{
  "chain_slug": "soneium",
  "name": "Soneium",
  "scorecard_profile": "rollup-L2",
  "evaluated_at": "2026-04-18",
  "evaluator": "layerqu-v2-scoring-agent-4",
  "v1_reference": "chainscreen-v1-archive",
  "dimensions": {
    "1_cryptographic_exposure": {
      "weight": 0.12,
      "score": 28,
      "sub_scores": {
        "1a_primitive_inventory": {
          "score": 10,
          "primitives_named": [
            "ECDSA secp256k1",
            "Keccak-256",
            "BN254"
          ],
          "evidence": [
            "OP Stack docs"
          ],
          "note": "OP Stack primitives inherited."
        },
        "1b_shor_grover_pq_tag": {
          "score": 12,
          "tags": {
            "ECDSA secp256k1": "Shor-break",
            "BN254": "Shor-break",
            "Keccak-256": "Grover-weaken"
          }
        },
        "1c_algorithm_family_diversity": {
          "score": 0,
          "families_represented": 0,
          "families": []
        },
        "1d_nist_security_category": {
          "score": 0,
          "mappings": {}
        },
        "1e_implementation_quality": {
          "score": 6,
          "formal_verification": "inherits OP Stack audits",
          "constant_time": "standard",
          "libraries": [
            "op-geth",
            "op-node"
          ],
          "evidence": [
            "https://github.com/ethereum-optimism/optimism"
          ]
        }
      },
      "total_artifacts": 1
    },
    "2_hndl_exposure": {
      "weight": 0.08,
      "score": 22,
      "sub_scores": {
        "2a_active_key": {
          "score": 4,
          "note": "EVM EOA exposure."
        },
        "2b_cold_key": {
          "score": 4,
          "note": "Same."
        },
        "2c_sig_long_term": {
          "score": 7,
          "note": "Tx-once."
        },
        "2d_encryption_conf": {
          "score": 7,
          "note": "Standard."
        }
      },
      "total_artifacts": 1
    },
    "3_metadata_privacy_exposure": {
      "weight": 0.08,
      "score": 18,
      "sub_scores": {
        "3a_graph_visibility": {
          "score": 4,
          "note": "Transparent."
        },
        "3b_rpc_concentration": {
          "score": 4,
          "note": "Sony-operated infra heavy."
        },
        "3c_bridge_correlation": {
          "score": 5,
          "note": "OP Stack native bridge."
        },
        "3d_retroactive_deanon": {
          "score": 5,
          "note": "Baseline."
        }
      },
      "total_artifacts": 1
    },
    "4_migration_architecture": {
      "weight": 0.15,
      "score": 20,
      "sub_scores": {
        "4a_crypto_agility": {
          "score": 5,
          "note": "Sony-controlled; OP Stack fork."
        },
        "4b_aa_key_rotation": {
          "score": 10,
          "note": "Inherits ERC-4337."
        },
        "4c_hard_fork_track_record": {
          "score": 3,
          "note": "Launched Jan 2025; minimal track record."
        },
        "4d_hybrid_deployment_readiness": {
          "score": 2,
          "note": "Not architected."
        }
      },
      "total_artifacts": 1
    },
    "5_deployment_execution": {
      "weight": 0.22,
      "score": 0,
      "sub_scores": {
        "5a_mainnet_pqc_pct": {
          "score": 0,
          "mainnet_pqc_pct": 0,
          "evidence": []
        },
        "5b_pqc_code_in_consensus": {
          "score": 0,
          "loc_or_bytes": 0
        },
        "5c_validator_pqc_keys": {
          "score": 0,
          "pct": 0
        },
        "5d_published_milestones": {
          "score": 0,
          "count": 0,
          "milestones": []
        },
        "5e_pqc_washing_delta": {
          "score": 0,
          "ratio": 1
        }
      },
      "total_artifacts": 0
    },
    "6_supply_chain_vendor_readiness": {
      "weight": 0.25,
      "score": 5,
      "sub_scores": {
        "6a_wallet": {
          "score": 2,
          "top3": [
            "MetaMask",
            "Rabby",
            "Startale wallet"
          ],
          "pqc_roadmap_count": 0
        },
        "6b_bridge": {
          "score": 1,
          "top3": [
            "OP Stack bridge",
            "LayerZero"
          ],
          "pqc_roadmap_count": 0
        },
        "6c_custodian": {
          "score": 1,
          "top3": [
            "Coinbase Custody",
            "Fireblocks",
            "BitGo"
          ],
          "pqc_roadmap_count": 0
        },
        "6d_rpc_hsm": {
          "score": 1,
          "top3": [
            "Sony infra",
            "Alchemy",
            "Infura"
          ],
          "pqc_roadmap_count": 0
        }
      },
      "total_artifacts": 1
    },
    "7_governance_coordination": {
      "weight": 0.1,
      "score": 30,
      "sub_scores": {
        "7a_validator_stake_distribution": {
          "score": 3,
          "note": "Single Sony sequencer."
        },
        "7b_upgrade_cadence_under_pressure": {
          "score": 8,
          "note": "New chain; limited track record."
        },
        "7c_named_coordination_lead": {
          "score": 15,
          "note": "Sony Block Solutions Labs + Startale."
        },
        "7d_adversarial_coordination_precedent": {
          "score": 4,
          "note": "None yet."
        }
      },
      "total_artifacts": 1
    }
  },
  "gates": {
    "hybrid_deployment": "FAIL",
    "evidence_reconstruction": "PASS",
    "primitive_naming": "PASS"
  },
  "caps_applied": [
    "Mosca (5a<20%)",
    "Sutor (5d=0)",
    "Preskill (<3 artifacts → ×0.5)",
    "Casado (4 tiles pqc=0)",
    "Hybrid gate FAIL → QRI cap 60"
  ],
  "qri": {
    "raw": 9,
    "after_caps": 7,
    "ci_plus_minus": 15,
    "band": 1,
    "band_name": "Unaware"
  },
  "migration_stage": 0,
  "mosca_inequality": {
    "X_signature_shelf_life_years": "5-10",
    "Y_migration_time_years_range": "10-15",
    "Z_10pct_year": 2036,
    "Z_50pct_year": 2041,
    "danger_zone_at_50pct": true
  },
  "four_scenario_grid": {
    "quantum_never": {
      "value_preserved_pct": 100,
      "privacy_preserved_pct": 100
    },
    "arrives_suddenly_pre_migration": {
      "value_preserved_pct": 3,
      "privacy_preserved_pct": 10
    },
    "arrives_slowly_post_migration": {
      "value_preserved_pct": 78,
      "privacy_preserved_pct": 70
    },
    "arrives_slowly_mid_migration": {
      "value_preserved_pct": 25,
      "privacy_preserved_pct": 30
    }
  },
  "burn_vs_rescue_policy": "undeclared",
  "pqc_washing_ratio": 1,
  "vendor_tile_summary": {
    "wallet": {
      "top3": [
        "MetaMask",
        "Rabby",
        "Startale wallet"
      ],
      "pqc_roadmap_count": 0
    },
    "bridge": {
      "top3": [
        "OP Stack bridge",
        "LayerZero"
      ],
      "pqc_roadmap_count": 0
    },
    "custodian": {
      "top3": [
        "Coinbase Custody",
        "Fireblocks",
        "BitGo"
      ],
      "pqc_roadmap_count": 0
    },
    "rpc_hsm": {
      "top3": [
        "Sony infra",
        "Alchemy",
        "Infura"
      ],
      "pqc_roadmap_count": 0
    }
  },
  "narrative_summary": "Soneium is Band 1 (Unaware). Sony's OP Stack rollup launched Jan 2025. Enterprise-backed but inherits Ethereum ECDSA + BN254 unchanged. Sony's PQC posture in its broader consumer business does not transfer to chain layer. No PQC research or roadmap.",
  "evaluator_notes": "Sony could be a fast PQC mover if compelled by Japanese CRYPTREC or similar policy — not yet. Centralized Sony-operated sequencer means rapid crypto swaps are technically feasible but politically unlikely without enterprise-sector pressure.",
  "narrative_voiced": "Sony has a serious post-quantum posture in its consumer business. None of it transferred to Soneium. The chain is an OP Stack fork on ECDSA secp256k1 and BN254, operated by a single Sony sequencer, with Coinbase Custody and Fireblocks on the custody tile. Enterprise parent, retail-grade crypto."
}