nf.evidence.loss_ledger

Loss Ledger Form (LLF)

Contract ID: nf.evidence.loss_ledger | Family: evidence | Index Status: draft | AuthorityEffect: None

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1. Executive Summary & Metadata

Loss Ledger Form (LLF) enforces structural normalization and explicit defect routing in the evidence regime.

Property	Value
Canonical ID	nf.evidence.loss_ledger
Short Name	LLF
Full Name	Loss Ledger Form
Family	evidence (Cryptographic Receipts, Dual Witnesses, Loss Ledgers, CDC Logs & Schema Totality)
Qualification	Extended Form Contract (Normal Form Contract)
Data / Math Posture	at_rest
Index Status	draft
Theory Status	proposed
Verification Status	absent
Contract Version	v0
Governance Fence	AuthorityEffect: None (certified_implies_authorized: false)

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2. Visual Architecture & Normalization Diagram

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3. Concrete Worked Example & Mechanism

Visual Transition Summary

Stage	Carrier / Operator	Concrete State / Invariant
1. Before / Candidate Input	Input Carrier (LLF Candidate)	Anomaly risk: unledgered erasure
2. Normalization / Gate	LLF Verification Gate	every lossy transformatio... (certified_implies_authorized: false)
3. After / Certified Output	Certified LLF Output	Invariant: ['ledger_id', ; 'entries', 'composed_at']

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4. The Four-Pillar Quadrilateral & Non-Claims

Every contract in simplex-normal-forms is evaluated against the Four-Pillar Quadrilateral defined in contracts/_golden_nfs/standard.yaml:

Pillar	Requirement	Contract Specification for nf.evidence.loss_ledger
Pillar I: Excludes Anomaly	Name and eliminate a specific class of data or state defects.	unledgered erasure
Pillar II: Preserves Invariant	State the structural invariant and protected skeleton preserved across transitions.	Invariant: every lossy transformation carries an append-only ledger mapping dropped attributes, precision, and approximations to authority effects Protected Skeleton: ['ledger_id', 'entries', 'composed_at']
Pillar III: Lossless Reconstruction	State the non-loss reconstruction operator (join, direct sum, pullback, or replay).	Lossless reconstruction under declared projection, direct sum, or pullback operators.
Pillar IV: Syntactic Decidability	State how conformance is decided from declared constraints without unbudgeted scans.	Decidable from declared schema and witness metadata within bounded evaluation budgets.

Explicit Non-Claims (certified_implies_authorized: false)

• does not prevent loss of data; only enforces its formal accounting

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5. Operational Verification & Terminal Routing

5.1 Required Declarations

• ledger_id
• entries
• composed_at

5.2 Required Evidence

• entry_kind (attribute_drop | precision_loss | approximation)
• entry_source
• entry_reason
• authority_effect

5.3 Validation Criteria

Criterion ID	Name	Condition
criterion	Check	ledger entries are non-empty if erased distinctions are declared in the certificate
criterion	Check	each entry must specify a valid authority effect (e.g. non_authoritative_for_repair, rounded_display_only)

5.4 Terminal Route Map

Every evaluation terminates in a declared local route mapped to a canonical terminal in standard.yaml:

Local Terminal Route	Canonical Terminal
LedgerRecorded	Preserve
LedgerMissing	BudgetUnknown
Refuse	Refuse

5.5 Declared Failure Modes

• symptom: database columns are dropped during migration without an accounting ledger, diagnosis: unledgered erasure, terminal: LedgerMissing

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6. Epistemic Claim Hygiene Quadrant

In accordance with the repository's epistemic claim discipline:

1. What it supports:
   • Supports syntactic and operational checking of nf.evidence.loss_ledger (LLF) against its declared schema, boundary constraints, and witness obligations in this model.
   • Supports deterministic terminal routing (LedgerRecorded, LedgerMissing, Refuse) when required declarations or invariants fail.
2. What it does not support:
   • Does not confer operational authority (AuthorityEffect: None, certified_implies_authorized: false).
   • Does not claim semantic truth of undeclared external processes or unverified upstream inputs beyond the declaredprotected skeleton.
3. The narrowest defensible claim:
   • Within the declared substrate at_rest, this contract enforces that unledgered erasure is either excluded under every lossy transformation carries an append-only ledger mapping dropped attributes, precision, and approximations to authority effects or routed to an explicit refusal/recovery terminal.
4. The next test needed:
   • Property-based falsification and mutation testing across boundary edge cases and composed multi-step pipelines for nf.evidence.loss_ledger.

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7. Canonical YAML Contract (contracts/nf.evidence.loss_ledger.yaml)

Click to expand full canonical YAML contract (contracts/nf.evidence.loss_ledger.yaml)

schema_version: smplx.nf.contract.v0
contract_kind: normal_form_contract
identity:
  id: nf.evidence.loss_ledger
  name: Loss Ledger Form
  short_name: LLF
  version: v0
  status: draft
  family: evidence
  theory_status: proposed
  contract_status: draft
  verification_status: absent
classification:
  hierarchy_level: form
  subject_kind:
  - certificate_packet
  data_posture: at_rest
  mathematical_posture: operational
purpose:
  excludes_anomaly: unledgered erasure
  preserves_invariant: every lossy transformation carries an append-only ledger mapping
    dropped attributes, precision, and approximations to authority effects
  protected_skeleton:
  - ledger_id
  - entries
  - composed_at
  erased_structure: []
  non_claims:
  - does not prevent loss of data; only enforces its formal accounting
declarations_required:
- ledger_id
- entries
- composed_at
evidence_required:
- entry_kind (attribute_drop | precision_loss | approximation)
- entry_source
- entry_reason
- authority_effect
validation_criteria:
- ledger entries are non-empty if erased distinctions are declared in the certificate
- each entry must specify a valid authority effect (e.g. non_authoritative_for_repair,
  rounded_display_only)
proof_obligations: []
terminal_routes:
- LedgerRecorded
- LedgerMissing
- Refuse
certification:
  certificate_required: false
  certificate_kind: null
  obstruction_class_required: false
  loss_ledger_required: false
  verifier_required: true
authorization:
  authorized_by: null
  certified_implies_authorized: false
failure_modes:
- symptom: database columns are dropped during migration without an accounting ledger
  diagnosis: unledgered erasure
  terminal: LedgerMissing
references:
- ../1_normal_forms.md
- ../nf.coda.mur.transport.yaml
terminal_route_map:
  LedgerRecorded: Preserve
  LedgerMissing: BudgetUnknown
  Refuse: Refuse
definition:
  source: coda_all_universe/mssn_sn_tower/definitions.md
  formal_statement: unledgered erasure. every lossy transformation carries an append-only
    ledger mapping dropped attributes, precision, and approximations to authority
    effects
  quadrilateral:
    qualifies_as_true_normal_form: false
    qualification_gap: reconstruction_is_not_a_relational_project_join
    anomaly_exclusion: unledgered erasure
    lossless_join:
      status: declared_reconstruction
      statement: every lossy transformation carries an append-only ledger mapping
        dropped attributes, precision, and approximations to authority effects
    dependency_preservation:
      status: declared_with_the_invariant
      statement: The preserved invariant stays on the declared schema. This form does
        not state a functional-dependency projection of a flat relvar decomposition.
    syntactic_decision:
      status: declaration_decidable
      statement: The check reads the declared constraints and validation criteria.
        One unrecorded runtime image is not the decider.
schema_ref: ./normal_form_contract_schema.yaml