ads observed
No
Transmission evidence
Not validated

Legacy transmission hints are excluded. A request after an API call does not establish that the extracted value was sent.

Third-party hosts

  • dap.digitalgov.gov
  • resources.digital-cloud-gov.medallia.com
  • static.addtoany.com
  • www.google-analytics.com
  • www.googletagmanager.com
Other recorded API calls 2
  • document.cookie.read44 calls
  • document.cookie.write11 calls
Source record and integrity
Original source
results/headful/irs-gov-20261022T203018.json
Original file SHA-256
c0ac3bfbcba05d9a75f9335704f4b637ca3d6fe4b80fe0ab1284ade68f172998

Run ID: headful-c0ac3bfbcba0. The JSON contains sanitized observations, not the original private scan payload.

Other scan attempts (4)

Visitor setup

Navigation failed

Navigation failed

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Navigation failed
Page context
Page not measured
Scan time
2026-10-21T22:55:01.564868Z
Browser / scanner
156.0.8078.4 / 0.3
Navigation failed — no usable scan result

Navigation or page loading failed in this browser setup. The record does not establish why it failed.

Source record and integrity
Original source
results/headful/irs-gov-20261021T225501.json
Original file SHA-256
8fbe819a6b449448b7ba8a8aa04ab885ee239ff3f24dbe32349dc4a964c37a09

Run ID: headful-8fbe819a6b44. The JSON contains sanitized observations, not the original private scan payload.

Visitor setup

Scanner error

Scanner error

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Scanner error
Page context
Page not measured
Scan time
2026-10-22T15:01:04.534618Z
Browser / scanner
156.0.8078.4 / 0.4
Scanner error — no usable scan result

The scanner crashed while collecting this page. No usable API results were saved for this setup. A fresh scan is needed; this is not a site-blocking verdict.

Source record and integrity
Original source
results/headful/irs-gov-20261022T150104.json
Original file SHA-256
e6b263a9ac70b1a1dd1593382aa77fb81ab343a4b92fd94a789c5937449ce022

Run ID: headful-e6b263a9ac70. The JSON contains sanitized observations, not the original private scan payload.

Visitor setup

Navigation failed

Navigation failed

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Navigation failed
Page context
Page not measured
Scan time
2026-10-22T15:01:05.031965Z
Browser / scanner
156.0.8078.4 / 0.4
Navigation failed — no usable scan result

Navigation or page loading failed in this browser setup. The record does not establish why it failed.

Source record and integrity
Original source
results/headful/irs-gov-20261022T150105.json
Original file SHA-256
f5d8aa398caed8b0c7b01bafed6a7f8b1d4435e1697865d88121fcf48c9d63b4

Run ID: headful-f5d8aa398cae. The JSON contains sanitized observations, not the original private scan payload.

Visitor setup

Scanner error

Scanner error

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Scanner error
Page context
Page not measured
Scan time
2026-10-22T20:30:17.174965Z
Browser / scanner
156.0.8078.4 / 0.4
Scanner error — no usable scan result

The scanner crashed while collecting this page. No usable API results were saved for this setup. A fresh scan is needed; this is not a site-blocking verdict.

Source record and integrity
Original source
results/headful/irs-gov-20261022T203017.json
Original file SHA-256
4ab8f8927c2d66fbdfdb3adb22ac03ea8bee97047e83cc5528d6011b13319491

Run ID: headful-4ab8f8927c2d. The JSON contains sanitized observations, not the original private scan payload.

Research setup

Signals observed

1 of 5 signal families observed

Canvas: Not observedWebGL: Not observedAudio: Not observedFonts: Not observedDevice: Observed
Measurement
Measured · Partial load
Page context
Page document
Scan time
2026-10-22T22:44:44.232034Z
Browser / scanner
156.0.8078.4 / 0.4

Captured titleInternal Revenue Service | An official website of the United States government

CanvasDraws text and reads canvas output.1 API entries

Observed requires a text-drawing API and a canvas readback API. Guide ↗

canvas.getContext1 calls

Frame: https://www.irs.gov/

  • Inline caller recorded
WebGLQueries the graphics environment.0 API entries

Observed requires at least three distinct WebGL probing APIs. Guide ↗

No matching API call was captured.

AudioRenders or reads audio samples.0 API entries

Observed requires offline rendering, buffer reads, or analyser reads. Guide ↗

No matching API call was captured.

FontsMeasures text repeatedly.0 API entries

Observed requires at least ten text-measurement calls. Guide ↗

No matching API call was captured.

DeviceReads browser and display properties.5 API entries

Observed requires at least three distinct browser, screen, or window properties. Guide ↗

navigator.language10 calls

Frame: https://www.irs.gov/

  • https://www.googletagmanager.com/gtag/js
navigator.platform1 calls

Frame: https://www.irs.gov/

  • https://resources.digital-cloud-gov.medallia.com/wdcgov/20103/onsite/generic1790098802199.jsline 1 · col 135273
navigator.userAgent133 calls

Frame: https://www.irs.gov/

  • https://resources.digital-cloud-gov.medallia.com/wdcgov/20103/onsite/embed.jsline 1 · col 1529
  • https://resources.digital-cloud-gov.medallia.com/wdcgov/20103/onsite/embed.jsline 1 · col 1615
  • https://resources.digital-cloud-gov.medallia.com/wdcgov/20103/onsite/generic1790098802199.jsline 1 · col 131754
  • https://www.googletagmanager.com/gtag/js
  • https://www.googletagmanager.com/gtm.js
screen.height11 calls

Frame: https://www.irs.gov/

  • https://resources.digital-cloud-gov.medallia.com/wdcgov/20103/onsite/generic1790098802199.jsline 1 · col 135225
  • https://www.googletagmanager.com/gtag/js
screen.width11 calls

Frame: https://www.irs.gov/

  • https://resources.digital-cloud-gov.medallia.com/wdcgov/20103/onsite/generic1790098802199.jsline 1 · col 135201
  • https://www.googletagmanager.com/gtag/js
Providers, script signatures, and DNS 2 provider labels

Provider labels and static signatures are scanner observations. A library-name match does not establish that its code executed.

  • Google Analyticswww.google-analytics.com
  • Google Tag Managerwww.googletagmanager.com
Network and worker observations 60 requests
Captured scripts
15
Instrumented frames
1
Google Ads observed
No
Transmission evidence
Not validated

Legacy transmission hints are excluded. A request after an API call does not establish that the extracted value was sent.

Third-party hosts

  • analytics-fe.digital-cloud-gov.medallia.com
  • dap.digitalgov.gov
  • gov1.siteintercept.qualtrics.com
  • resources.digital-cloud-gov.medallia.com
  • static.addtoany.com
  • www.google-analytics.com
  • www.googletagmanager.com
  • znz446m0pt6ct85k5-irsresearch.gov1.siteintercept.qualtrics.com
Other recorded API calls 2
  • document.cookie.read139 calls
  • document.cookie.write20 calls
Source record and integrity
Original source
results/headless/irs-gov-20261022T224444.json
Original file SHA-256
90f16b8e3dddbbc646f9468c82fb65add7d0ca28d53d8edc7f0266d2bb220ee8

Run ID: research-90f16b8e3ddd. The JSON contains sanitized observations, not the original private scan payload.

Other scan attempts (2)

Research setup

Navigation failed

Navigation failed

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Navigation failed
Page context
Page not measured
Scan time
2026-10-21T21:13:13.828130Z
Browser / scanner
156.0.8078.4 / 0.3
Navigation failed — no usable scan result

Navigation or page loading failed in this browser setup. The record does not establish why it failed.

Source record and integrity
Original source
results/headless/irs-gov-20261021T211313.json
Original file SHA-256
783dc8d7c6917b7e1caab315190aa1f89ff80dd13eb360b10f17dae8edb37a6d

Run ID: research-783dc8d7c691. The JSON contains sanitized observations, not the original private scan payload.

Research setup

Navigation failed

Navigation failed

Canvas: UnmeasuredWebGL: UnmeasuredAudio: UnmeasuredFonts: UnmeasuredDevice: Unmeasured
Measurement
Navigation failed
Page context
Page not measured
Scan time
2026-10-22T18:21:40.666852Z
Browser / scanner
156.0.8078.4 / 0.4
Navigation failed — no usable scan result

Navigation or page loading failed in this browser setup. The record does not establish why it failed.

Source record and integrity
Original source
results/headless/irs-gov-20261022T182140.json
Original file SHA-256
6be693543f4983a6d0030b0a094e538f73c0868dda6ea4d5fe456d8c2b9cc682

Run ID: research-6be693543f49. The JSON contains sanitized observations, not the original private scan payload.

Queries, request bodies, cookies, extracted values, raw errors, and session payloads are excluded before publication. The source digest identifies the original private record.

Read the sanitized JSON →