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   ],
   "witness_provenance": {
    "found_by": [
     "@FarLab"
    ],
    "date": "2026-08-19",
    "found_at_samples": 15000000,
    "survived_samples": 30000000,
    "tool": "verify/ris_gpu --pair-depth 24",
    "seeds": [
     1,
     2
    ]
   }
  }
 },
 "provenance": {
  "authors": [
   "@FarLab"
  ],
  "origin": "submission",
  "novelty": "new_parameters",
  "construction": "Generalized bicycle (two-block) code on Z_105: H_X=[A|B], H_Z=[B^T|A^T], a(x)=x^14+x^70+x^84, b(x)=x^12+x^48+x^57; g=gcd(a,b,x^105-1) irreducible of degree 6, k=2*deg(g)=12, row weight 6. Full circulant check sets kept (redundant rows carry the symmetry).",
  "model": "Claude Fable 5",
  "references": [
   "arXiv:2203.17216",
   "arXiv:2306.16400"
  ],
  "date": "2026-08-19",
  "notes": "Orbit-structured GB search find; the full Tanner automorphism group acts with 4 orbits on the 12 canonical logical classes. Distance evidence: GPU deep-RIS 15M full-kernel pair trials x 2 seeds per side (CPU-verified witnesses) + sqetch 20Mx2 trials/side; nothing below 10 by any engine. Novelty basis: 2026-08-19 lit pass (Wang-Pryadko 2203.17216 = k=2 family; Lin-Pryadko 2306.16400 = n<=100; no zoo/board hits)."
 },
 "family": "generalized-bicycle"
}