{
  "report_id": "declawd.base64-transform/v1",
  "title": "Base64 transform against the published Declawd watermark",
  "observed_at": "2026-08-24T13:43:09Z",
  "publisher": "San Digital Limited",
  "profile_id": "declawd-v1",
  "threshold": 1.8,
  "scope": "Declawd’s own published KGW-inspired watermark only. Not Claude, not SynthID-Text, not any vendor detector.",
  "hypothesis": {
    "source": "https://news.ycombinator.com/item?id=49333167",
    "observed_on": "2026-08-24",
    "classification": "inference",
    "statement": "A public post proposes that generating output in base64 and decoding it afterwards would defeat a distribution-based text watermark. Generation in the encoded domain cannot be instantiated by a fixed-template watermark, so this bundle neither confirms nor refutes that proposition; it measures only what the fixed template can measure."
  },
  "input": {
    "path": "marked-input.txt",
    "sha256": "1999fe5affc19a9436484dc486058ebbbf4fb1bad83a4f1ed73b9ac30564fbca",
    "description": "The prepared marked passage, byte-identical to the site display data marked text and the controlled-removal source text."
  },
  "encoding": {
    "scheme": "RFC 4648 standard base64",
    "padded": true,
    "line_wrapping": false,
    "input_charset": "UTF-8"
  },
  "measurements": {
    "marked": {
      "raw_tokens": 398,
      "effective_contexts": 358,
      "green_contexts": 114,
      "z": 2.990363,
      "verdict": "above threshold"
    },
    "base64_roundtrip_decoded": {
      "raw_tokens": 398,
      "effective_contexts": 358,
      "green_contexts": 114,
      "z": 2.990363,
      "verdict": "above threshold",
      "byte_identical_to_marked": true
    },
    "base64_representation": {
      "raw_tokens": 260,
      "effective_contexts": 255,
      "green_contexts": 53,
      "z": -1.554668,
      "verdict": "below threshold"
    }
  }
}