{
  "ok": true,
  "mode": "JS8",
  "tool": "webftr-js8-real-ldpc-matrix-syndrome-probe",
  "tool_version": "step32-anchored-candidate-fast-export-guard",
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        "parity83_expected": "01010001110011110101001000111000111101000010011111000011011000000110101111000110000",
        "syndrome83": "11010011010001110101101010111000111101000110001111010111011010101010101101001100101",
        "syndrome_weight": 46,
        "valid_codeword_hard_decision": false,
        "message91_sha256_16": "955c77d80df1fcb9",
        "codeword174_sha256_16": "c9eebc015cbfc7d5"
      },
      "repair": {
        "attempted": true,
        "flip_count": 8,
        "repair_success": false,
        "final_syndrome_weight": 28,
        "trace": [
          {
            "flip_index": 6,
            "llr_abs": 0.029594,
            "gain": 11,
            "syndrome_weight_after": 35
          },
          {
            "flip_index": 137,
            "llr_abs": 0.246935,
            "gain": 1,
            "syndrome_weight_after": 34
          },
          {
            "flip_index": 143,
            "llr_abs": 0.288153,
            "gain": 1,
            "syndrome_weight_after": 33
          },
          {
            "flip_index": 153,
            "llr_abs": 0.45403,
            "gain": 1,
            "syndrome_weight_after": 32
          },
          {
            "flip_index": 142,
            "llr_abs": 0.496341,
            "gain": 1,
            "syndrome_weight_after": 31
          },
          {
            "flip_index": 148,
            "llr_abs": 0.629658,
            "gain": 1,
            "syndrome_weight_after": 30
          },
          {
            "flip_index": 134,
            "llr_abs": 1.080448,
            "gain": 1,
            "syndrome_weight_after": 29
          },
          {
            "flip_index": 132,
            "llr_abs": 1.184399,
            "gain": 1,
            "syndrome_weight_after": 28
          }
        ],
        "repaired_message91_sha256_16": "74cab80ed66254c9"
      }
    },
    {
      "variant": "lab_mask_xor_preview",
      "transform": "reverse_codeword",
      "hard_weight_174": 81,
      "llr_avg_abs": 2.3472972758620685,
      "syndrome": {
        "bits_len": 174,
        "message91": "0101001000000000010001010010100001011100100000110110101110001011001000001000110010110001011",
        "parity83_observed": "11111000011101001110111001010111001011111010101000010110011001111001010110110101100",
        "parity83_expected": "01001011100110101001011010001000011011011001000000000011001001110101001001001010010",
        "syndrome83": "10110011111011100111100011011111010000100011101000010101010000001100011111111111110",
        "syndrome_weight": 47,
        "valid_codeword_hard_decision": false,
        "message91_sha256_16": "3767412c437ee071",
        "codeword174_sha256_16": "2dbdc32b125cc762"
      },
      "repair": {
        "attempted": true,
        "flip_count": 8,
        "repair_success": false,
        "final_syndrome_weight": 29,
        "trace": [
          {
            "flip_index": 20,
            "llr_abs": 0.45403,
            "gain": 11,
            "syndrome_weight_after": 36
          },
          {
            "flip_index": 167,
            "llr_abs": 0.029594,
            "gain": 1,
            "syndrome_weight_after": 35
          },
          {
            "flip_index": 96,
            "llr_abs": 0.100571,
            "gain": 1,
            "syndrome_weight_after": 34
          },
          {
            "flip_index": 150,
            "llr_abs": 0.368908,
            "gain": 1,
            "syndrome_weight_after": 33
          },
          {
            "flip_index": 152,
            "llr_abs": 0.383479,
            "gain": 1,
            "syndrome_weight_after": 32
          },
          {
            "flip_index": 127,
            "llr_abs": 0.652631,
            "gain": 1,
            "syndrome_weight_after": 31
          },
          {
            "flip_index": 166,
            "llr_abs": 0.699307,
            "gain": 1,
            "syndrome_weight_after": 30
          },
          {
            "flip_index": 125,
            "llr_abs": 0.96535,
            "gain": 1,
            "syndrome_weight_after": 29
          }
        ],
        "repaired_message91_sha256_16": "d1606d6c8a9256ef"
      }
    }
  ],
  "decodes": [],
  "outputs": {
    "ldpc_matrix_probe_json": "/decoders/js8_decoder/runtime/ldpc_matrix_probe/step19_ldpc_matrix_probe.json"
  },
  "warnings": [
    "Step 32 uses the real public FT8/JS8-style (174,91) generator matrix for a hard-decision syndrome probe.",
    "This is not yet a complete soft LDPC belief-propagation decoder and does not unpack JS8 messages.",
    "If best_matrix_probe reaches syndrome_weight 0, the next step can feed message91 into CRC/message unpack. Otherwise Step 32 should add real soft LDPC iterations."
  ],
  "next_action": "Upload logs. Next step: soft LDPC belief-propagation/min-sum decoder using this matrix contract, then JS8 message unpacking."
}