{
  "schema": 1,
  "method": "Direct 4-by-4 Hill transform over Z_26; column vectors; A=0 through Z=25.",
  "inputs": {
    "ciphertext": {
      "path": "archive/gaps/seed-01-themessage-body-6448.txt",
      "length": 6448,
      "sha256": "50bd9c4424db47e15cc3a543c379b6ec722c8eaed76fbaeef738b0427d4e8e75",
      "expected_sha256": "50bd9c4424db47e15cc3a543c379b6ec722c8eaed76fbaeef738b0427d4e8e75",
      "provenance_note": "Canonical bare body; see the seed-01 recovery record for the reconstructed PGP verification."
    },
    "digit_recovery": {
      "path": "archive/recon/web-archives/ARTIFACT-nothingisrandom-digit-string-1422.txt",
      "source_sha256": "04ee148915015d5f1e825d34685b4eab61e1a6c136d98db447499243f3cfd9cd",
      "digits_length": 1422,
      "digits_sha256": "450a60bce6f2827972f22662b2abcf4112d9a4e45218aa6bf0b5d48aec48492f",
      "provenance_note": "Primary-derived recovered digit string; original detached/clearsign armor was not recovered."
    }
  },
  "bitmap": {
    "expansion_rule": {
      "0": "1",
      "1-9": "digit count of 0 bits"
    },
    "expanded_bit_count": 3151,
    "shape_rows_by_columns": [
      137,
      23
    ],
    "numeric_field": [
      {
        "rows_1based": [
          131,
          135
        ],
        "columns_1based": [
          3,
          6
        ],
        "vertical_bit_columns": [
          "00001",
          "00011",
          "00111",
          "01111"
        ],
        "values": [
          1,
          3,
          7,
          15
        ],
        "marker_row_1based": 136
      },
      {
        "rows_1based": [
          131,
          135
        ],
        "columns_1based": [
          8,
          11
        ],
        "vertical_bit_columns": [
          "00110",
          "00010",
          "01110",
          "00101"
        ],
        "values": [
          6,
          2,
          14,
          5
        ],
        "marker_row_1based": 136
      },
      {
        "rows_1based": [
          131,
          135
        ],
        "columns_1based": [
          13,
          16
        ],
        "vertical_bit_columns": [
          "01000",
          "01100",
          "10111",
          "10001"
        ],
        "values": [
          8,
          12,
          23,
          17
        ],
        "marker_row_1based": 136
      },
      {
        "rows_1based": [
          131,
          135
        ],
        "columns_1based": [
          18,
          21
        ],
        "vertical_bit_columns": [
          "01001",
          "10000",
          "00100",
          "01011"
        ],
        "values": [
          9,
          16,
          4,
          11
        ],
        "marker_row_1based": 136
      }
    ]
  },
  "key": {
    "matrix": [
      [
        1,
        3,
        7,
        15
      ],
      [
        6,
        2,
        14,
        5
      ],
      [
        8,
        12,
        23,
        17
      ],
      [
        9,
        16,
        4,
        11
      ]
    ],
    "determinant": 12375,
    "determinant_mod_26": 25,
    "determinant_inverse_mod_26": 25,
    "inverse_mod_26": [
      [
        24,
        11,
        14,
        21
      ],
      [
        1,
        9,
        17,
        25
      ],
      [
        12,
        17,
        17,
        4
      ],
      [
        10,
        19,
        12,
        16
      ]
    ],
    "two_sided_inverse_check": true
  },
  "convention": {
    "alphabet": "A=0, B=1, ..., Z=25",
    "block_size": 4,
    "vector_orientation": "column",
    "operation": "plaintext = matrix * ciphertext (mod 26)",
    "blocks_processed": 1612
  },
  "result": {
    "plaintext_path": "solution/themessage-hill-plaintext.txt",
    "length": 6448,
    "sha256": "a2ccb52f5a840115ac5bd0752501f1ed1081e15663b6f33fb992a9954cd08b1f",
    "prefix": "ITSTIMETOGIVEYOUOTHERDETAILSOFOURINTERVENTION",
    "suffix": "THISWASOURGOALYOUMUSTUNDERSTANDONETHINGNOTHINGISRANDOMTOGETTHENEXTINSTRUCTIONSVISITBITLYAABBBCCCC",
    "plaintext_is_uppercase_ascii": true
  },
  "limitations": [
    "This script proves the documented transform and output from the preserved local inputs; it does not itself verify OpenPGP signatures.",
    "The digit string is a primary-derived reconstruction rather than a surviving signed bitmap file.",
    "A coherent plaintext and endpoint instruction do not validate the text's factual or ideological claims."
  ]
}