Appendix F

Replay & Verification Specification

This appendix specifies how Constitutional Execution Infrastructure reconstructs and verifies governed execution from immutable event history. Replay is defined as a deterministic verification process rather than a secondary execution path.

Replay is not repetition. Replay is verification that the recorded history remains internally consistent and produces the same constitutional outcome.

1. Objectives

• Reconstruct historical execution deterministically.
• Verify ledger integrity.
• Detect inconsistencies or missing events.
• Rebuild projections from immutable history.
• Support operational audit and forensic analysis.

2. Replay Lifecycle

Select Replay Scope
        ↓
Load Ledger Events
        ↓
Verify Integrity
        ↓
Reconstruct State
        ↓
Re-evaluate Transitions
        ↓
Compare Expected Outcome
        ↓
Generate Replay Report

3. Deterministic Replay Requirements

4. Verification Workflow

Ledger
  ↓
Integrity Check
  ↓
Sequence Validation
  ↓
State Reconstruction
  ↓
Decision Comparison
  ↓
Verification Result

5. Drift Detection

Replay should identify conditions where reconstructed execution differs from the expected constitutional history. Typical causes include incomplete event history, incompatible policy versions, corrupted records, or unsupported runtime changes.

6. Projection Rebuild

• Read immutable events.
• Reconstruct canonical state.
• Generate updated projections.
• Validate projection consistency.
• Publish rebuilt read models.

7. Replay Result

8. Conformance

• A conforming replay engine MUST preserve event order.
• Replay MUST NOT modify immutable ledger records.
• Verification output SHOULD be independently reviewable.
• Projection rebuilding SHOULD be repeatable.

Appendix Summary

The Replay & Verification Specification defines how CEI implementations validate historical execution. Together with the runtime, ledger, and governance specifications, replay provides the evidence needed to demonstrate that consequential decisions remain explainable, reproducible, and auditable over time.

Next: Appendix G — REST API & SDK Specification.