{
  "schema_version": 1,
  "run_id": "2026-10",
  "slug": "detection-2026-10",
  "title": "Detection run, October 2026",
  "started_at": "2026-10-28",
  "finished_at": "2026-10-29T08:07:30Z",
  "kernel": "Chrome 155",
  "host": "macOS (Apple Silicon) and Windows 11 (x64, Intel UHD 770), headful",
  "proxy": {
    "type": "residential",
    "exit_ip": null,
    "exit_block": "a fresh US consumer residential exit for every check, never reused",
    "geo": "US"
  },
  "subjects": [
    {
      "id": "antibrow",
      "name": "AntiBrow",
      "version": null,
      "config": "freshly created temporary profile per check, persona matching the host (macOS on macOS, Windows on Windows), default settings, nothing tuned, driven by Playwright over CDP"
    },
    {
      "id": "chrome-stock",
      "name": "Google Chrome",
      "version": "156, stable channel, current on 2026-10-28",
      "config": "fresh user-data directory, same host and the same kind of residential exit, driven by Playwright over CDP"
    }
  ],
  "segments": [
    {
      "id": "cdp-timing-before",
      "label": "The reported flag, before the engine update",
      "description": "deviceandbrowserinfo.com/are_you_a_bot, the check a user reported, on the previous engine build and on stock Google Chrome. Each was loaded three times with Playwright attached while the page ran and three times with nothing connected. Exact times were not recorded.",
      "started_at": "2026-10-28",
      "finished_at": "2026-10-28"
    },
    {
      "id": "cold-macos",
      "label": "Seven public checkers, cold visits",
      "description": "The engine build released on 2026-10-28. Every check is a new temporary profile and a new residential exit, one visit, with Playwright attached for the whole load. Three rounds, plus three extra BrowserScan rounds after one of the first three was docked.",
      "started_at": "2026-10-29T03:32:00Z",
      "finished_at": "2026-10-29T03:59:30Z",
      "presented": {
        "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) ... Chrome/155.0.0.0",
        "platform": "MacIntel",
        "languages": "en-US, en",
        "timezone": "follows the exit (America/Chicago, America/New_York, ...)"
      }
    },
    {
      "id": "cold-windows",
      "label": "The same checkers on a Windows host",
      "description": "The same engine build and the same harness on a Windows 11 machine, Windows persona with the default host hardware. Every check is a new temporary profile and a new residential exit, one visit, three rounds. The host clock zone is US Pacific; the browser follows the exit instead.",
      "started_at": "2026-10-29T07:40:37Z",
      "finished_at": "2026-10-29T08:07:30Z",
      "presented": {
        "user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) ... Chrome/155.0.0.0",
        "platform": "Win32",
        "languages": "en-US",
        "timezone": "follows the exit (America/New_York, America/Los_Angeles, ...)"
      }
    }
  ],
  "checks": [
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "antibrow",
      "result": "fail",
      "detail": "\"You are a bot\" with Playwright attached over CDP. Flags true: hasInconsistentTimingResolution.",
      "metrics": {
        "is_bot": true,
        "flags_true": "hasInconsistentTimingResolution",
        "driver_attached": true
      },
      "segment": "cdp-timing-before",
      "round": 1,
      "kernel": "Chrome 155 (previous build)",
      "evidence_url": null,
      "checked_at": "2026-10-28"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "antibrow",
      "result": "fail",
      "detail": "\"You are a bot\" with Playwright attached over CDP. Flags true: hasInconsistentTimingResolution.",
      "metrics": {
        "is_bot": true,
        "flags_true": "hasInconsistentTimingResolution",
        "driver_attached": true
      },
      "segment": "cdp-timing-before",
      "round": 2,
      "kernel": "Chrome 155 (previous build)",
      "evidence_url": null,
      "checked_at": "2026-10-28"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "antibrow",
      "result": "fail",
      "detail": "\"You are a bot\" with Playwright attached over CDP. Flags true: hasInconsistentTimingResolution.",
      "metrics": {
        "is_bot": true,
        "flags_true": "hasInconsistentTimingResolution",
        "driver_attached": true
      },
      "segment": "cdp-timing-before",
      "round": 3,
      "kernel": "Chrome 155 (previous build)",
      "evidence_url": null,
      "checked_at": "2026-10-28"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "antibrow",
      "result": "pass",
      "detail": "\"You are human!\" with nothing connected while the page loaded; result read afterwards.",
      "metrics": {
        "is_bot": false,
        "flags_true": null,
        "driver_attached": false
      },
      "segment": "cdp-timing-before",
      "round": 1,
      "kernel": "Chrome 155 (previous build)",
      "evidence_url": null,
      "checked_at": "2026-10-28"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "antibrow",
      "result": "pass",
      "detail": "\"You are human!\" with nothing connected while the page loaded; result read afterwards.",
      "metrics": {
        "is_bot": false,
        "flags_true": null,
        "driver_attached": false
      },
      "segment": "cdp-timing-before",
      "round": 2,
      "kernel": "Chrome 155 (previous build)",
      "evidence_url": null,
      "checked_at": "2026-10-28"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "antibrow",
      "result": "pass",
      "detail": "\"You are human!\" with nothing connected while the page loaded; result read afterwards.",
      "metrics": {
        "is_bot": false,
        "flags_true": null,
        "driver_attached": false
      },
      "segment": "cdp-timing-before",
      "round": 3,
      "kernel": "Chrome 155 (previous build)",
      "evidence_url": null,
      "checked_at": "2026-10-28"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "chrome-stock",
      "result": "fail",
      "detail": "\"You are a bot\" with Playwright attached over CDP. Flags true: hasInconsistentTimingResolution, isAutomatedWithCDP.",
      "metrics": {
        "is_bot": true,
        "flags_true": "hasInconsistentTimingResolution, isAutomatedWithCDP",
        "driver_attached": true
      },
      "segment": "cdp-timing-before",
      "round": 1,
      "evidence_url": null,
      "checked_at": "2026-10-28"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "chrome-stock",
      "result": "fail",
      "detail": "\"You are a bot\" with Playwright attached over CDP. Flags true: hasInconsistentTimingResolution, isAutomatedWithCDP.",
      "metrics": {
        "is_bot": true,
        "flags_true": "hasInconsistentTimingResolution, isAutomatedWithCDP",
        "driver_attached": true
      },
      "segment": "cdp-timing-before",
      "round": 2,
      "evidence_url": null,
      "checked_at": "2026-10-28"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "chrome-stock",
      "result": "fail",
      "detail": "\"You are a bot\" with Playwright attached over CDP. Flags true: hasInconsistentTimingResolution, isAutomatedWithCDP.",
      "metrics": {
        "is_bot": true,
        "flags_true": "hasInconsistentTimingResolution, isAutomatedWithCDP",
        "driver_attached": true
      },
      "segment": "cdp-timing-before",
      "round": 3,
      "evidence_url": null,
      "checked_at": "2026-10-28"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "chrome-stock",
      "result": "pass",
      "detail": "\"You are human!\" with nothing connected while the page loaded; result read afterwards.",
      "metrics": {
        "is_bot": false,
        "flags_true": null,
        "driver_attached": false
      },
      "segment": "cdp-timing-before",
      "round": 1,
      "evidence_url": null,
      "checked_at": "2026-10-28"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "chrome-stock",
      "result": "pass",
      "detail": "\"You are human!\" with nothing connected while the page loaded; result read afterwards.",
      "metrics": {
        "is_bot": false,
        "flags_true": null,
        "driver_attached": false
      },
      "segment": "cdp-timing-before",
      "round": 2,
      "evidence_url": null,
      "checked_at": "2026-10-28"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "chrome-stock",
      "result": "pass",
      "detail": "\"You are human!\" with nothing connected while the page loaded; result read afterwards.",
      "metrics": {
        "is_bot": false,
        "flags_true": null,
        "driver_attached": false
      },
      "segment": "cdp-timing-before",
      "round": 3,
      "evidence_url": null,
      "checked_at": "2026-10-28"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "antibrow",
      "result": "pass",
      "detail": "\"You are human!\" isBot false, no individual flag true.",
      "metrics": {
        "is_bot": false,
        "flags_true": null
      },
      "segment": "cold-macos",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "108.174.97.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:32:00Z"
    },
    {
      "detector": "fingerprint-smart-signals",
      "target": "demo.fingerprint.com/playground",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Bot not detected; developer_tools, tampering, anti_detect_browser and virtual_machine all false (tampering ML score 0.7278). Proxy flag true: an address-reputation signal on the residential exit, not a browser one.",
      "metrics": {
        "bot": "not_detected",
        "developer_tools": false,
        "tampering": false,
        "tampering_ml_score": 0.7278,
        "anti_detect_browser": false,
        "virtual_machine": false,
        "virtual_machine_ml_score": 0.073,
        "incognito": false,
        "vpn": false,
        "vpn_confidence": "medium",
        "timezone_mismatch": false,
        "os_mismatch": false,
        "ml_prediction": false,
        "proxy": true
      },
      "segment": "cold-macos",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "73.44.237.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:33:11Z"
    },
    {
      "detector": "browserscan",
      "target": "browserscan.net",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Fingerprint authenticity 100%. Proxy: No. Bot detection: No.",
      "metrics": {
        "authenticity_percent": 100,
        "proxy_detected": false,
        "bot_detected": false,
        "docked_for": null
      },
      "segment": "cold-macos",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "174.66.255.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:34:35Z"
    },
    {
      "detector": "pixelscan",
      "target": "pixelscan.net/fingerprint-check",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Fingerprint consistent, no proxy detected, no masking detected, no automated behavior detected.",
      "metrics": {
        "consistent": true,
        "proxy_detected": false,
        "masking_detected": false,
        "automation_detected": false
      },
      "segment": "cold-macos",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "76.35.242.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:35:15Z"
    },
    {
      "detector": "recaptcha-v3",
      "target": "antcpt.com/score_detector",
      "subject": "antibrow",
      "result": "pass",
      "detail": "reCAPTCHA v3 score 0.9 (1.0 = very likely human).",
      "metrics": {
        "score": 0.9
      },
      "segment": "cold-macos",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "76.33.172.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:35:58Z"
    },
    {
      "detector": "browserleaks-quic",
      "target": "browserleaks.com/quic",
      "subject": "antibrow",
      "result": "inconclusive",
      "detail": "QUIC connection: False, JA4 n/a. QUIC runs over UDP, which an HTTP proxy does not carry, so the browser fell back to TCP. Stock Chrome through the same kind of proxy reads the same.",
      "metrics": {
        "quic_connection": false
      },
      "segment": "cold-macos",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "2600:8807:5600::x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:36:50Z"
    },
    {
      "detector": "twilio-network-test",
      "target": "networktest.twilio.com",
      "subject": "antibrow",
      "result": "inconclusive",
      "detail": "The test page stopped at \"Authentication failed. Please try again later.\" before any connectivity test ran. Stock Chrome on the mac host got the same error.",
      "metrics": {
        "error": "Authentication failed"
      },
      "segment": "cold-macos",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "76.32.250.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:37:32Z"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "antibrow",
      "result": "pass",
      "detail": "\"You are human!\" isBot false, no individual flag true.",
      "metrics": {
        "is_bot": false,
        "flags_true": null
      },
      "segment": "cold-macos",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "2601:189:4100::x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:40:21Z"
    },
    {
      "detector": "fingerprint-smart-signals",
      "target": "demo.fingerprint.com/playground",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Bot not detected; developer_tools, tampering, anti_detect_browser and virtual_machine all false (tampering ML score 0.1126). Proxy flag false.",
      "metrics": {
        "bot": "not_detected",
        "developer_tools": false,
        "tampering": false,
        "tampering_ml_score": 0.1126,
        "anti_detect_browser": false,
        "virtual_machine": false,
        "virtual_machine_ml_score": 0.046,
        "incognito": false,
        "vpn": false,
        "vpn_confidence": "medium",
        "timezone_mismatch": false,
        "os_mismatch": false,
        "ml_prediction": false,
        "proxy": false
      },
      "segment": "cold-macos",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "108.210.135.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:40:54Z"
    },
    {
      "detector": "browserscan",
      "target": "browserscan.net",
      "subject": "antibrow",
      "result": "fail",
      "detail": "Fingerprint authenticity 95%. Proxy: No. Bot detection: No. Anti-detect browser -5%: \"You appear to be using a fingerprint browser\" (canvas fingerprint detection).",
      "metrics": {
        "authenticity_percent": 95,
        "proxy_detected": false,
        "bot_detected": false,
        "docked_for": "anti-detect browser (canvas)"
      },
      "segment": "cold-macos",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "71.112.158.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:42:20Z"
    },
    {
      "detector": "pixelscan",
      "target": "pixelscan.net/fingerprint-check",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Fingerprint consistent, no proxy detected, no masking detected, no automated behavior detected.",
      "metrics": {
        "consistent": true,
        "proxy_detected": false,
        "masking_detected": false,
        "automation_detected": false
      },
      "segment": "cold-macos",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "73.169.23.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:42:55Z"
    },
    {
      "detector": "recaptcha-v3",
      "target": "antcpt.com/score_detector",
      "subject": "antibrow",
      "result": "pass",
      "detail": "reCAPTCHA v3 score 0.9 (1.0 = very likely human).",
      "metrics": {
        "score": 0.9
      },
      "segment": "cold-macos",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "99.122.210.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:43:42Z"
    },
    {
      "detector": "browserleaks-quic",
      "target": "browserleaks.com/quic",
      "subject": "antibrow",
      "result": "inconclusive",
      "detail": "QUIC connection: False, JA4 n/a. QUIC runs over UDP, which an HTTP proxy does not carry, so the browser fell back to TCP. Stock Chrome through the same kind of proxy reads the same.",
      "metrics": {
        "quic_connection": false
      },
      "segment": "cold-macos",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "2600:8806:a605::x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:44:24Z"
    },
    {
      "detector": "twilio-network-test",
      "target": "networktest.twilio.com",
      "subject": "antibrow",
      "result": "inconclusive",
      "detail": "The test page stopped at \"Authentication failed. Please try again later.\" before any connectivity test ran. Stock Chrome on the mac host got the same error.",
      "metrics": {
        "error": "Authentication failed"
      },
      "segment": "cold-macos",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "174.176.166.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:44:58Z"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "antibrow",
      "result": "pass",
      "detail": "\"You are human!\" isBot false, no individual flag true.",
      "metrics": {
        "is_bot": false,
        "flags_true": null
      },
      "segment": "cold-macos",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "47.196.44.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:47:54Z"
    },
    {
      "detector": "fingerprint-smart-signals",
      "target": "demo.fingerprint.com/playground",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Bot not detected; developer_tools, tampering, anti_detect_browser and virtual_machine all false (tampering ML score 0.4367). Proxy flag true: an address-reputation signal on the residential exit, not a browser one.",
      "metrics": {
        "bot": "not_detected",
        "developer_tools": false,
        "tampering": false,
        "tampering_ml_score": 0.4367,
        "anti_detect_browser": false,
        "virtual_machine": false,
        "virtual_machine_ml_score": 0.118,
        "incognito": false,
        "vpn": false,
        "vpn_confidence": "medium",
        "timezone_mismatch": false,
        "os_mismatch": false,
        "ml_prediction": false,
        "proxy": true
      },
      "segment": "cold-macos",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "98.203.38.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:48:26Z"
    },
    {
      "detector": "fingerprint-identification",
      "target": "fingerprint.com/demo",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Visitor ID QZHB8Qbp05mWpgkUrOJ6 at confidence 1, browser read as Chrome 155.0.0 on Mac OS X (10.15.7). Each fresh profile got a different ID.",
      "metrics": {
        "visitor_id": "QZHB8Qbp05mWpgkUrOJ6",
        "confidence": 1,
        "browser_reported": "Chrome 155.0.0 on Mac OS X (10.15.7)"
      },
      "segment": "cold-macos",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "68.37.111.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:49:21Z"
    },
    {
      "detector": "browserscan",
      "target": "browserscan.net",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Fingerprint authenticity 100%. Proxy: No. Bot detection: No.",
      "metrics": {
        "authenticity_percent": 100,
        "proxy_detected": false,
        "bot_detected": false,
        "docked_for": null
      },
      "segment": "cold-macos",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "75.66.177.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:49:47Z"
    },
    {
      "detector": "pixelscan",
      "target": "pixelscan.net/fingerprint-check",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Fingerprint consistent, no proxy detected, no masking detected, no automated behavior detected.",
      "metrics": {
        "consistent": true,
        "proxy_detected": false,
        "masking_detected": false,
        "automation_detected": false
      },
      "segment": "cold-macos",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "24.128.215.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:50:41Z"
    },
    {
      "detector": "recaptcha-v3",
      "target": "antcpt.com/score_detector",
      "subject": "antibrow",
      "result": "pass",
      "detail": "reCAPTCHA v3 score 0.9 (1.0 = very likely human).",
      "metrics": {
        "score": 0.9
      },
      "segment": "cold-macos",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "100.33.139.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:51:26Z"
    },
    {
      "detector": "browserleaks-quic",
      "target": "browserleaks.com/quic",
      "subject": "antibrow",
      "result": "inconclusive",
      "detail": "QUIC connection: False, JA4 n/a. QUIC runs over UDP, which an HTTP proxy does not carry, so the browser fell back to TCP. Stock Chrome through the same kind of proxy reads the same.",
      "metrics": {
        "quic_connection": false
      },
      "segment": "cold-macos",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "65.34.217.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:52:11Z"
    },
    {
      "detector": "twilio-network-test",
      "target": "networktest.twilio.com",
      "subject": "antibrow",
      "result": "inconclusive",
      "detail": "The test page stopped at \"Authentication failed. Please try again later.\" before any connectivity test ran. Stock Chrome on the mac host got the same error.",
      "metrics": {
        "error": "Authentication failed"
      },
      "segment": "cold-macos",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "216.246.223.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:52:48Z"
    },
    {
      "detector": "fingerprint-identification",
      "target": "fingerprint.com/demo",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Visitor ID sMPollBmXdyVbfSGmbj0 at confidence 1, browser read as Chrome 155.0.0 on Mac OS X (10.15.7). Each fresh profile got a different ID.",
      "metrics": {
        "visitor_id": "sMPollBmXdyVbfSGmbj0",
        "confidence": 1,
        "browser_reported": "Chrome 155.0.0 on Mac OS X (10.15.7)"
      },
      "segment": "cold-macos",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "46.110.148.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:55:00Z"
    },
    {
      "detector": "browserscan",
      "target": "browserscan.net",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Fingerprint authenticity 100%. Proxy: No. Bot detection: No.",
      "metrics": {
        "authenticity_percent": 100,
        "proxy_detected": false,
        "bot_detected": false,
        "docked_for": null
      },
      "segment": "cold-macos",
      "round": 4,
      "proxy": {
        "type": "residential",
        "exit_ip": "32.217.71.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:56:45Z"
    },
    {
      "detector": "browserscan",
      "target": "browserscan.net",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Fingerprint authenticity 100%. Proxy: No. Bot detection: No.",
      "metrics": {
        "authenticity_percent": 100,
        "proxy_detected": false,
        "bot_detected": false,
        "docked_for": null
      },
      "segment": "cold-macos",
      "round": 5,
      "proxy": {
        "type": "residential",
        "exit_ip": "70.8.245.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:57:24Z"
    },
    {
      "detector": "browserscan",
      "target": "browserscan.net",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Fingerprint authenticity 100%. Proxy: No. Bot detection: No.",
      "metrics": {
        "authenticity_percent": 100,
        "proxy_detected": false,
        "bot_detected": false,
        "docked_for": null
      },
      "segment": "cold-macos",
      "round": 6,
      "proxy": {
        "type": "residential",
        "exit_ip": "208.102.79.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:57:59Z"
    },
    {
      "detector": "fingerprint-identification",
      "target": "fingerprint.com/demo",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Visitor ID ZUVGCv9j0OA50JGbepdM at confidence 1, browser read as Chrome 155.0.0 on Mac OS X (10.15.7). Each fresh profile got a different ID.",
      "metrics": {
        "visitor_id": "ZUVGCv9j0OA50JGbepdM",
        "confidence": 1,
        "browser_reported": "Chrome 155.0.0 on Mac OS X (10.15.7)"
      },
      "segment": "cold-macos",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "2600:100c:a223::x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T03:58:46Z"
    },
    {
      "detector": "fingerprint-identification",
      "target": "fingerprint.com/demo",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Visitor ID oFF2ZjDOIqHAky0oCPBb at confidence 1, browser read as Chrome 155.0.0 on Windows (11). Each fresh profile got a different ID.",
      "metrics": {
        "visitor_id": "oFF2ZjDOIqHAky0oCPBb",
        "confidence": 1,
        "browser_reported": "Chrome 155.0.0 on Windows (11)"
      },
      "segment": "cold-windows",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "99.108.73.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:40:37.874Z"
    },
    {
      "detector": "browserscan",
      "target": "browserscan.net",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Fingerprint authenticity 100%. Proxy: No. Bot detection: No.",
      "metrics": {
        "authenticity_percent": 100,
        "proxy_detected": false,
        "bot_detected": false,
        "docked_for": null
      },
      "segment": "cold-windows",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "76.178.85.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:45:11.387Z"
    },
    {
      "detector": "pixelscan",
      "target": "pixelscan.net/fingerprint-check",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Fingerprint consistent, no proxy detected, no masking detected, no automated behavior detected.",
      "metrics": {
        "consistent": true,
        "proxy_detected": false,
        "masking_detected": false,
        "automation_detected": false
      },
      "segment": "cold-windows",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "66.176.220.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:45:42.233Z"
    },
    {
      "detector": "recaptcha-v3",
      "target": "antcpt.com/score_detector",
      "subject": "antibrow",
      "result": "pass",
      "detail": "reCAPTCHA v3 score 0.9 (1.0 = very likely human).",
      "metrics": {
        "score": 0.9
      },
      "segment": "cold-windows",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "69.87.227.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:46:19.749Z"
    },
    {
      "detector": "browserleaks-quic",
      "target": "browserleaks.com/quic",
      "subject": "antibrow",
      "result": "inconclusive",
      "detail": "The result fields were still empty when the page was read, so this visit recorded nothing.",
      "metrics": {
        "quic_connection": null
      },
      "segment": "cold-windows",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "75.134.4.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:47:05.807Z"
    },
    {
      "detector": "twilio-network-test",
      "target": "networktest.twilio.com",
      "subject": "antibrow",
      "result": "inconclusive",
      "detail": "The test page stopped at \"Authentication failed. Please try again later.\" before any connectivity test ran. Stock Chrome on the mac host got the same error.",
      "metrics": {
        "error": "Authentication failed"
      },
      "segment": "cold-windows",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "134.228.30.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:47:43.603Z"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "antibrow",
      "result": "pass",
      "detail": "\"You are human!\" isBot false, no individual flag true.",
      "metrics": {
        "is_bot": false,
        "flags_true": null
      },
      "segment": "cold-windows",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "2601:247:c802::x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:51:06.858Z"
    },
    {
      "detector": "fingerprint-smart-signals",
      "target": "demo.fingerprint.com/playground",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Bot not detected; developer_tools, tampering, anti_detect_browser and virtual_machine all false (tampering ML score 0.3509). Proxy flag true: an address-reputation signal on the residential exit, not a browser one. VPN flag true at low confidence (methods: ml_prediction) although the browser reported the same time zone as the exit.",
      "metrics": {
        "bot": "not_detected",
        "developer_tools": false,
        "tampering": false,
        "tampering_ml_score": 0.3509,
        "anti_detect_browser": false,
        "virtual_machine": false,
        "virtual_machine_ml_score": 0.211,
        "incognito": false,
        "vpn": true,
        "vpn_confidence": "low",
        "timezone_mismatch": false,
        "os_mismatch": false,
        "ml_prediction": true,
        "proxy": true
      },
      "segment": "cold-windows",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "198.52.237.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:51:41.927Z"
    },
    {
      "detector": "fingerprint-identification",
      "target": "fingerprint.com/demo",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Visitor ID x0AwerwUKXJrgwdEk6pL at confidence 1, browser read as Chrome 155.0.0 on Windows (11). Each fresh profile got a different ID.",
      "metrics": {
        "visitor_id": "x0AwerwUKXJrgwdEk6pL",
        "confidence": 1,
        "browser_reported": "Chrome 155.0.0 on Windows (11)"
      },
      "segment": "cold-windows",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "2605:59ca:4a10::x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:52:05.357Z"
    },
    {
      "detector": "browserscan",
      "target": "browserscan.net",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Fingerprint authenticity 100%. Proxy: No. Bot detection: No.",
      "metrics": {
        "authenticity_percent": 100,
        "proxy_detected": false,
        "bot_detected": false,
        "docked_for": null
      },
      "segment": "cold-windows",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "2601:40d:688::x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:52:28.341Z"
    },
    {
      "detector": "pixelscan",
      "target": "pixelscan.net/fingerprint-check",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Fingerprint consistent, no proxy detected, no masking detected, no automated behavior detected.",
      "metrics": {
        "consistent": true,
        "proxy_detected": false,
        "masking_detected": false,
        "automation_detected": false
      },
      "segment": "cold-windows",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "2603:9001:5e00::x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:55:01.923Z"
    },
    {
      "detector": "recaptcha-v3",
      "target": "antcpt.com/score_detector",
      "subject": "antibrow",
      "result": "pass",
      "detail": "reCAPTCHA v3 score 0.9 (1.0 = very likely human).",
      "metrics": {
        "score": 0.9
      },
      "segment": "cold-windows",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "76.198.26.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:55:34.319Z"
    },
    {
      "detector": "browserleaks-quic",
      "target": "browserleaks.com/quic",
      "subject": "antibrow",
      "result": "inconclusive",
      "detail": "QUIC connection: False, JA4 n/a. QUIC runs over UDP, which an HTTP proxy does not carry, so the browser fell back to TCP. Stock Chrome through the same kind of proxy reads the same.",
      "metrics": {
        "quic_connection": false
      },
      "segment": "cold-windows",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "67.84.47.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:56:14.125Z"
    },
    {
      "detector": "twilio-network-test",
      "target": "networktest.twilio.com",
      "subject": "antibrow",
      "result": "inconclusive",
      "detail": "The test page stopped at \"Authentication failed. Please try again later.\" before any connectivity test ran. Stock Chrome on the mac host got the same error.",
      "metrics": {
        "error": "Authentication failed"
      },
      "segment": "cold-windows",
      "round": 1,
      "proxy": {
        "type": "residential",
        "exit_ip": "104.241.54.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:56:45.048Z"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "antibrow",
      "result": "pass",
      "detail": "\"You are human!\" isBot false, no individual flag true.",
      "metrics": {
        "is_bot": false,
        "flags_true": null
      },
      "segment": "cold-windows",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "167.248.155.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:59:22.868Z"
    },
    {
      "detector": "fingerprint-smart-signals",
      "target": "demo.fingerprint.com/playground",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Bot not detected; developer_tools, tampering, anti_detect_browser and virtual_machine all false (tampering ML score 0.0899). Proxy flag true: an address-reputation signal on the residential exit, not a browser one. VPN flag true at low confidence (methods: timezone_mismatch) although the browser reported the same time zone as the exit.",
      "metrics": {
        "bot": "not_detected",
        "developer_tools": false,
        "tampering": false,
        "tampering_ml_score": 0.0899,
        "anti_detect_browser": false,
        "virtual_machine": false,
        "virtual_machine_ml_score": 0.216,
        "incognito": false,
        "vpn": true,
        "vpn_confidence": "low",
        "timezone_mismatch": true,
        "os_mismatch": false,
        "ml_prediction": false,
        "proxy": true
      },
      "segment": "cold-windows",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "47.151.73.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T07:59:56.902Z"
    },
    {
      "detector": "fingerprint-identification",
      "target": "fingerprint.com/demo",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Visitor ID YHuTUbQr0sJ8PCTATZ38 at confidence 1, browser read as Chrome 155.0.0 on Windows (11). Each fresh profile got a different ID.",
      "metrics": {
        "visitor_id": "YHuTUbQr0sJ8PCTATZ38",
        "confidence": 1,
        "browser_reported": "Chrome 155.0.0 on Windows (11)"
      },
      "segment": "cold-windows",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "2600:382:af78::x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T08:00:25.530Z"
    },
    {
      "detector": "browserscan",
      "target": "browserscan.net",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Fingerprint authenticity 100%. Proxy: No. Bot detection: No.",
      "metrics": {
        "authenticity_percent": 100,
        "proxy_detected": false,
        "bot_detected": false,
        "docked_for": null
      },
      "segment": "cold-windows",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "74.66.90.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T08:00:55.241Z"
    },
    {
      "detector": "pixelscan",
      "target": "pixelscan.net/fingerprint-check",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Fingerprint consistent, no proxy detected, no masking detected, no automated behavior detected.",
      "metrics": {
        "consistent": true,
        "proxy_detected": false,
        "masking_detected": false,
        "automation_detected": false
      },
      "segment": "cold-windows",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "208.102.189.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T08:01:32.476Z"
    },
    {
      "detector": "recaptcha-v3",
      "target": "antcpt.com/score_detector",
      "subject": "antibrow",
      "result": "pass",
      "detail": "reCAPTCHA v3 score 0.9 (1.0 = very likely human).",
      "metrics": {
        "score": 0.9
      },
      "segment": "cold-windows",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "173.79.152.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T08:02:18.385Z"
    },
    {
      "detector": "browserleaks-quic",
      "target": "browserleaks.com/quic",
      "subject": "antibrow",
      "result": "inconclusive",
      "detail": "QUIC connection: False, JA4 n/a. QUIC runs over UDP, which an HTTP proxy does not carry, so the browser fell back to TCP. Stock Chrome through the same kind of proxy reads the same.",
      "metrics": {
        "quic_connection": false
      },
      "segment": "cold-windows",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "73.222.5.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T08:02:56.651Z"
    },
    {
      "detector": "twilio-network-test",
      "target": "networktest.twilio.com",
      "subject": "antibrow",
      "result": "inconclusive",
      "detail": "The test page stopped at \"Authentication failed. Please try again later.\" before any connectivity test ran. Stock Chrome on the mac host got the same error.",
      "metrics": {
        "error": "Authentication failed"
      },
      "segment": "cold-windows",
      "round": 2,
      "proxy": {
        "type": "residential",
        "exit_ip": "2600:1700:13b1::x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T08:03:29.942Z"
    },
    {
      "detector": "deviceandbrowserinfo",
      "target": "deviceandbrowserinfo.com/are_you_a_bot",
      "subject": "antibrow",
      "result": "pass",
      "detail": "\"You are human!\" isBot false, no individual flag true.",
      "metrics": {
        "is_bot": false,
        "flags_true": null
      },
      "segment": "cold-windows",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "69.40.30.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T08:06:08.826Z"
    },
    {
      "detector": "fingerprint-smart-signals",
      "target": "demo.fingerprint.com/playground",
      "subject": "antibrow",
      "result": "pass",
      "detail": "Bot not detected; developer_tools, tampering, anti_detect_browser and virtual_machine all false (tampering ML score 0.7042). Proxy flag true: an address-reputation signal on the residential exit, not a browser one. VPN flag true at high confidence (methods: timezone_mismatch, os_mismatch) although the browser reported the same time zone as the exit.",
      "metrics": {
        "bot": "not_detected",
        "developer_tools": false,
        "tampering": false,
        "tampering_ml_score": 0.7042,
        "anti_detect_browser": false,
        "virtual_machine": false,
        "virtual_machine_ml_score": 0.232,
        "incognito": false,
        "vpn": true,
        "vpn_confidence": "high",
        "timezone_mismatch": true,
        "os_mismatch": true,
        "ml_prediction": false,
        "proxy": true
      },
      "segment": "cold-windows",
      "round": 3,
      "proxy": {
        "type": "residential",
        "exit_ip": "74.109.26.x",
        "geo": "US"
      },
      "evidence_url": null,
      "checked_at": "2026-10-29T08:06:44.134Z"
    }
  ],
  "notes": [
    "This run uses a macOS persona on a macOS host and a Windows persona on a Windows host. August and September presented Windows on a macOS host. The host is recorded because some tells belong to the machine underneath rather than to the browser, and matching the two is the configuration we recommend.",
    "The deviceandbrowserinfo flag was reported by a user, and it reproduced on stock Google Chrome too: with Playwright attached both were scored as bots, with nothing attached both passed. The signal measures what an attached debugger does to the cost of throwing an error deep in the call stack, not anything in the fingerprint. The engine build released on 2026-10-28 removes that difference; stock Chrome still shows it.",
    "One BrowserScan visit in six was docked 5% for \"anti-detect browser\" on its canvas check. The other five scored 100% with the same settings. It stays in the table as a fail, and we are not explaining it away.",
    "Fingerprint Smart Signals reported proxy: true on two of three exits on the mac and three of three on Windows. That signal is about the address, not the browser: the same visits read developer_tools, tampering, anti_detect_browser and virtual_machine as false.",
    "On the Windows host Fingerprint Smart Signals also reported vpn: true on all three visits (once by its ML model, once for a time zone mismatch, once for a time zone and OS mismatch), and on none of the three mac visits. In each case the browser reported the same time zone as the exit, and a separate probe on that host showed the page, an iframe and a worker agreeing on zone, offset and zone name. We have not found what the mismatch is measured against, so it stays unexplained here rather than counted as a pass or a fail.",
    "browserleaks QUIC and the Twilio network test are recorded as inconclusive rather than pass. The first measures whether UDP reaches the site, which no HTTP or SOCKS proxy carries. The second stopped at an authentication error on the Twilio side, the same error stock Chrome got.",
    "Exit addresses are truncated in this dataset. Every check used a different one. On Windows the first attempt of most checks timed out while the engine was still downloading; those attempts produced no result and were rerun with a new exit, and only the reruns are listed."
  ],
  "license": "CC-BY-4.0",
  "canonical": "https://antibrow.com/reports/detection-2026-10"
}