{
  "chain_slug": "tezos",
  "name": "Tezos",
  "scorecard_profile": "L1",
  "evaluated_at": "2026-04-17",
  "evaluator": "layerqu-v2-scoring-agent-5",
  "v1_reference": "chainscreen-v1-archive",
  "dimensions": {
    "1_cryptographic_exposure": {
      "weight": 0.15,
      "score": 34,
      "sub_scores": {
        "1a_primitive_inventory": {
          "score": 13,
          "primitives_named": [
            "Ed25519 (tz1)",
            "ECDSA secp256k1 (tz2)",
            "ECDSA P-256 (tz3)",
            "BLS12-381 (tz4)",
            "SHA-256/Blake2b (hashing)"
          ],
          "evidence": [
            "v1:chainscreen-v1-archive/data/chains/tezos.json"
          ],
          "note": "Four signature curves natively supported (tz1/tz2/tz3/tz4). Among the broadest multi-curve support on any L1."
        },
        "1b_shor_grover_pq_tag": {
          "score": 8,
          "tags": {
            "Ed25519": "Shor-break",
            "ECDSA secp256k1": "Shor-break",
            "ECDSA P-256": "Shor-break",
            "BLS12-381": "Shor-break"
          },
          "evidence": []
        },
        "1c_algorithm_family_diversity": {
          "score": 5,
          "families_represented": 0,
          "families": [],
          "note": "Multiple EC families but all classical."
        },
        "1d_nist_security_category": {
          "score": 4,
          "mappings": {
            "P-256": "128-bit classical"
          },
          "evidence": []
        },
        "1e_implementation_quality": {
          "score": 4,
          "formal_verification": "Protocol written in OCaml; Michelson formally specified; multiple shell implementations",
          "constant_time": "standard",
          "libraries": [
            "octez",
            "tezedge"
          ],
          "evidence": []
        }
      },
      "total_artifacts": 1
    },
    "2_hndl_exposure": {
      "weight": 0.1,
      "score": 28,
      "sub_scores": {
        "2a_active_key_exposure": {
          "score": 7,
          "note": "Pubkeys typically exposed; reveal operation broadcasts pubkey on first tx."
        },
        "2b_cold_key_exposure": {
          "score": 7,
          "note": "~7 years old. Dormant holders from 2017 ICO era."
        },
        "2c_signature_longterm_validity": {
          "score": 7,
          "note": "All four curves classical; historical sigs Shor-forgeable."
        },
        "2d_encryption_confidentiality": {
          "score": 7,
          "note": "Standard TLS."
        }
      },
      "total_artifacts": 1
    },
    "3_metadata_privacy_exposure": {
      "weight": 0.13,
      "score": 28,
      "sub_scores": {
        "3a_tx_graph_visibility": {
          "score": 7,
          "note": "Transparent ledger; Sapling-on-Tezos was proposed, limited adoption."
        },
        "3b_rpc_mempool_concentration": {
          "score": 7,
          "note": "Nomadic Labs, Marigold, TzKT, TzStats RPCs."
        },
        "3c_cross_chain_bridge_correlation": {
          "score": 7,
          "note": "Limited bridge activity; correlation risk modest."
        },
        "3d_retroactive_deanon_risk": {
          "score": 7,
          "note": "Sapling usage limited; transparent risk dominates."
        }
      },
      "total_artifacts": 1
    },
    "4_migration_architecture": {
      "weight": 0.1,
      "score": 72,
      "sub_scores": {
        "4a_crypto_agility": {
          "score": 22,
          "note": "Self-amendment: 19 on-chain protocol upgrades executed without hard forks. Signature-scheme switch is a protocol-amendment vote, not a contentious fork. Structurally the strongest migration substrate in the evaluated L1 set."
        },
        "4b_account_abstraction_key_rotation": {
          "score": 14,
          "note": "No full AA, but reveal/set-delegate operations and 4-curve selection give limited per-account flexibility."
        },
        "4c_hard_fork_track_record": {
          "score": 20,
          "note": "19 successful on-chain amendments, zero contested hard forks. Unique governance asset."
        },
        "4d_hybrid_deployment_readiness": {
          "score": 16,
          "note": "Forum discussions on PQ (2024-2025) flagged by Nomadic Labs; no amendment shipped. Path exists but not exercised."
        }
      },
      "total_artifacts": 1
    },
    "5_deployment_execution": {
      "weight": 0.22,
      "score": 14,
      "sub_scores": {
        "5a_mainnet_pqc_pct": {
          "score": 0,
          "mainnet_pqc_pct": 0,
          "evidence": [],
          "note": "Zero PQC on mainnet. Mosca cap triggers."
        },
        "5b_pqc_code_in_client": {
          "score": 3,
          "note": "No PQC in octez mainnet; research-grade discussions only."
        },
        "5c_validator_pqc_adoption": {
          "score": 0,
          "note": "Zero PQ bakers."
        },
        "5d_published_milestones_count": {
          "score": 7,
          "count": 2,
          "note": "Milestones: (1) forum discussion of PQ signature support, (2) tz4 BLS12-381 added (not PQ but shows curve-agility)."
        },
        "5e_pqc_washing_delta": {
          "score": 4,
          "ratio": 0.5,
          "note": "Low: honest posture."
        }
      },
      "total_artifacts": 1
    },
    "6_supply_chain_vendor_readiness": {
      "weight": 0.22,
      "score": 10,
      "sub_scores": {
        "6a_wallet": {
          "score": 3,
          "top3": [
            "Temple",
            "Kukai",
            "Ledger"
          ],
          "pqc_roadmap_count": 0,
          "evidence": []
        },
        "6b_bridge": {
          "score": 2,
          "top3": [
            "Wrap",
            "Plenty",
            "Allbridge"
          ],
          "pqc_roadmap_count": 0,
          "evidence": []
        },
        "6c_custodian": {
          "score": 3,
          "top3": [
            "Coinbase Custody",
            "Kiln",
            "Ledger Enterprise"
          ],
          "pqc_roadmap_count": 0,
          "evidence": []
        },
        "6d_rpc_hsm": {
          "score": 2,
          "top3": [
            "Nomadic Labs RPC",
            "TzKT",
            "Blockdaemon"
          ],
          "pqc_roadmap_count": 0,
          "evidence": []
        }
      },
      "total_artifacts": 1
    },
    "7_governance_coordination": {
      "weight": 0.08,
      "score": 78,
      "sub_scores": {
        "7a_validator_stake_distribution": {
          "score": 18,
          "note": "~400+ bakers; Coinbase Cloud top staker but distribution reasonable."
        },
        "7b_upgrade_cadence_under_pressure": {
          "score": 22,
          "note": "19 on-chain amendments executed; cadence predictable. Strongest in set."
        },
        "7c_named_coordination_lead": {
          "score": 20,
          "note": "Named: Nomadic Labs, Marigold, Trilitech, Functori, TF (Tezos Foundation)."
        },
        "7d_adversarial_coordination_precedent": {
          "score": 18,
          "note": "Historical governance dispute with founders resolved via TF. On-chain vote is the coordination artifact."
        }
      },
      "total_artifacts": 1
    }
  },
  "gates": {
    "hybrid_deployment": "FAIL (no shipped hybrid)",
    "evidence_reconstruction": "PASS",
    "primitive_naming": "PASS"
  },
  "caps_applied": [
    "mosca_cap_60 (5a=0)",
    "sutor_cap_50 (only 2 milestones)"
  ],
  "qri": {
    "raw": 33,
    "after_caps": 30,
    "ci_plus_minus": 6,
    "band": 3,
    "band_name": "Preparing"
  },
  "migration_stage": 1,
  "mosca_inequality": {
    "X_signature_shelf_life_years": "4-12",
    "Y_migration_time_years_range": "2-4 (self-amendment is faster than HF coordination)",
    "Z_10pct_year": 2036,
    "Z_50pct_year": 2041,
    "danger_zone_at_50pct": false
  },
  "four_scenario_grid": {
    "quantum_never": {
      "value_preserved_pct": 100,
      "privacy_preserved_pct": 100
    },
    "arrives_suddenly_pre_migration": {
      "value_preserved_pct": 18,
      "privacy_preserved_pct": 12
    },
    "arrives_slowly_post_migration": {
      "value_preserved_pct": 75,
      "privacy_preserved_pct": 40
    },
    "arrives_slowly_mid_migration": {
      "value_preserved_pct": 50,
      "privacy_preserved_pct": 25
    }
  },
  "burn_vs_rescue_policy": "none-ratified; self-amendment substrate supports rescue path",
  "pqc_washing_ratio": 0.5,
  "vendor_tile_summary": {
    "wallet": {
      "top3": [
        "Temple",
        "Kukai",
        "Ledger"
      ],
      "pqc_roadmap_count": 0
    },
    "bridge": {
      "top3": [
        "Wrap",
        "Plenty",
        "Allbridge"
      ],
      "pqc_roadmap_count": 0
    },
    "custodian": {
      "top3": [
        "Coinbase Custody",
        "Kiln",
        "Ledger Enterprise"
      ],
      "pqc_roadmap_count": 0
    },
    "rpc_hsm": {
      "top3": [
        "Nomadic Labs RPC",
        "TzKT",
        "Blockdaemon"
      ],
      "pqc_roadmap_count": 0
    }
  },
  "narrative_summary": "Tezos has the strongest governance substrate for PQ migration in the evaluated set: 19 successful on-chain protocol amendments, zero contested hard forks. Signature-scheme change is a ballot, not a battle. Four native curves (tz1/tz2/tz3/tz4) show curve-agility precedent. Deployment gap: no amendment shipped with PQ scheme yet. If any L1 can add ML-DSA smoothly, it is Tezos.",
  "evaluator_notes": "Stage 1. Governance is the standout asset (dim 7 = 78). Migration Architecture (72) = second-highest in batch after Starknet. Deployment Execution low (14) holds QRI back. Hybrid gate FAIL because no code; research-grade discussion only.",
  "narrative_voiced": "Tezos is the chain where a signature-scheme change is a ballot, not a battle. Nineteen on-chain amendments have shipped with zero contested forks, and four native curves (tz1/tz2/tz3/tz4) show the substrate can accept new schemes. The interesting question is why, with the best governance in the set, ML-DSA has not been proposed yet."
}