{
  "chain_slug": "stellar",
  "name": "Stellar",
  "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": 22,
      "sub_scores": {
        "1a_primitive_inventory": {
          "score": 10,
          "primitives_named": [
            "Ed25519 (account signatures)",
            "SHA-256 (hashing)",
            "SCP (Stellar Consensus Protocol, quorum-based)"
          ],
          "evidence": [
            "v1:chainscreen-v1-archive/data/chains/stellar.json"
          ],
          "note": "Uniform Ed25519 signature scheme across accounts."
        },
        "1b_shor_grover_pq_tag": {
          "score": 6,
          "tags": {
            "Ed25519": "Shor-break (Curve25519)",
            "SHA-256": "Grover-weaken-128bit"
          },
          "evidence": []
        },
        "1c_algorithm_family_diversity": {
          "score": 2,
          "families_represented": 0,
          "families": [],
          "note": "Zero PQ family deployed. Single-family classical crypto."
        },
        "1d_nist_security_category": {
          "score": 2,
          "mappings": {
            "Ed25519": "128-bit classical (0-bit PQ)"
          },
          "evidence": [],
          "note": "No NIST PQC category deployed."
        },
        "1e_implementation_quality": {
          "score": 2,
          "formal_verification": "Ed25519 standard audited; stellar-core tested",
          "constant_time": "standard",
          "libraries": [
            "stellar-core (C++)",
            "soroban-rs (Rust)"
          ],
          "evidence": []
        }
      },
      "total_artifacts": 1
    },
    "2_hndl_exposure": {
      "weight": 0.1,
      "score": 22,
      "sub_scores": {
        "2a_active_key_exposure": {
          "score": 6,
          "note": "Ed25519 pubkeys exposed on first tx. Large exchange-held balances via federated hot wallets increase active surface."
        },
        "2b_cold_key_exposure": {
          "score": 5,
          "note": "~10 years old. SDF held 42.5% (later reduced) represents institutional dormant exposure."
        },
        "2c_signature_longterm_validity": {
          "score": 5,
          "note": "All historical Ed25519 signatures Shor-forgeable; no rotation primitive."
        },
        "2d_encryption_confidentiality": {
          "score": 6,
          "note": "Standard TLS; no PQC KEM in Horizon/peer protocol."
        }
      },
      "total_artifacts": 1
    },
    "3_metadata_privacy_exposure": {
      "weight": 0.13,
      "score": 28,
      "sub_scores": {
        "3a_tx_graph_visibility": {
          "score": 6,
          "note": "Fully transparent ledger; payment memos often contain user identifiers (remittance use case)."
        },
        "3b_rpc_mempool_concentration": {
          "score": 8,
          "note": "Horizon API concentration at SDF and a few providers."
        },
        "3c_cross_chain_bridge_correlation": {
          "score": 7,
          "note": "USDC issuance and anchor networks tie Stellar addresses to off-chain KYC."
        },
        "3d_retroactive_deanon_risk": {
          "score": 7,
          "note": "No shielded pools; retroactive risk is transparent-ledger inference."
        }
      },
      "total_artifacts": 1
    },
    "4_migration_architecture": {
      "weight": 0.1,
      "score": 32,
      "sub_scores": {
        "4a_crypto_agility": {
          "score": 10,
          "note": "Protocol version upgrades via SCP; no in-protocol signature-scheme switch primitive. Muxed accounts and Soroban are additive, not agility."
        },
        "4b_account_abstraction_key_rotation": {
          "score": 8,
          "note": "No AA. Multisig and weighted thresholds exist; Soroban smart contracts possible but not used as accounts."
        },
        "4c_hard_fork_track_record": {
          "score": 8,
          "note": "Regular protocol upgrades (20+). Predictable cadence; SDF-coordinated."
        },
        "4d_hybrid_deployment_readiness": {
          "score": 6,
          "note": "No published hybrid roadmap; no PQ signature-scheme preparation observed."
        }
      },
      "total_artifacts": 1
    },
    "5_deployment_execution": {
      "weight": 0.22,
      "score": 5,
      "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": 1,
          "note": "No PQC code in stellar-core; no PQ research branch observed."
        },
        "5c_validator_pqc_adoption": {
          "score": 0,
          "note": "Zero PQ validators across SCP quorum."
        },
        "5d_published_milestones_count": {
          "score": 2,
          "count": 0,
          "note": "No published PQ milestones from SDF."
        },
        "5e_pqc_washing_delta": {
          "score": 2,
          "ratio": 0,
          "note": "No announcements; no washing."
        }
      },
      "total_artifacts": 1
    },
    "6_supply_chain_vendor_readiness": {
      "weight": 0.22,
      "score": 8,
      "sub_scores": {
        "6a_wallet": {
          "score": 2,
          "top3": [
            "Freighter",
            "Lobstr",
            "Ledger"
          ],
          "pqc_roadmap_count": 0,
          "evidence": []
        },
        "6b_bridge": {
          "score": 2,
          "top3": [
            "Allbridge",
            "Wormhole",
            "SPL bridges"
          ],
          "pqc_roadmap_count": 0,
          "evidence": []
        },
        "6c_custodian": {
          "score": 2,
          "top3": [
            "Coinbase Custody",
            "BitGo",
            "Anchorage"
          ],
          "pqc_roadmap_count": 0,
          "evidence": []
        },
        "6d_rpc_hsm": {
          "score": 2,
          "top3": [
            "Horizon (SDF)",
            "Blockdaemon",
            "QuickNode"
          ],
          "pqc_roadmap_count": 0,
          "evidence": []
        }
      },
      "total_artifacts": 1
    },
    "7_governance_coordination": {
      "weight": 0.08,
      "score": 42,
      "sub_scores": {
        "7a_validator_stake_distribution": {
          "score": 8,
          "note": "SCP quorum slices; Tier-1 nodes concentrated among SDF, SatoshiPay, LOBSTR, COINQVEST, Blockdaemon."
        },
        "7b_upgrade_cadence_under_pressure": {
          "score": 12,
          "note": "Regular protocol version bumps; SDF coordinates."
        },
        "7c_named_coordination_lead": {
          "score": 12,
          "note": "Named: Stellar Development Foundation (SDF), Denelle Dixon. Single dominant foundation."
        },
        "7d_adversarial_coordination_precedent": {
          "score": 10,
          "note": "No cryptographic emergency precedent; 2019 inflation event handled."
        }
      },
      "total_artifacts": 1
    }
  },
  "gates": {
    "hybrid_deployment": "FAIL (no hybrid plan)",
    "evidence_reconstruction": "PASS",
    "primitive_naming": "PASS"
  },
  "caps_applied": [
    "mosca_cap_60 (5a=0)",
    "sutor_cap_50 (zero milestones)"
  ],
  "qri": {
    "raw": 16,
    "after_caps": 14,
    "ci_plus_minus": 5,
    "band": 1,
    "band_name": "Aware-Only"
  },
  "migration_stage": 0,
  "mosca_inequality": {
    "X_signature_shelf_life_years": "5-15 (Ed25519 static, no rotation)",
    "Y_migration_time_years_range": "5-10 (SDF-led protocol upgrade required)",
    "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": 10
    },
    "arrives_slowly_post_migration": {
      "value_preserved_pct": 55,
      "privacy_preserved_pct": 30
    },
    "arrives_slowly_mid_migration": {
      "value_preserved_pct": 30,
      "privacy_preserved_pct": 15
    }
  },
  "burn_vs_rescue_policy": "none-announced",
  "pqc_washing_ratio": 0,
  "vendor_tile_summary": {
    "wallet": {
      "top3": [
        "Freighter",
        "Lobstr",
        "Ledger"
      ],
      "pqc_roadmap_count": 0
    },
    "bridge": {
      "top3": [
        "Allbridge",
        "Wormhole",
        "SPL bridges"
      ],
      "pqc_roadmap_count": 0
    },
    "custodian": {
      "top3": [
        "Coinbase Custody",
        "BitGo",
        "Anchorage"
      ],
      "pqc_roadmap_count": 0
    },
    "rpc_hsm": {
      "top3": [
        "Horizon (SDF)",
        "Blockdaemon",
        "QuickNode"
      ],
      "pqc_roadmap_count": 0
    }
  },
  "narrative_summary": "Stellar is a classical-crypto L1 with no published PQC program. Ed25519 across accounts, SHA-256 hashing, SCP consensus. SDF is the coordination authority and has executed 20+ protocol upgrades, so migration capacity exists — but no PQ roadmap, no research output, no hybrid plan. Remittance focus means long-lived classical signatures in dormant accounts.",
  "evaluator_notes": "Stage 0. Low washing ratio (honest silence). Gate failure: no hybrid plan. SDF governance coherence is the only positive signal. Typical L1 baseline.",
  "narrative_voiced": "Stellar has the coordination to migrate and nothing to migrate to. The Stellar Development Foundation has shipped over 20 protocol upgrades and controls SCP cadence, but there is no PQ roadmap, no research output, and no hybrid plan. Remittance accounts hold long-lived Ed25519 signatures in dormant keys."
}