{
  "title": "Chrome/Python/Go browser fingerprint experiment — sanitized evidence summary",
  "measurement_date": "2026-09-27",
  "scope": "Cold HTTP/2 connections through one proxy entry; no TCP SYN/JA4T, no resumption, no H3, no JavaScript fingerprints or target-site detection-rate testing",
  "experiments": [
    {
      "id": "controlled-10",
      "date": "2026-09-27T12:26:40.689506+00:00",
      "chrome_version": "150.0.7871.124",
      "curl_cffi": "0.16.3",
      "tls_client": "v1.16.0",
      "python_profile": "chrome150",
      "go_profile": "Chrome_150",
      "headless": false,
      "groups": {
        "go_static": {
          "attempts": 10,
          "successes": 10,
          "failures": 0,
          "ja4_values": [
            "t13d1516h2_8daaf6152771_806a8c22fdea"
          ],
          "akamai_values": [
            "1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p"
          ],
          "unique_ja3": 1
        },
        "chrome": {
          "attempts": 10,
          "successes": 10,
          "failures": 0,
          "ja4_values": [
            "t13d1516h2_8daaf6152771_806a8c22fdea"
          ],
          "akamai_values": [
            "1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p"
          ],
          "unique_ja3": 10
        },
        "python": {
          "attempts": 10,
          "successes": 10,
          "failures": 0,
          "ja4_values": [
            "t13d1516h2_8daaf6152771_806a8c22fdea"
          ],
          "akamai_values": [
            "1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p"
          ],
          "unique_ja3": 10
        },
        "go_random": {
          "attempts": 10,
          "successes": 10,
          "failures": 0,
          "ja4_values": [
            "t13d1516h2_8daaf6152771_806a8c22fdea"
          ],
          "akamai_values": [
            "1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p"
          ],
          "unique_ja3": 10
        }
      }
    },
    {
      "id": "chrome153-profiles150",
      "date": "2026-09-27T12:48:02.593501+00:00",
      "chrome_version": "153.0.8010.53",
      "curl_cffi": "0.16.3",
      "tls_client": "v1.16.0",
      "python_profile": "chrome150",
      "go_profile": "Chrome_150",
      "headless": false,
      "groups": {
        "go_static": {
          "attempts": 10,
          "successes": 10,
          "failures": 0,
          "ja4_values": [
            "t13d1516h2_8daaf6152771_806a8c22fdea"
          ],
          "akamai_values": [
            "1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p"
          ],
          "unique_ja3": 1
        },
        "chrome": {
          "attempts": 10,
          "successes": 10,
          "failures": 0,
          "ja4_values": [
            "t13d1517h2_8daaf6152771_cb7bf5808d99"
          ],
          "akamai_values": [
            "1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p"
          ],
          "unique_ja3": 10
        },
        "python": {
          "attempts": 10,
          "successes": 10,
          "failures": 0,
          "ja4_values": [
            "t13d1516h2_8daaf6152771_806a8c22fdea"
          ],
          "akamai_values": [
            "1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p"
          ],
          "unique_ja3": 10
        },
        "go_random": {
          "attempts": 10,
          "successes": 10,
          "failures": 0,
          "ja4_values": [
            "t13d1516h2_8daaf6152771_806a8c22fdea"
          ],
          "akamai_values": [
            "1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p"
          ],
          "unique_ja3": 10
        }
      }
    },
    {
      "id": "layered-153-20",
      "date": "2026-09-27T13:03:32.766029+00:00",
      "chrome_version": "153.0.8010.53",
      "curl_cffi": "0.16.3",
      "tls_client": "v1.16.0",
      "python_profile": "chrome150",
      "go_profile": "chrome_152",
      "headless": false,
      "groups": {
        "python": {
          "attempts": 21,
          "successes": 20,
          "failures": 1,
          "ja4_values": [
            "t13d1516h2_8daaf6152771_806a8c22fdea"
          ],
          "akamai_values": [
            "1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p"
          ],
          "unique_ja3": 20,
          "length_histograms": {
            "client_hello_bytes": {
              "1722": 4,
              "1754": 5,
              "1786": 4,
              "1818": 7
            },
            "ech_bytes": {
              "186": 4,
              "218": 5,
              "250": 4,
              "282": 7
            },
            "padding_bytes": {
              "0": 20
            },
            "trust_anchors_bytes": {
              "0": 20
            },
            "ch_minus_ech_bytes": {
              "1536": 20
            }
          },
          "trust_anchor_order_count": 0
        },
        "go_random": {
          "attempts": 21,
          "successes": 20,
          "failures": 1,
          "ja4_values": [
            "t13d1517h2_8daaf6152771_cb7bf5808d99"
          ],
          "akamai_values": [
            "1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p"
          ],
          "unique_ja3": 20,
          "length_histograms": {
            "client_hello_bytes": {
              "1914": 3,
              "1946": 3,
              "1978": 8,
              "2010": 6
            },
            "ech_bytes": {
              "186": 3,
              "218": 3,
              "250": 8,
              "282": 6
            },
            "padding_bytes": {
              "0": 20
            },
            "trust_anchors_bytes": {
              "186": 20
            },
            "ch_minus_ech_bytes": {
              "1728": 20
            }
          },
          "trust_anchor_order_count": 20
        },
        "chrome": {
          "attempts": 20,
          "successes": 20,
          "failures": 0,
          "ja4_values": [
            "t13d1517h2_8daaf6152771_cb7bf5808d99"
          ],
          "akamai_values": [
            "1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p"
          ],
          "unique_ja3": 20,
          "length_histograms": {
            "client_hello_bytes": {
              "1914": 6,
              "1946": 8,
              "1978": 4,
              "2010": 2
            },
            "ech_bytes": {
              "186": 6,
              "218": 8,
              "250": 4,
              "282": 2
            },
            "padding_bytes": {
              "0": 20
            },
            "trust_anchors_bytes": {
              "186": 20
            },
            "ch_minus_ech_bytes": {
              "1728": 20
            }
          },
          "trust_anchor_order_count": 2
        },
        "go_static": {
          "attempts": 20,
          "successes": 20,
          "failures": 0,
          "ja4_values": [
            "t13d1517h2_8daaf6152771_cb7bf5808d99"
          ],
          "akamai_values": [
            "1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p"
          ],
          "unique_ja3": 1,
          "length_histograms": {
            "client_hello_bytes": {
              "1914": 4,
              "1946": 6,
              "1978": 4,
              "2010": 6
            },
            "ech_bytes": {
              "186": 4,
              "218": 6,
              "250": 4,
              "282": 6
            },
            "padding_bytes": {
              "0": 20
            },
            "trust_anchors_bytes": {
              "186": 20
            },
            "ch_minus_ech_bytes": {
              "1728": 20
            }
          },
          "trust_anchor_order_count": 20
        }
      },
      "layer_statuses": {
        "python": {
          "summary": "FAIL",
          "structure": "FAIL",
          "bytes": "WARN",
          "application": "FAIL",
          "application_failure_reason": "Declared profile generation differs from target; own headers/profile consistent"
        },
        "go_random": {
          "summary": "PASS",
          "structure": "PASS",
          "bytes": "WARN",
          "application": "FAIL",
          "application_failure_reason": "Declared profile generation differs from target; own headers/profile consistent"
        },
        "go_static": {
          "summary": "PASS",
          "structure": "FAIL",
          "bytes": "WARN",
          "application": "FAIL",
          "application_failure_reason": "Declared profile generation differs from target; own headers/profile consistent"
        }
      }
    }
  ]
}