{
  "chain_slug": "xai",
  "name": "Xai",
  "scorecard_profile": "rollup-L2",
  "evaluated_at": "2026-04-17",
  "evaluator": "layerqu-v2-scoring-agent-5",
  "v1_reference": "chainscreen-v1-archive",
  "dimensions": {
    "1_cryptographic_exposure": {
      "weight": 0.15,
      "score": 18,
      "sub_scores": {
        "1a_primitive_inventory": {
          "score": 8,
          "primitives_named": [
            "ECDSA secp256k1 (Arbitrum Orbit)",
            "Keccak-256",
            "AnyTrust data availability committee signatures"
          ],
          "evidence": [
            "v1:chainscreen-v1-archive/data/chains/xai.json"
          ],
          "note": "Arbitrum Orbit L3 with AnyTrust DA mode; Sentry Node network adds verification layer."
        },
        "1b_shor_grover_pq_tag": {
          "score": 4,
          "tags": {
            "ECDSA secp256k1": "Shor-break",
            "AnyTrust DAC sigs": "Shor-break"
          },
          "evidence": []
        },
        "1c_algorithm_family_diversity": {
          "score": 2,
          "families_represented": 0,
          "families": [],
          "note": "No PQ family."
        },
        "1d_nist_security_category": {
          "score": 2,
          "mappings": {
            "ECDSA": "128-bit classical"
          },
          "evidence": []
        },
        "1e_implementation_quality": {
          "score": 2,
          "formal_verification": "inherits Arbitrum Nitro audits",
          "constant_time": "standard",
          "libraries": [
            "nitro"
          ],
          "evidence": []
        }
      },
      "total_artifacts": 1
    },
    "2_hndl_exposure": {
      "weight": 0.1,
      "score": 18,
      "sub_scores": {
        "2a_active_key_exposure": {
          "score": 5,
          "note": "Gaming L3; per-game active keys."
        },
        "2b_cold_key_exposure": {
          "score": 5,
          "note": "Young chain (2024); small dormant."
        },
        "2c_signature_longterm_validity": {
          "score": 4,
          "note": "Classical ECDSA."
        },
        "2d_encryption_confidentiality": {
          "score": 4,
          "note": "TLS."
        }
      },
      "total_artifacts": 1
    },
    "3_metadata_privacy_exposure": {
      "weight": 0.1,
      "score": 18,
      "sub_scores": {
        "3a_tx_graph_visibility": {
          "score": 4,
          "note": "AnyTrust DA mode: data available off-chain via DAC, reducing visibility but also reducing trust assumptions."
        },
        "3b_rpc_mempool_concentration": {
          "score": 5,
          "note": "Offchain Labs + Xai Foundation sequencer."
        },
        "3c_cross_chain_bridge_correlation": {
          "score": 5,
          "note": "Arbitrum One<->Xai bridge."
        },
        "3d_retroactive_deanon_risk": {
          "score": 4,
          "note": "No privacy layer."
        }
      },
      "total_artifacts": 1
    },
    "4_migration_architecture": {
      "weight": 0.18,
      "score": 32,
      "sub_scores": {
        "4a_crypto_agility": {
          "score": 9,
          "note": "Inherits Arbitrum Orbit path."
        },
        "4b_account_abstraction_key_rotation": {
          "score": 10,
          "note": "ERC-4337 available."
        },
        "4c_hard_fork_track_record": {
          "score": 7,
          "note": "Brief Nitro-inherited track record."
        },
        "4d_hybrid_deployment_readiness": {
          "score": 6,
          "note": "No PQ roadmap."
        }
      },
      "total_artifacts": 1
    },
    "5_deployment_execution": {
      "weight": 0.22,
      "score": 3,
      "sub_scores": {
        "5a_mainnet_pqc_pct": {
          "score": 0,
          "mainnet_pqc_pct": 0,
          "evidence": [],
          "note": "Zero PQC."
        },
        "5b_pqc_code_in_client": {
          "score": 1,
          "note": "No PQ code."
        },
        "5c_validator_pqc_adoption": {
          "score": 0,
          "note": "~75K Sentry Nodes (verification layer) but not signers; sequencer centralized."
        },
        "5d_published_milestones_count": {
          "score": 1,
          "count": 0,
          "note": "No PQ milestones."
        },
        "5e_pqc_washing_delta": {
          "score": 1,
          "ratio": 0,
          "note": "No claims."
        }
      },
      "total_artifacts": 1
    },
    "6_supply_chain_vendor_readiness": {
      "weight": 0.2,
      "score": 5,
      "sub_scores": {
        "6a_wallet": {
          "score": 1,
          "top3": [
            "MetaMask",
            "Rabby",
            "Xai native"
          ],
          "pqc_roadmap_count": 0,
          "evidence": []
        },
        "6b_bridge": {
          "score": 1,
          "top3": [
            "Arbitrum canonical",
            "Axelar",
            "Stargate"
          ],
          "pqc_roadmap_count": 0,
          "evidence": []
        },
        "6c_custodian": {
          "score": 2,
          "top3": [
            "Coinbase Custody",
            "BitGo",
            "Anchorage"
          ],
          "pqc_roadmap_count": 0,
          "evidence": []
        },
        "6d_rpc_hsm": {
          "score": 1,
          "top3": [
            "Offchain Labs RPC",
            "Alchemy",
            "QuickNode"
          ],
          "pqc_roadmap_count": 0,
          "evidence": []
        }
      },
      "total_artifacts": 1
    },
    "7_governance_coordination": {
      "weight": 0.05,
      "score": 28,
      "sub_scores": {
        "7a_validator_stake_distribution": {
          "score": 5,
          "note": "Sentry Nodes decentralized (~75K) but sequencer centralized."
        },
        "7b_upgrade_cadence_under_pressure": {
          "score": 7,
          "note": "Orbit-inherited."
        },
        "7c_named_coordination_lead": {
          "score": 9,
          "note": "Named: Xai Foundation, Offchain Labs."
        },
        "7d_adversarial_coordination_precedent": {
          "score": 7,
          "note": "No precedent."
        }
      },
      "total_artifacts": 1
    }
  },
  "gates": {
    "hybrid_deployment": "FAIL",
    "evidence_reconstruction": "PASS",
    "primitive_naming": "PASS"
  },
  "caps_applied": [
    "mosca_cap_60 (5a=0)",
    "sutor_cap_50"
  ],
  "qri": {
    "raw": 13,
    "after_caps": 11,
    "ci_plus_minus": 5,
    "band": 1,
    "band_name": "Aware-Only"
  },
  "migration_stage": 0,
  "mosca_inequality": {
    "X_signature_shelf_life_years": "3-8",
    "Y_migration_time_years_range": "5-10 (Arbitrum-dependent)",
    "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": 10,
      "privacy_preserved_pct": 8
    },
    "arrives_slowly_post_migration": {
      "value_preserved_pct": 50,
      "privacy_preserved_pct": 25
    },
    "arrives_slowly_mid_migration": {
      "value_preserved_pct": 25,
      "privacy_preserved_pct": 12
    }
  },
  "burn_vs_rescue_policy": "none-announced",
  "pqc_washing_ratio": 0,
  "vendor_tile_summary": {
    "wallet": {
      "top3": [
        "MetaMask",
        "Rabby",
        "Xai native"
      ],
      "pqc_roadmap_count": 0
    },
    "bridge": {
      "top3": [
        "Arbitrum canonical",
        "Axelar",
        "Stargate"
      ],
      "pqc_roadmap_count": 0
    },
    "custodian": {
      "top3": [
        "Coinbase Custody",
        "BitGo",
        "Anchorage"
      ],
      "pqc_roadmap_count": 0
    },
    "rpc_hsm": {
      "top3": [
        "Offchain Labs RPC",
        "Alchemy",
        "QuickNode"
      ],
      "pqc_roadmap_count": 0
    }
  },
  "narrative_summary": "Xai is an Arbitrum Orbit L3 for Web3 gaming with AnyTrust data availability and ~75K Sentry Nodes. Inherits Arbitrum crypto; no independent PQ work. AnyTrust DAC adds a second signature set (also classical) on top of inherited ECDSA. Not a standalone PQ story.",
  "evaluator_notes": "Stage 0. Sentry Node count is a governance signal but not PQ-relevant without independent validation scheme.",
  "narrative_voiced": "Xai is an Arbitrum Orbit gaming L3 with 75,000 Sentry Nodes that sound decentralized and a sequencer that is not. The AnyTrust DAC adds a second classical signature set on top of inherited classical ECDSA, which is twice the work to migrate and none of the PQ benefit."
}